Entries |
Document | Title | Date |
20080232427 | TEMPERATURE SENSITIVE LABEL FOR DETECTING TEMPERATURE CHANGES TO A TEMPERATURE SENSITIVE ITEM - A temperature sensitive label may be affixed to a temperature sensitive item. The temperature sensitive label conveys when the item has reached a tripping temperature. The tripping temperature may be a temperature at which the item is compromised. To convey this, the label changes properties and functions with a message to convey that the item has been exposed to the tripping temperature. For example, the label may reveal, block, or alter a message that conveys whether the item has been exposed to the tripping temperature. The message may be part of the label or separate from the label. | 09-25-2008 |
20080267257 | Method and System for Detecting Substrate Temperature in a Track Lithography Tool - A device for measuring a temperature of a semiconductor wafer comprises a structure adapted to support the semiconductor wafer. The structure has an upper end and a lower end. The upper end contacts the wafer. A photoluminescent material is adapted to emit an emission light energy in response to the temperature of the wafer. A light source is adapted to emit an excitation light energy. The light source is optically coupled to the photoluminescent material. A detector is adapted to measure the emission light energy emitted from the photoluminescent material so as to determine the temperature of the wafer. In specific embodiments, the photoluminescent material may be positioned near the upper end of the structure to measure the temperature of the wafer while the wafer is supported with the structure. The structure may comprise a proximity pin and an optically transparent material. The light source and the detector may be positioned near the lower end of the structure and optically coupled to the photoluminescent material. | 10-30-2008 |
20090010305 | Temperature Indicator - A temperature indicator ( | 01-08-2009 |
20090010306 | Temperature Sensitive Paint for an Extended Temperature Range - A temperature sensitive paint comprises a binder for forming a polymer matrix, a transition metal complex embedded in the binder and displaying a temperature dependent fluorescence, the fluorescence of the transition metal complex showing a maximum relative temperature sensitivity per Kelvin at a first temperature, and a rare earth complex also embedded in the binder and displaying a temperature dependent fluorescence, the fluorescence of the rare earth complex showing a maximum relative temperature sensitivity per Kelvin at a second temperature. The second temperature is higher than the first temperature by 50 to 150 Kelvin so that the overall temperature range covered by both complexes as temperature probes is extended. | 01-08-2009 |
20090016407 | Temperature-measuring member, temperature-measuring device, and method for measuring temperature - The surface density of projections formed on a thin metal film of a temperature-measuring member having the metal film having been subjected to a temperature profile is calculated with a number-calculating section according to image data fed into an arithmetic processing unit through an optical microscope, CCD camera, and I/O board. The maximum temperature of the object is determined with the temperature-calculating unit according to the surface density and data on the maximum temperature and surface density previously stored in memory. Furthermore, a temperature-measuring member constituted by a thin aluminum film arranged on a substrate is used. A reduction in the reflectivity of the film due to projections formed on the film surface according to a temperature profile to which the member has been subjected is measured. The maximum temperature in the temperature profile is estimated according to the reduction in reflectivity. | 01-15-2009 |
20090022204 | METHOD FOR TEMPERATURE MEASUREMENT IN A MICROFLUID CHANNEL OF A MICROFLUID DEVICE - The invention relates to a method for temperature measurement in a microfluid channel of a microfluid device. According to the invention, a method for temperature measurement in a microfluid channel of a microfluid device, by means of which the temperature maybe simply measured with reliable accuracy, maybe achieved, whereby a volume element of the microfluid channel in which the temperature is to be measured is irradiated with a light source, elastically-scattered and other undesired light is separated off from the light with Raman scattering in the volume chamber, the Raman scattered light is recorded by a recording means, the recorded Raman scattered light is converted into Raman signals and the temperature in the volume element determined from the Raman signals. | 01-22-2009 |
20090022205 | Temperature probes having a thermally isolated tip - Temperature probes for measuring the temperature of objects are disclosed. The temperature probes include a housing and a tip in thermal contact with an end of the housing. The tip is adapted to contact a surface of the object whose temperature is to be measured by the temperature probe. A portion of the housing in contact with the tip has a high thermal resistance effective to thermally isolate the tip from an adjacent portion of the housing. A sensor is located inside of the housing and adapted to measure the temperature of the tip. | 01-22-2009 |
20090059996 | Optical Fiber Temperature Distribution Measuring Apparatus, Method for Measuring Optical Fiber Temperature Distribution, and Optical Fiber Temperature Distribution Measuring System - An optical fiber temperature distribution measuring apparatus and a method for measuring optical fiber temperature distribution, provided with a light source for inputting a pulse light to an optical fiber to be measured, a signal detecting unit for detecting a received light intensity of a predetermined light included in a backscattering light generated by an input of the pulse light in the optical fiber to be measured, and a signal processing unit for calculating a value corresponding to a variation of the received light intensity due to a hydrogen molecular absorption of the optical fiber to be measured based on the received light intensity of the predetermined light, to compensate the received light intensity of the predetermined light corresponding to a temperature of the optical fiber to be measured based on the value. | 03-05-2009 |
20090092173 | METHOD FOR MONITORING THE STATE OF A TUBE FOR A COATING IN A SYSTEM OF PIPES OR DUCTS - A method for monitoring a status of a sleeve for lining a system of pipes or conduits, the sleeve being impregnated with a curable resin, includes the steps of providing the sleeve, disposing at least one fiber optic sensor in thermally conductive contact with the sleeve, and generating, using the at least one fiber optic sensor, a positionally resolved thermographic image representative of a temperature of the sleeve as a function of position and time | 04-09-2009 |
20090122832 | MEASUREMENT, COATING AND MONITORING SYSTEM AND METHOD - A measurement system for and method of measuring thicknesses of coatings as applied to objects and a coating system and method for coating objects, in particular three-dimensional objects, with coatings, in particular thermal barrier coatings (TBCs), and a monitoring system for and method of monitoring a state of a thermal barrier coating (TBC) as applied to an object which is exposed to a high-temperature environment, and a TBC for use with the same. | 05-14-2009 |
20090135880 | TEMPERATURE SENSOR PROBE AND MANUFACTURING METHOD OF THE SAME - To provide a temperature sensor probe that can conduct stable measurements, and the manufacturing method of the same. The temperature sensor probe related to the present invention provides: a fluorescent material that is a mixture of a fluorescent substance and a transparent material; a thermosensitive part having a concave part in which the fluorescent material is arranged; a waveguide route rod that propagates excitation light, which is irradiated on the fluorescent material, and fluorescent light, which is produced by the fluorescent substance; and a protective tube that covers the side surfaces of the waveguide route rod. Then, the fluorescent material is affixed to the tip of the waveguide route rod using the transparent material, and the waveguide route rod bites into the fluorescent material. | 05-28-2009 |
