Patent application number | Description | Published |
20080292256 | Optical Fiber with Tin Doped Core-Cladding Interface - The present invention concerns an optical fiber | 11-27-2008 |
20100158459 | Long Lifetime Optical Fiber and Method - A fiber optic construction is described combining low OH (preferably <1 ppm) materials for use in the core and cladding elements with controlled D | 06-24-2010 |
20100166358 | Dual Fiber Grating and Methods of Making and Using Same - A multiple-layer fiber-optic sensor is described with dual Bragg gratings in layers of different materials, so that the known temperature and strain response properties of each material may be utilized to simultaneously correct the sensor output for temperature and strain effects. | 07-01-2010 |
20100303403 | ON-LINE FIBER BRAGG GRATING DITHERING - An apparatus for determining a property, the apparatus including: an optical fiber having a series of fiber Bragg gratings, each fiber Bragg grating in the series being characterized by a light reflection frequency at which the fiber Bragg grating reflects light; wherein: the light reflection frequency for each fiber Bragg grating is different from the light reflection frequency of each adjacent fiber Bragg grating to minimize resonance of light between at least two of the fiber Bragg gratings in the series; at least two fiber Bragg gratings in the series have light reflection frequencies that overlap; and a change in the light reflection frequency of each fiber Bragg grating in the series is related to the property at the location of the each fiber Bragg grating. | 12-02-2010 |
20110135246 | BEND INSENSITIVE OPTICAL FIBER WITH IMPROVED HYDROGEN RESISTANCE - An optical fiber includes: a core including a photosensitive material disposed therein, the core having a first index of refraction; a depressed cladding surrounding the core and having a second index of refraction that is lower than the first index of refraction; and an outer cladding surrounding the depressed cladding and having a third index of refraction that is higher than the depressed cladding. | 06-09-2011 |
20110138861 | OPTICAL FIBER MANUFACTURING METHOD AND APPARATUS - A method of manufacturing an optical fiber includes: disposing an axially extending preform structure on a support structure; directing a gas mixture along a major axis of the preform structure in a first axial direction; disposing a heating device proximate to the preform structure; and activating the heating device and moving the heating device along the major axis in a second axial direction to heat the preform structure and deposit at least one layer of material on the preform structure, the second axial direction being opposite to the first axial direction. | 06-16-2011 |
Patent application number | Description | Published |
20110110620 | ROTATED SINGLE OR MULTICORE OPTICAL FIBER - An apparatus for estimating a shape, the apparatus including: an optical fiber configured to conform to the shape and having a first core offset from a centerline of the optical fiber, the first core having an optical characteristic configured to change due to a change in shape of the optical fiber wherein a change in the optical characteristic is used to estimate the shape. A method for estimating a shape is also disclosed. | 05-12-2011 |
20110170116 | EFPI SENSOR - An apparatus for estimating a property, the apparatus includes: a hollow core tube having a first opening and a second opening; a first optical waveguide disposed within the first opening; and a second optical waveguide disposed within the second opening and spaced a distance from the first optical waveguide, the distance being related to the property; wherein a portion of at least one of the optical waveguides within the tube is perimetrically isolated from the tube. | 07-14-2011 |
20110172959 | MULTI-GAP INTERFEROMETRIC SENSORS - An apparatus for estimating a property includes a hollow core tube and an input light guide disposed at least partially within hollow core tube. The apparatus also includes a second gap disposed within the hollow core tube and separated from the input light guide by an air gap width. The second gap is formed of a first solid material and has a second gap width. The apparatus also includes a third gap disposed at least partially within the hollow core tube and being further from the input light guide than the second gap. The third gap is formed of a second solid material and has a third gap width. | 07-14-2011 |
20120125596 | RUGGEDIZED FIBER OPTIC CABLE AND METHOD OF OPTICAL FIBER TRANSMISSION - A fiber optic cable includes: a first elongated body, the first elongated body having a longitudinal axis; an elongated sleeve disposed coaxially with the first elongated body, the elongated sleeve including a plurality of second elongated bodies wrapped around an exterior surface of the first elongated body; and at least one elongated fiber optic component disposed inside of and coaxially with at least one of the first elongated body and a second elongated body. | 05-24-2012 |