20090135881 | TEMPERATURE SENSOR PROBE - To provide a temperature sensor probe that can take stable measurements, and a manufacturing method thereof. The temperature sensor probe related to the present invention is a temperature sensor probe for measuring temperature using a fluorescent substance that changes fluorescent characteristics depending on temperature. Then, a powdered fluorescent substance, a guide wave route member that propagates excitation light, which is irradiated on the fluorescent substance, and fluorescent light, which is produced by the fluorescent substance, are provided. Further, the particle size of the powdered fluorescent substance is confined to the range of 60 to 100 μm. | 05-28-2009 |
20090161724 | Determining the Temperature of Silicon at High Temperatures - The temperature of an object such as a semiconductor wafer that includes silicon can be determined based on the variation of the optical absorption coefficient of silicon with temperature. Temperatures above about 850° C., can be found by measuring phenomena that are affected by the magnitude of the optical absorption coefficient, especially at wavelengths >˜1 μm. Phenomena could include measuring light reflected, transmitted, emitted, absorbed, or scattered by the wafer and deriving the absorption coefficient from the measurements and then deriving temperature from the absorption coefficient. Temperature could be determined from a model relating phenomena directly to temperature, the model constructed based on absorption behaviour and techniques discussed herein. The resulting temperature could be used to calibrate or control a rapid thermal processing chamber or other apparatus. | 06-25-2009 |
20090232183 | SYSTEM AND METHOD TO MEASURE TEMPERATURE IN AN ELECTRIC MACHINE - A system and method to measure a characteristic of a component of an electric machine. The system includes an optical fiber disposed proximate to the component, at least one sensor, disposed along the optical fiber, to detect the temperature of the component, and a data acquisition system operably coupled to the sensor via the optical fiber to generate real-time data in accordance with the detected temperature of the component during an operation of the electric machines. | 09-17-2009 |
20090296778 | FLUORESCENT TEMPERATURE SENSOR - To use a simple structure to provide a fluorescent temperature sensor with increased accuracy through increasing the fluorescent light intensity of the fluorescent materials. A fluorescent temperature sensor for producing a temperature signal from a fluorescent light of a fluorescent material that is optically stimulated is provided with an LED for projecting light onto the fluorescent material, a photodiode for receiving the fluorescent light that is emitted by the fluorescent material, and a signal processing circuit for generating the temperature signal from the output of the photodiode. Optical fibers for the projected light, for conveying the light from the LED to the fluorescent material, and optical fibers for the received light, for conveying the light from the fluorescent material to the photodiode, are separated and independent from each other on one end side thereof, facing the respective elements, and on the other end side, which faces the fluorescent material, are bundled so as to be mixed together. | 12-03-2009 |
20100111136 | OPTICAL FIBER BASED POLYMER CORE SENSOR - An optical fiber based polymer core sensor includes an optical fiber having a core and an end having a cured polymer core affixed to the core of the optical fiber. The cured polymer core extends outward from the end of the optical fiber and has a diameter approximately equal to the core of the optical fiber. Note the cured polymer core can be substantially cylindrical, tapered or geometrically shaped. The optical fiber based polymer core sensor can be used to measure a temperature, measure a strain, measure a distance, measure a refractive index, detect or measure an analyte, detect a toxin, detect a biological agent, monitor a chemical process, or a combination thereof | 05-06-2010 |
20100128756 | DUAL SOURCE AUTO-CORRECTION IN DISTRIBUTED TEMPERATURE SYSTEMS - An automatic and continuous method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by choosing the wavelengths of the two sources so the primary source's return anti-Stokes component overlaps with the incident wavelength of the secondary light source thereby canceling out the non-identical attenuations generated by the wavelength differences between Stokes and anti-Stokes bands. | 05-27-2010 |
20100135356 | Monitoring a temperature and/or temperature related parameters of an optical element - An apparatus for monitoring a temperature and/or a temperature-dependent parameter of an optical element arranged in a path of a laser beam includes a measuring light source to produce measuring radiation and direct the measuring radiation to the optical element, a detector arranged to detect a portion of the measuring radiation that has passed through a passage region of the optical element, an evaluating device connected to the detector to monitor the temperature and/or the temperature-dependent parameter. The evaluating device is configured to determine the temperature and/or the temperature-dependent parameter based on an intensity of the measuring radiation detected by the detector in the passage region. | 06-03-2010 |
20100220765 | SENSOR AND METHOD FOR DETERMINING TEMPERATURE ALONG AN OPTICAL FIBRE - An optical fibre temperature sensor comprising: an optical pulse generator; an optical fibre into which said optical pulses are fed; an optical receiver to receive said optical pulses reflected by said optical fibre and to convert them into an electrical signal; a processor which receives said electrical signal and determines the temperature along said optical fibre; said optical receiver comprising a first filter and a second filter to filter said optical pulse reflected by said optical fibre, characterised in that said first and said second filters filter two adjacent portions of anti-Stokes optical signals or of Stokes optical signals | 09-02-2010 |
20110044371 | DISTRIBUTED OPTICAL FIBER SENSOR SYSTEM - A distributed optical fiber sensor system is provided. In this system, backward-scattered light generated in a test optical fiber is filtered to separate the backward-scattered light into Raman scattered light and Brillouin scattered light. The separated Raman scattered light and Brillouin scattered light are each converted into digital data. A change in temperature with respect to the distance of the test optical fiber is measured from the digital data of the Raman scattered light. A change in temperature and a change in the degree of deformation with respect to the distance of the test optical fiber are measured from the digital data of the Brillouin scattered light. The change in temperature and the change in the degree of deformation with respect to the distance of the test optical fiber are separately output using the measured data. | 02-24-2011 |
20110058590 | DEVICE FOR SPATIALLY RESOLVED TEMPERATURE MEASUREMENT - Apparatus for a spatially resolved temperature measurement, with at least one optical fiber ( | 03-10-2011 |
20110128990 | Optical fiber temperature sensor - An optical fiber temperature sensor includes an optical transceiver module, a transmission fiber and a sensing head. When the transmission fiber is a polarization maintaining fiber, the sensing head includes a temperature sensing element and a fiber reflector, the temperature sensing element is a section of polarization maintaining fiber. The transmission fiber is fusion spliced with the temperature sensing element, an angle between a polarization axis of the transmission fiber and that of the temperature sensing element is 45 degree at the fusion splicing point. When the transmission fiber is a single-mode fiber, the sensing head includes a polarizer. An angle between a polarization axis of the polarization maintaining fiber connecting the temperature sensing element with the polarizer and that of the polarization maintaining fiber of the temperature sensing element is 45 degree at the fusion splicing point. The present invention is of simple principle and structure, and facilitates manufacturing. | 06-02-2011 |
20110150035 | NON-INTRUSIVE METHOD FOR SENSING GAS TEMPERATURE AND SPECIES CONCENTRATION IN GASEOUS ENVIRONMENTS - The invention relates generally to a non-intrusive method for sensing gas temperature and species concentration in gaseous environments. The method includes the steps of providing a tunable diode laser (TDL) sensor having a plurality of robust telecommunications diode lasers and a detector. The method further includes the steps of positioning the TDL sensor in alignment with an optical port of a vessel; using the lasers to transmit light through the optical port; using the detector to receive the transmitted light and transmit a signal to a data collection device; determining a ratio of absorbance for different absorption transitions; and determining a gas temperature from the ratio of absorbance. | 06-23-2011 |
20110188537 | TEMPERATURE-COMPENSATED FIBRE OPTIC STRAIN GAUGE | 08-04-2011 |
20110222581 | PROBE FOR TEMPERATURE MEASUREMENT, TEMPERATURE MEASURING SYSTEM AND TEMPERATURE MEASURING METHOD USING THE SAME - A probe for temperature measurement uses interference of a low-coherence light beam. The probe includes a temperature acquiring member configured to be brought into contact with a surface of a temperature measurement target and thermally assimilate with the temperature measurement target; a light irradiating/receiving unit configured to irradiate a measurement light beam as a low-coherence light beam to the temperature acquiring member and receive reflected light beams from a front surface and a rear surface of the temperature acquiring member; and a housing configured to define a distance between the temperature acquiring member and the light irradiating/receiving unit to a preset length and isolate optical paths of the measurement light beam and the two reflected light beams from an atmosphere in which the temperature measurement target is placed. | 09-15-2011 |
20110280280 | CRYOGENIC FIBER OPTIC TEMPERATURE SENSOR AND METHOD OF MANUFACTURING THE SAME - This invention teaches the fiber optic sensors temperature sensors for cryogenic temperature range with improved sensitivity and resolution, and method of making said sensors. In more detail, the present invention is related to enhancement of temperature sensitivity of fiber optic temperature sensors at cryogenic temperatures by utilizing nanomaterials with a thermal expansion coefficient that is smaller than the thermal expansion coefficient of the optical fiber but larger in absolute value than the thermal expansion coefficient of the optical fiber at least over a range of temperatures. | 11-17-2011 |
20110299565 | MRI COMPATIBLE MEDICAL DEVICE TEMPERATURE MONITORING SYSTEM AND METHOD - A temperature monitoring system for a medical device comprises an optical transmit/receive unit, an elongate optical fiber having a proximal end, a distal end, and an inner core extending between the proximal end and the distal end, and one or more fiber Bragg grating elements formed in the inner core of the optical fiber. The optical fiber is operably coupled to the transmit/receive unit at the proximal end. At least a portion of the optical fiber is also operably coupled to a medical device and is structured to measure temperature at one or more temperature sensing locations on the medical device. | 12-08-2011 |
20110310925 | OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING DEVICE - There is provided an optical fiber temperature distribution measuring device which measures a temperature distribution along an optical fiber ( | 12-22-2011 |
20120033709 | TEMPERATURE MEASUREMENT SYSTEM AND TEMPERATURE MEASUREMENT METHOD - A temperature measurement system includes: a laser light source; an optical fiber; and a temperature measurement unit configured to acquire a measured temperature distribution of a temperature of a temperature measurement area along an installation path of the optical fiber by detecting backscattered light of the incident laser light in the optical fiber, wherein the temperature measurement unit sequentially makes a correction for the measured temperature distribution a plurality of times so as to make a square error between a convolution of a transfer function of the optical fiber along the installation path and the corrected temperature distribution and the measured temperature distribution smaller in each of the corrections, and the temperature measurement unit also replaces a corrected temperature at a specific point of the installation path with an estimated temperature at the specific point in each of the corrections. | 02-09-2012 |
20120033710 | OPTICAL TEMPERATURE SENSOR - The present invention relates to an optical temperature sensor, comprising: a housing; a light-transmitting unit, installed in the housing, for emitting light transmitted through an optical fiber into an inner space of the housing; and a bimetal device, movably installed in the housing, for varying the amount of transmitted light, wherein the optical temperature sensor is capable of measuring a temperature by using the amount of light, from the light transmitted via the optical fiber, which is shielded through bending due to a change in the temperature of the bimetal device, or using the amount of light, from the transmitted light, which is reflected and received. The optical temperature sensor has a simple structure and is not particularly restricted in terms of installation space. | 02-09-2012 |
20120039358 | Device for Measuring Temperature in Electromagnetic Fields - For a temperature measurement in areas having electromagnetic fields, shielding devices must be provided. According to the proposed technique, at least one temperature sensor is designed as a fiber-optic sensor having Bragg gratings (FBG), wherein the sensor is arranged in a non-metallic housing that precludes or minimizes expansion effects for the individual FBG sensors. For example, the proposed technique can be used advantageously to measure the temperature distribution in oil sand deposits, for which purpose a suitable measuring arrangement is required. | 02-16-2012 |
20120039359 | LOW PROFILE, HIGH TEMPERATURE, HYDROGEN TOLERANT OPTICAL SENSING CABLE - A sensing cable has a sensing fiber assembly, which includes a pair of sensing fibers joined by a turnaround section with a modal filter, at a terminating end of the sensing fibers. The sensing cable also includes an inner sleeve that surrounds the sensing fiber assembly and an armored casing that caps the terminating end of the inner sleeve. The sensing cable has a low profile and its components are each made of high temperature and hydrogen tolerant materials and are capable of prolonged operation at high temperatures, such as up to 300° C., in hydrogen environments over long lengths of fiber. A distributed thermal sensing (DTS) interrogator is connected to the sensing cable and performs DTS measuring according to protocols and algorithms that leverage the modal filter of the turnaround section to calculate temperature readings along the sensing fiber assembly. | 02-16-2012 |
20120039360 | METHOD FOR PERFORMING OPTICAL DISTRIBUTED TEMPERATURE SENSING (DTS) MEASUREMENTS IN HYDROGEN ENVIRONMENTS - A method for calculating a temperature along a length of a sensing fiber of a distributed thermal sensing (DTS) system. The sensing fiber, which has two ends, is heat resistant for operation up to 300° C. The DTS system includes a two-channel DTS interrogator that is attached to each of the two ends of the sensing fiber. The DTS interrogator interrogates the sensing fiber from both ends, calculates a temperature difference between co-located positions along the length of the sensing fiber for each end, and determines an error associated with the temperature difference. Based on the determined error, a corrected temperature value along the length of the sensing fiber is calculated and outputted. | 02-16-2012 |
20120039361 | DEPRESSED GRADED INDEX MULTI-MODE OPTICAL FIBER - A multi-mode optical waveguide fiber including a central core region having an outer radius surrounded by an inner cladding region having an outer radius, the inner cladding region having a lower index of refraction than the central core region, wherein both the central core and inner cladding regions are doped with fluorine, wherein the refractive index profile of the central core region is of the gradient index type and the central core region in the range of rε[0-r | 02-16-2012 |
20120044971 | POLARIZATION-MAINTAINING FIBER AND OPTICAL FIBER SENSOR USING SAME - The polarization-maintaining fiber of the invention includes a core ( | 02-23-2012 |
20120082182 | INTEGRATION OF AN OPTICAL WAVEGUIDE OF A SENSOR INTO A COMPONENT - The invention relates to a method for integrating an optical waveguide ( | 04-05-2012 |
20120093194 | METHOD AND SYSTEM TO MEASURE TEMPERATURE OF GASES USING COHERENT ANTI-STOKES DOPPLER SPECTROSCOPY - A method of measuring a temperature of a noble gas in a chamber includes providing the noble gas in the chamber. The noble gas is characterized by a pressure and a temperature. The method also includes directing a first laser beam into the chamber and directing a second laser beam into the chamber. The first laser beam is characterized by a first frequency and the second laser beam is characterized by a second frequency. The method further includes converting at least a portion of the first laser beam and the second laser beam into a coherent anti-Stokes beam, measuring a Doppler broadening of the coherent anti-Stokes beam, and computing the temperature using the Doppler broadening. | 04-19-2012 |
20120120984 | TEMPERATURE SENSITIVE COMPOSITE FOR PHOTONIC CRYSTALS - A composite photonic crystal comprising an inverse opal structure defining an ordered array of voids with a filler composition received within the voids. A property of the filler composition changes in response to a stimulus, such as a temperature change, thereby changing the band gap of radiation that is reflected by the composite photonic crystal. | 05-17-2012 |
20120120985 | TEMPERATURE SENSOR USING AN OPTICAL FIBER - A temperature sensor that has an elongated sensing element having a length of at least 10 m, measured at a temperature of 20° C. The elongated sensing element includes an elongated jacket and an optical fiber mounted in the jacket and having an EFL of at least 0.35%, wherein the elongated sensing element has an average temperature error of less than 2° C. | 05-17-2012 |
20120147924 | SYSTEM AND METHOD FOR DISTRIBUTED ENVIRONMENTAL PARAMETER MEASUREMENT - An apparatus for measuring environmental parameters includes: an optical fiber sensor configured to be disposed along a path in an environment to be measured, the path of the optical fiber sensor defining a longitudinal axis; and at least one section of the optical fiber sensor configured so that an entire length of the at least one section is exposed to an at least substantially homogeneous environmental parameter, at least part of the at least one section extending in a direction having a radial component relative to the longitudinal axis. | 06-14-2012 |
20120170613 | FIBER OPTIC SPLICE HOUSING AND INTEGRAL DRY MATE CONNECTOR SYSTEM - A fiber optic splice housing and integral dry mate connector system. In a described embodiment, a fiber optic connection system includes optical fiber sections in respective conduit sections. Each of the conduit sections is received in the housing assembly. An optical connection between the optical fiber sections is positioned within the housing assembly. | 07-05-2012 |
20120170614 | FIBER OPTIC SPLICE HOUSING AND INTEGRAL DRY MATE CONNECTOR SYSTEM - A fiber optic splice housing and integral dry mate connector system. In a described embodiment, a fiber optic connection system includes optical fiber sections in respective conduit sections. Each of the conduit sections is received in the housing assembly. An optical connection between the optical fiber sections is positioned within the housing assembly. | 07-05-2012 |
20120170615 | TEMPERATURE SENSOR USING AN OPTICAL FIBER - A temperature sensor that has an elongated sensing element having a length of at least 10 m, measured at a temperature of 20° C. The elongated sensing element includes an elongated jacket and an optical fiber mounted in the jacket and having an EFL of at least 0.35%, wherein the elongated sensing element has an average temperature error of less than 2° C. | 07-05-2012 |
20120183015 | Apparatus and method for spatially resolved temperature measurement - Apparatus for spatially resolved temperature measurement, comprising at least one optical fibre ( | 07-19-2012 |
20120201271 | Methods For Determining Wafer Temperature - Methods and apparatus for wafer temperature measurement and calibration of temperature measurement devices may be based on determining the absorption of a layer in a semiconductor wafer. The absorption may be determined by directing light towards the wafer and measuring light reflected from the wafer from below the surface upon which the incident light impinges. Calibration wafers and measurement systems may be arranged and configured so that light reflected at predetermined angles to the wafer surface is measured and other light is not. Measurements may also be based on evaluating the degree of contrast in an image of a pattern in or on the wafer. Other measurements may utilize a determination of an optical path length within the wafer alongside a temperature determination based on reflected or transmitted light. | 08-09-2012 |
20120207189 | TEMPERATURE MEASUREMENT APPARATUS AND METHOD - A temperature measurement apparatus includes a light source; a first splitter that splits a light beam into a measurement beam and a reference beam; a reference beam reflector that reflects the reference beam; an optical path length adjustor; a second splitter that splits the reflected reference beam into a first reflected reference beam and a second reflected reference beam; a first photodetector that measures an interference between the first reflected reference beam and a reflected measurement beam obtained by the measurement beam reflected from a target object; a second photodetector that measures an intensity of the second reflected reference beam; and a temperature calculation unit. The temperature calculation unit calculates a location of the interference by subtracting an output signal of the second photodetector from an output signal of the first photodetector, and calculates a temperature of the target object from the calculated location of the interference. | 08-16-2012 |
20120243572 | TEMPERATURE MEASURING APPARATUS AND TEMPERATURE MEASURING METHOD - A temperature measuring apparatus and a temperature measuring method that may simultaneously measure temperatures of objects in processing chambers. The temperature measuring apparatus includes a first light separating unit which divides light from the light source into measurement lights; second light separating units which divide the measurement lights from the first light separating unit into measurement lights and reference lights; third light separating units which further divide the measurement lights into first to n-th measurement lights; a reference light reflecting unit which reflects the reference lights; an light path length changing unit which changes light path lengths of the reference lights reflected by the reference light reflecting unit; and photodetectors which measure interference between the first to n-th measurement lights reflected by the objects to be measured and the reference lights reflected by the reference light reflecting unit. | 09-27-2012 |
20120243573 | PLASMA PROCESSING APPARATUS AND TEMPERATURE MEASURING METHOD - A plasma processing apparatus and a temperature measuring method that may measure a temperature of an object in a processing chamber by a low-coherence interferometer without forming a hole in a holding stage or an upper electrode of the plasma processing apparatus, thereby performing a plasma process of a substrate with high precision and uniformity. | 09-27-2012 |
20120300807 | FLEXIBLE STRIP COMPRISING AT LEAST ONE OPTICAL FIBRE FOR CARRYING OUT DEFORMATION AND/OR TEMPERATURE MEASUREMENTS - The invention relates to a flexible strip ( | 11-29-2012 |
20130028289 | DISPERSION AND LOSS SPECTRUM AUTO-CORRECTION DISTRIBUTED OPTICAL FIBER RAMAN TEMPERATURE SENSOR - A dispersion and loss spectrum auto-correction distributed optical fiber Raman temperature sensor has a dual fiber pulsed laser module with dual Raman wavelength shifts. The laser module is composed of a power supply ( | 01-31-2013 |
20130034122 | FLUORESCENCE BASED THERMOMETRY - A temperature sensor includes a photon source, a fluorescent element and a photodetector. The fluorescent element includes a temperature-insensitive first fluorophore and a temperature-sensitive second fluorophore. The photodetector includes a first photosensor exhibiting a first spectral responsivity and a second photosensor exhibiting a second spectral responsivity. The first fluorophore may be selected to optimize the first spectral responsivity and the second fluorophore may be selected to optimize the second spectral responsivity. To measure a temperature of a surface, the fluorescent element may be placed adjacent to the surface and irradiated with a photon beam. First photons emitted from the first fluorophore and second photons emitted from the second fluorophore are collected. The first and second photons may be transmitted as a single dichromatic beam to a photodetector that includes two photosensors having different respective spectral responsivities such that the two photosensors generate two different electrical output signals, the ratio of which may be correlated to temperature. | 02-07-2013 |
20130039384 | METHOD FOR MRI COMPATIBLE MEDICAL DEVICE TEMPERATURE MONITORING - A method of estimating temperature includes selecting a plurality of known calibration temperature values; determining a bulk wavelength for each of the calibration temperature values; formulating a calibration data set that includes the plurality of known temperature values and the corresponding plurality of bulk wavelengths; and using the calibration data set to determine an estimated current temperature value based upon a current bulk wavelength, wherein the current temperature value is estimated based upon one or more data points in the calibration data set. | 02-14-2013 |
20130100984 | OPTICALFIBER TEMPERATURE DISTRIBUTION MEASUREMENT APPARATUS - The present apparatus includes: an intensity ratio calculation unit configured to calculate a first and a second intensity ratios which are ratios of Stokes light intensity to anti-Stokes light intensity obtained when a light pulse is output to a first end and a second end of an optical fiber, respectively; a temperature calculation unit configured to calculate a temperature distribution along the optical fiber based on a reference temperature, the first and the second intensity ratios, and a total length loss ratio, which is a loss ratio of Stokes light to anti-Stokes light with regard to a total length of the optical fiber; and a total length loss ratio calculation unit configured to calculate the total length loss ratio based on the first and the second intensity ratios with regard to a location in a predetermined section close to both ends of the optical fiber whose temperature is kept constant. | 04-25-2013 |
20130121374 | FIBER OPTIC BIREFRINGENT THERMOMETER AND METHOD FOR MANUFACTURING THE SAME - A fiber optic thermometer is provided that uses a birefringent polarization maintaining sensing fiber as well as a single-mode transmission fiber for transmitting the optical signals between the sensing head and an optoelectronic module. The optoelectronic module contains two light sources operating at different spectral ranges. The unpolarized light from the light sources is sent through the transmission fiber, sent through a polarizer, and coupled into both birefringence axis of the sensing fiber. The waves are reflected at a reflector at a remote end of the sensing fiber, whereupon it returns through the sensing fiber, the polarizer and the transmission fiber. By analyzing the returned signal for both spectral ranges, a robust temperature signal can be derived. This thermometer design obviates the need for using a polarization maintaining fiber and polarization maintaining connectors between the optoelectronic module and the sensor head. | 05-16-2013 |
20130148691 | Distributed optical fiber temperature sensor based on optical fiber delay - The present invention discloses distributed optical fiber temperature sensor based on optical fiber delay technology, including a tunable optical transmitter module, an optical receiver module, a signal processing and controlling module and multiple distributed sensing modules connected in series via transmission fibers. The multiple wavelengths optical signals transmitted from the tunable optical transmitter module respectively are transmitted into the first sensing module, and then transmitted out from the last sensing module. The output multiple wavelengths optical signals arrive at the optical receiver module. The optical receiver module converts optical signals of all wavelengths into electrical signals and transmits them into the signal processing and controlling module. The signal processing and controlling module measures transmission delay time of optical signal of each wavelength respectively, and calculates and obtains the temperature parameters of corresponding distributed testing positions based on the relative delay time. | 06-13-2013 |
20130156066 | OPTIC FIBER DISTRIBUTED TEMPERATURE SENSOR SYSTEM WITH SELF-CORRECTION FUNCTION AND TEMPERATURE MEASURING METHOD USING THEREOF - The present invention is effective in that automatically corrected temperature can be measured using one light source and one optical detector. | 06-20-2013 |
20130170519 | Pipeline with Integrated Fiber Optic Cable - Apparatus and methods for integrating a fiber optic cable ( | 07-04-2013 |
20130208762 | Suppression of Stimulated Raman Scattering - An apparatus and method for suppressing stimulated Raman scattering (SRS) in fiber optic distributed temperature sensing systems by use of a combination of a pump and seed lasers with chosen frequency differences. | 08-15-2013 |
20130215929 | INDIRECT TEMPERATURE MEASUREMENTS OF DIRECT BANDGAP (MULTIJUNCTION) SOLAR CELLS USING WAVELENGTH SHIFTS OF SUB-JUNCTION LUMINESCENCE EMISSION PEAKS - Methods and structures may be used to measure operating temperatures of isolated cells and/or fully interconnected cells inside a Concentrator Photovoltaic (CPV) module. The method may use spectrometers to measure wavelength shifts of a sub-cell electro-luminescence and/or photo-luminescence emission spectrum. A sub-cells' intrinsic bandgap temperature-dependence relations may be used to indirectly compute the operating temperature of each subcell. A sub-cells' intrinsic bandgap temperature-dependence coefficients can be measured by performing quantum efficiency measurements and/or by recording the electro-luminescence and/or photo-luminescence emission profile of a solar cell at multiple temperatures. | 08-22-2013 |
20130215930 | TEMPERATURE MEASUREMENT SYSTEM AND TEMPERATURE MEASUREMENT METHOD - To measure the temperature in a temperature-measurement target disposed in a first area, an optical fiber is drawn to the first area from a second area having an adjusted temperature, and the optical fiber is installed in the temperature-measurement target. Furthermore, a reference temperature-measurement unit is provided in the second area. A temperature measurement apparatus detects backscattered light generated in the optical fiber, and detects temperatures at multiple measurement points along an installation path of the optical fiber. When making a correction on a signal outputted from the temperature measurement apparatus, a signal processor replaces temperatures at measurement points located in the second area among the measurement points with a temperature at the reference temperature-measurement unit. | 08-22-2013 |
20130250997 | FAST RESPONSE THERMOPILE POWER SENSOR - A power measuring sensor for an optical beam which utilizes the temperature difference across a thin layer of heat insulating material, generated by the axial flow of the absorbed beam, from an absorber layer on which the beam impinges, to a cooled heat sink which dissipates the heat after passage through the sensor. The axial heat flow is measured by means of a continuous matrix of adjacent thermocouple junctions over the heat flow region of the sensor disc, with the thermal insulating layer, which generates the temperature drop, having thicker and thinner regions at alternate junctions. The junctions on the thicker regions of the insulator thus become the hot junctions, and those on the thinner regions of the insulating layer become the cold junctions, and the sum of the voltages generated by the thermocouples is proportional to the flow of heat, and thus to the incident optical power. | 09-26-2013 |
20130308680 | TEMPERATURE SENSOR USING AN OPTICAL FIBER - A method for measuring a physical parameter at a plurality of spaced locations in a subterranean formation using a temperature sensor that has an elongated sensing element having a length of at least 10 m, measured at a temperature of 20° C. The elongated sensing element includes an elongated jacket and an optical fiber mounted in the jacket and having an EFL of at least 0.35%, wherein the elongated sensing element has an average temperature error of less than 2° C. | 11-21-2013 |
20130308681 | METHOD OF MEASURING TEMPERATURE OF COMPONENT IN PROCESSING CHAMBER OF SUBSTRATE PROCESSING APPARATUS - A component in a processing chamber of a substrate processing apparatus, where a temperature may be accurately measured by using a temperature measuring apparatus using an interference of a low-coherence light, even when a front surface and a rear surface are not parallel due to abrasion, or the like. A focus ring used in a vacuum atmosphere and of which a temperature is measured includes an abrasive surface exposed to an abrasive atmosphere according to plasma, a nonabrasive surface not exposed to the abrasive atmosphere, a thin-walled portion including a top surface and a bottom surface that are parallel to each other, and a coating member coating the top surface of the thin-walled portion, wherein a mirror-like finishing is performed on each of the top and bottom surfaces of the thin-walled portion. | 11-21-2013 |
20130308682 | DISTRIBUTED AND DYNAMICAL BRILLOUIN SENSING IN OPTICAL FIBERS - A method of distributed and dynamical Brillouin sensing in optical fibers is provided herein. The method includes the following stages: deriving average characteristics of an optical fiber along its length; generating a variable frequency probe signal, such that the variable frequency is tailored to match, at specified points along the fiber, the respective average characteristics; injecting the variable frequency probe signal to a first end of the optical fiber and a periodic pulse signal to a second end of the optical fiber, wherein the injecting is synchronized such that a stimulated Brillouin scattering is carried out at each one of the specified points along the optical fiber, such that a frequency difference between the probe signal and the pump signal matches the average characteristics of the fiber; and measuring occurrences of the stimulated Brillouin scattering, to yield data indicative of strain and temperature at all points along the optical fiber. | 11-21-2013 |
20130315280 | LED-BASED ILLUMINATION MODULE ON-BOARD DIAGNOSTICS - A light emitting diode (LED) based illumination module performs on-board diagnostics. For example, diagnostics may include estimating elapsed lifetime, degradation of phosphor, thermal failure, failure of LEDs, or LED current adjustment based on measured flux or temperature. The elapsed lifetime may be estimated by scaling accumulated elapsed time of operation by an acceleration factor derived from actual operating conditions, such as temperature, current and relative humidity. The degradation of phosphor may be estimated based on a measured response of the phosphor to pulsed light from the LEDs. A thermal failure may be diagnosed using a transient response of the module from a start up condition. The failure of LEDs may be diagnosed based on measured forward voltage. The current for LEDs may adjusted using measured flux values and current values and a desired ratio of flux values. Additionally, the LED current may be scaled based on a measured temperature. | 11-28-2013 |
20130322490 | OPTICAL FIBER SENSING SYSTEM - A method is presented for detecting an alarm condition with an optical fiber sensing system. An interrogator with a light source, a spectrometer, and a data processor is used to conduct a fast scan of a plurality of fiber optic sensing elements. First environmental parameter values are calculated for each fiber optic sensing element from spectrographic data collected by the interrogator during the first scan, and compared with a first threshold value. If the first environmental parameter value exceeds the first threshold value for any fiber optic sensing element, the fast scan is interrupted to perform a high resolution slow scan of that fiber optic sensing element. The optical fiber sensing system reports an alert if this high resolution slow scan indicates the alarm condition. | 12-05-2013 |
20140036957 | FIBRE OPTIC MONITORING INSTALLATION AND METHOD - The invention relates to installations for fibre optic monitoring of articles, and apparatus and methods for forming such installations, including a modular system and components for forming a fibre optic monitoring installation. Applications of the invention include the monitoring of vessels, chambers, and fluid conduits in industrial processing plants, and the invention has particular application to monitoring large vessels, for example temperature monitoring of vessels used in catalytic reforming processes. Convenient installation on or removal from the article being monitored is achieved by providing a support structure for the fibre optic length, which presents the fibre optic length in a preconfigured orientation suitable for monitoring the article. In a particular embodiment of the invention, the fibre optic length is disposed on a panel in a plurality of dense spiral patterns. | 02-06-2014 |
20140056328 | TEMPERATURE MEASUREMENT APPARATUS AND METHOD - A temperature measurement apparatus includes a light source; a first splitter that splits a light beam into a measurement beam and a reference beam; a reference beam reflector that reflects the reference beam; an optical path length adjustor; a second splitter that splits the reflected reference beam into a first reflected reference beam and a second reflected reference beam; a first photodetector that measures an interference between the first reflected reference beam and a reflected measurement beam obtained by the measurement beam reflected from a target object; a second photodetector that measures an intensity of the second reflected reference beam; and a temperature calculation unit. The temperature calculation unit calculates a location of the interference by subtracting an output signal of the second photodetector from an output signal of the first photodetector, and calculates a temperature of the target object from the calculated location of the interference. | 02-27-2014 |
20140064332 | COMBUSTION TURBINE FLASHBACK SENSING SYSTEM EMPLOYING FIBER BRAGG GRATING SENSORS - A combustion turbine flashback sensing system with a sensor cable that includes an optical fiber having at least one and preferably multiple fiber Bragg grating (FBG) temperature sensors along the fiber. The sensor cable is oriented in a combustor turbine upstream a combustion zone, so that it is capable of sensing temperature at multiple sensing points within the combustor. A protective conduit having a first thermal conductivity circumscribes the optical fiber. A sensor shield is oriented in circumferential proximity to the FBG temperature sensor. It is preferable that each such sensor has an associated sensor shield. The sensor shield has a thermal conductivity greater than the conduit thermal conductivity. The sensor shield facilitates FBG sensor rapid thermal response, with sufficient thermal and mechanical shielding to isolate the sensor from harsh operating conditions within the combustor, while the less thermally conductive conduit provides greater isolation protection for the cable structure. | 03-06-2014 |
20140133518 | TEMPERATURE SENSOR ARRANGEMENT - A temperature sensor arrangement for gas turbines is provided. The temperature sensor arrangement has a measuring probe. The measuring probe has a bore in which a steel tube is guided so as to be axially movable. The steel tube includes a glass fibre having Bragg grating measurement points for measuring the temperature. Elongate measurement openings enable hot gas to flow through the measuring probe, flowing round the steel tube in the region of the Bragg grating. | 05-15-2014 |
20140146850 | TEMPERATURE DISTRIBUTION MEASUREMENT APPARATUS AND TEMPERATURE DISTRIBUTION MEASUREMENT METHOD - A temperature distribution measurement apparatus includes a laser light source optically connected to an optical fiber, a photodetector configured to detect light backscattered in the optical fiber, and a temperature distribution measurement unit configured to obtain a true measured temperature distribution by performing correction calculation using a transfer function on a temporary measured temperature distribution obtained based on an output from the photodetector. The temperature distribution measurement unit stores therein data on a transfer function set for each entire length of the optical fiber and for each longitudinal position in the optical fiber. Then, when the length of the optical fiber is changed, the temperature distribution measurement unit changes the transfer function to be used in the correction calculation by using the data on the transfer function. | 05-29-2014 |
20140198823 | TEMPERATURE SENSING ARRANGEMENT, METHOD OF MAKING THE SAME AND METHOD OF SENSING TEMPERATURE - A temperature sensing arrangement includes a member having a first coefficient of thermal expansion, and an optical fiber having a second coefficient of thermal expansion. The optical fiber is strain transmissively mounted to the member. And the second coefficient of thermal expansion is greater than the first coefficient of thermal expansion such that strain measurable in the optical fiber is correlatable to temperature changes in the member. | 07-17-2014 |
20140241396 | OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASUREMENT DEVICE AND METHOD OF MEASURING OPTICAL FIBER TEMPERATURE DISTRIBUTION - An optical fiber temperature distribution measurement device configured to receive Raman back scattering lights obtained by inputting a pulsed light into an optical fiber and to measure a temperature distribution along a longitudinal direction of the optical fiber is provided. The device includes a first filter device. The first filter device includes: a threshold value setting circuit configured to set a threshold value in accordance with a change in an amount of noise overlapped with a measured signal, the measured signal indicating one of an intensity distribution and a temperature distribution of the Raman back scattering lights along the longitudinal direction of the optical fiber; a filter configured to eliminate a frequency component of the measured signal, the frequency component being larger than a predetermined first frequency; a determination circuit configured to determine if the measured signal is over the threshold value; a synthesizing circuit configured to select and synthesize one of the measured signal processed by the filter and the measured signal unprocessed by the filter in accordance with a determination result from the determination circuit. | 08-28-2014 |
20140254629 | OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASUREMENT DEVICE AND METHOD OF MEASURING OPTICAL FIBER TEMPERATURE DISTRIBUTION - An optical fiber temperature distribution measurement device for measuring a temperature distribution along a longitudinal direction of an optical fiber is provided. The device includes: a light transmitter configured to input a train of code-modulated light pulses into the optical fiber; a light receiver configured to receive Raman back scattering lights generated by inputting the train of code-modulated light pulses into the optical fiber; a demodulator configured to perform a correlation processing between a measured signal output from the light receiver and a code string associated with a type of the code modulation performed by the light transmitter, and to demodulate the measured signal; a storage storing a correction data to be used to correct a distortion of the measured signal output from the light receiver when an impulsive pulsed light is output from the light transmitter; and a corrector configured to perform a correction to one of the measured signal output from the light receiver and a demodulated signal output from the demodulator, using the correction data stored in the storage. | 09-11-2014 |
20150023389 | OPTICAL FIBER FOR TEMPERATURE SENSOR AND A POWER DEVICE MONITORING SYSTEM - An optical fiber for a temperature sensor and a power device monitoring system that can measure temperatures at different measurement positions by a simple construction are provided. An optical fiber for the sensor | 01-22-2015 |
20150063418 | LOSS COMPENSATION FOR DISTRIBUTED SENSING IN DOWNHOLE ENVIRONMENTS - An apparatus for estimating a parameter includes: an optical fiber sensor including at least one optical fiber configured to be disposed in a downhole location and including at least one sensing location configured to generate measurement signals; at least one light source configured to transmit a measurement signal having a wavelength to interrogate a sensing location and cause the sensing location to return a reflected measurement signal indicative of a measured parameter, and configured to transmit a reference signal and cause a reflected reference signal to be returned from a location associated with the sensing location, the reflected reference signal having a known relationship to hydrogen concentration; and a processor configured to receive the reflected measurement signal and the reflected reference signal, estimate the hydrogen concentration based on the reflected reference signal, and calibrate the first reflected signal based on the estimated hydrogen concentration. | 03-05-2015 |
20150092818 | Apparatus and Method for Monitoring a Reactor Surface - Apparatus for monitoring a reactor surface with a sensor cable, which is during operation at least partially arranged in the region of the reactor surface, has at least two optical fibers ( | 04-02-2015 |
20150103865 | OPTICAL WRITING DEVICE, IMAGE FORMING APPARATUS, AND TEMPERATURE CALCULATION METHOD - An optical writing device having; a plurality of light-emitting points; a photodiode configured to output a signal which represents a quantity of incident light from a predetermined light-emitting point selected from the plurality of light-emitting points; and a calculation section for calculating a temperature of the photodiode based on a magnitude of a photodiode dark current included in the signal output from the photodiode while the predetermined light-emitting point is OFF. | 04-16-2015 |
20150110156 | THERMOREFLECTANCE-BASED CHARACTERIZATION OF THERMOELECTRIC MATERIAL PROPERTIES - Systems and methods for characterizing one or more properties of a material are disclosed. In some embodiments, the one or more properties include one or more thermal properties of the material, one or more thermoelectric properties of the material, and/or one or more thermomagnetic properties of the material. In some embodiments, a method of characterizing one or more properties of a sample material comprises heating the sample material and, while heating the sample material, obtaining one or more temperature measurements for at least one surface of the sample material via one or more thermoreflectance probes and obtaining one or more electric measurements for the sample material that correspond in time to the one or more temperature measurements. The method further comprises computing one or more parameters that characterize one or more properties of the sample material based on the measurements. | 04-23-2015 |
20150117493 | Phosphor Thermometry Fiber Sensor - High precision phosphor temperature sensors are disclosed. The sensors include a light source that emits an excitation light through one or more optical fibers to one or more phosphors that produce fluorescent emission(s) when engaged by the excitation light. The fluorescent emission(s) is transmitted optically from the phosphor(s) directly to a detector or an optical diffraction grating before the light is received at a detector. The detector is linked to a controller, which measures the lifetime(s) of the fluorescent emission(s) and calculates the temperature at the phosphor(s) from said lifetime(s). | 04-30-2015 |
20150131700 | HIGH REPETITION RATE THERMOMETRY SYSTEM AND METHOD - A system and method for rapid thermometry using intrapulse spectroscopy can include a laser for propagating pulses of electromagnetic radiation to a region. Each of the pulses can be chirped. The pulses from the region can be detected. An intrapulse absorbance spectrum can be determined from the pulses. An instantaneous temperature of the region based on the intrapulse absorbance spectrum can be determined. | 05-14-2015 |
20150139276 | METHOD AND SYSTEM TO MEASURE TEMPERATURE OF GASES USING COHERENT ANTI-STOKES DOPPLER SPECTROSCOPY - A method of measuring a temperature of a noble gas in a chamber includes providing the noble gas in the chamber. The noble gas is characterized by a pressure and a temperature. The method also includes directing a first laser beam into the chamber and directing a second laser beam into the chamber. The first laser beam is characterized by a first frequency and the second laser beam is characterized by a second frequency. The method further includes converting at least a portion of the first laser beam and the second laser beam into a coherent anti-Stokes beam, measuring a Doppler broadening of the coherent anti-Stokes beam, and computing the temperature using the Doppler broadening. | 05-21-2015 |
20150308904 | MIXED-MODE TEMPERATURE MEASUREMENT COMMUNICATION PHASE CONDUCTOR AND TEMPERATURE MEASUREMENT COMMUNICATION SYSTEM - The disclosure provides a mixed-mode temperature measurement communication phase conductor and a temperature measurement communication system. The mixed-mode temperature measurement communication phase conductor includes: a stainless sleeving optical unit and a support line hinged with the stainless sleeving optical unit, wherein an aluminium wire is hinged outside the stainless sleeving optical unit and the support line; the stainless sleeving optical unit includes: multiple single-mode fibres and at least one multi-mode fibre, wherein fibres in the stainless sleeving optical unit are mutually hinged. The disclosure realizes whole-distance temperature measurement of conductor by setting the single-mode fibre to perform communication and the multi-mode fibre to perform temperature measurement. | 10-29-2015 |
20150316424 | LIGHT DIFFUSING FIBER THERMAL INDICATORS - A light diffusing fiber including one or more segments, and a thermochromic coating on at least a portion of the light diffusing fiber. The thermochromic coating is opaque at a first temperature, and is transparent at a second temperature. A system for detecting the temperature of an apparatus including the apparatus, a light diffusing fiber thermally coupled to the apparatus, and a light source optically coupled to the light diffusing fiber. A method for detecting the temperature of an apparatus including thermally coupling a light diffusing fiber to the apparatus, optically coupling a light source to the light diffusing fiber, and monitoring the light diffusing fiber for transmitted light. | 11-05-2015 |
20150377716 | Pipeline Constriction Detection - The present techniques are directed to a pipeline transporting a production fluid including hydrocarbon. An optical fiber is disposed along a length of the pipeline. A control system determines a predicted operating temperature based on pressure and flow rate of the production fluid in the pipeline. The control system determines a measured temperature along the pipeline using the optical fiber. The control system detects and locates a temperature anomaly by comparing the measured temperature of the pipeline to the predicted operating temperature. | 12-31-2015 |
20160018271 | OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING DEVICE - An optical fiber temperature distribution measuring device includes: an optical fiber as a sensor; a calculation control unit for measuring a temperature distribution along the optical fiber by using backward Raman scattered light from the optical fiber; a far-end-position dispersion characteristic calculation unit for obtaining a dispersion characteristic of the optical fiber at a far-end position thereof; a per-unit-length dispersion characteristic calculation unit for obtaining a per-unit-length dispersion characteristic of the optical fiber based on the dispersion characteristic of the optical fiber at the far-end position thereof; and a correction parameter calculation unit for calculating a correction parameter for correcting a dispersion characteristic of the optical fiber based on a dispersion characteristic at each of different positions along the optical fiber. | 01-21-2016 |
20160047763 | METHOD FOR DETECTING NON-SUPERCONDUCTING TRANSITION OF SUPERCONDUCTING WIRE - A method for detecting a non-superconducting transition of a superconducting wire including a substrate, a superconducting layer having a critical temperature of 77 K or more, and a metal stabilization layer includes, adhesively attaching an optical fiber where a plurality of fiber Bragg gratings are formed in a core along a longitudinal direction thereof to the superconducting wire; measuring in advance a Bragg wavelength shift of the fiber Bragg gratings for a temperature variation of the superconducting wire, and determining a relational expression based on the shift for a temperature calculation of the superconducting wire; determining temperature variations of the fiber Bragg gratings before and after the non-superconducting transition of the superconducting wire using the relational expression; and calculating a propagation rate of the non-superconducting transition based on both a time difference of temperature increases of the fiber Bragg gratings, and an interval between each of the fiber Bragg gratings. | 02-18-2016 |
20160084718 | DEVICE AND METHOD FOR TEMPERATURE DETECTION AND MEASUREMENT USING INTEGRATED COMPUTATIONAL ELEMENTS - An optical computing device and method for determining and/or monitoring temperature and temperature variation data in real-time by deriving the data from the output of an optical element. | 03-24-2016 |
20160084719 | STRAIN-FREE SENSOR - A strain-free sensor includes a conductor extending from a first end to a second end through an intermediate portion. The conductor has a first coefficient of thermal expansion. A coating is bonded to the intermediate portion of the conductor. The coating has a second coefficient of thermal expansion that is distinct from the first coefficient of thermal expansion. A tube is disposed about the conductor. The tube includes an inner surface provided with a plurality of projections. The conductor is slidingly arranged within the tube with the plurality of projections being configured and disposed to establish a substantially friction-free interface between the tube and the conductor forming the strain-free sensor. | 03-24-2016 |
20160161346 | Fiber-Optic Sensor with a Protective Tube and Method for Installing a Fiber-Optic Sensor in the Protective Tube - A method for installing a fiber-optic sensor in a protective tube, wherein a reshapable filler element which is preferably a wire made of spring steel is used as the filler element that, when twisted assumes an essentially helical shape, is introduced into the protective tube essentially in parallel to the axis of the fiber-optic sensor, where by changing the shape of the filler element, the free internal cross-section of the protective tube remaining for supporting the fiber-optic sensor is reduced such that the sensor is pressed against the wall of the protective tube whereby the thermal interface between the protective tube and sensor is improved and the reaction time during temperature measurements is reduced. | 06-09-2016 |
20160195436 | TEMPERATURE MEASUREMENT APPARATUS AND METHOD | 07-07-2016 |
20220136910 | OPTOELECTRONIC TRANSDUCER MODULE FOR THERMOGRAPHIC TEMPERATURE MEASUREMENTS - Examples of a optoelectronic transducer module with integrated signal processing for use in thermographic temperature measurement are disclosed. The module includes a light source to provide an excitation light, an optical element to couple the light to an optical port, a connector configured to connect the optoelectronic transducer module to a fiber optic sensor, a detector coupled to the optical port to detect an emitted light from the fiber optic sensor and convert the detected emitted light into an electrical signal, a module processing unit coupled to the light source and the detector configured to convert the electrical signal into a set of digital results, a high speed circuitry in communication with an external processing unit for data aggregation and a low speed circuitry in communication with the external processing unit for configuration and firmware upgrade in the module. | 05-05-2022 |