20120175513 | Sensor Array Configuration for Swept-Wavelength Interferometric-Based Sensing Systems - A method, system and apparatus for obtaining a parameter of interest relating to a wellbore is disclosed. A fiber optic cable having a plurality of sensors is disposed in the wellbore, wherein the plurality of sensors have reflectivity values configured to provide improved signal-to-noise ratio compared to signal-to-noise ratio of a plurality of sensors having substantially same reflectivity values. Light is propagated into the fiber optic cable from a light source and signals are received at a detector from the plurality of sensors in response to interaction of the propagated light with the plurality of sensors. A processor may be used to obtain the parameter of interest from the received signals. The fiber optic cable may be coupled to a member in the wellbore, wherein the parameter of interest is related to the member. | 07-12-2012 |
20120224801 | FIBER OPTIC SEALING APPARATUS - An optical fiber seal includes: an annular layer bonded to an outer glass layer of a length of an optical fiber; and a glass sealing layer bonded to an outer surface of the annular layer and configured to withstand conditions in a downhole environment, the glass sealing layer configured to hermetically seal the length of the optical fiber. | 09-06-2012 |
20120243881 | Extended Temperature Fiber Optic Cable Design - A fiber optic cable for use in a downhole environment is disclosed. The fiber optic cable includes a tube having an interior region; an optical fiber disposed in the interior region of the tube; a gas in the interior region; and a gel in the interior region, wherein the gel is configured to reduce stress on the optical fiber in the presence of the gas at a temperature substantially near the flashpoint of the gel. One or more seals can be used to seal the gel and the inert gas in the interior region. In various aspects, the fiber optic cable can be used in a downhole environment. | 09-27-2012 |
20120314988 | ROTATED SINGLE OR MULTICORE OPTICAL FIBER - An apparatus for estimating a shape, the apparatus including: an optical fiber configured to conform to the shape and having a first core offset from a centerline of the optical fiber, the first core having an optical characteristic configured to change due to a change in shape of the optical fiber wherein a change in the optical characteristic is used to estimate the shape. A method for estimating a shape is also disclosed. | 12-13-2012 |
20130032177 | METHOD AND APPARATUS FOR STRIPPING OPTICAL FIBERS AND OPTICAL FIBER ASSEMBLIES - A method of removing a polymer material from an optical fiber assembly includes: disposing a liquid metallic material proximate to the polymer material, the polymer material being bonded to the optical fiber; heating the liquid metallic material to a temperature sufficient to burn the polymer material and de-bond the polymer material from a surface of the optical fiber; and removing the polymer material and liquid metal from the surface of the optical fiber. | 02-07-2013 |
20130034324 | OPTICAL FIBER SENSOR AND METHOD FOR ADHERING AN OPTICAL FIBER TO A SUBSTRATE - An optical fiber sensing apparatus includes: a substrate configured to deform in response to an environmental parameter; an optical fiber sensor including a core having at least one measurement location disposed therein and a protective coating surrounding the optical fiber sensor, the protective coating made from a polyimide material; and an adhesive configured to adhere the optical fiber sensor to the substrate, the adhesive made from the polyimide material. | 02-07-2013 |
20130087937 | Phase Mask Period Control - A method, apparatus and system for forming a fiber optic cable is disclosed. A first pattern of a phase mark is formed at a first location in the fiber optic cable. A relational parameter between the fiber optic cable and the phase mask is changed and a second pattern of the phase mask is formed at a second location in the fiber optic cable. The second pattern is related to the first pattern via the change in the relational parameter between the fiber optic cable and the phase mask. A controller can be used to control the relational parameter. | 04-11-2013 |
20130091956 | SENSING ASSEMBLY - A sensing assembly including a fiber for monitoring at least one condition or parameter and a strip formed from a pair of laminae disposed with the fiber. The laminae are arranged parallel to each other and engaged longitudinally along the fiber for enabling the strip to secure the fiber in place. A method of monitoring a parameter or condition with a sensing assembly is also included. | 04-18-2013 |
20130094011 | DISTANCE MEASUREMENT USING INCOHERENT OPTICAL REFLECTOMETRY - A method for estimating a distance includes: generating an optical signal having a wavelength that is within a wavelength range, the optical signal modulated via a modulation signal having a modulation frequency; transmitting the modulated optical signal from a light source into the optical fiber, the optical fiber in contact with a moveable strain inducing element located at the position along the optical fiber, the optical fiber including a plurality of sensing locations configured to reflect light within the wavelength range when under strain from the strain inducing element and transmit light within the wavelength range when not under strain from the strain inducing element; receiving a reflected signal including light reflected from at least one of the sensing locations; demodulating the reflected signal with a reference signal to generate reflected signal data; and determining the distance to the position along the optical fiber based on the reflected signal data. | 04-18-2013 |
20130094808 | METHOD AND SYSTEM FOR PRODUCING A COATED FIBER BRAGG GRATING OPTICAL FIBER - A method of producing a coated FBG optical fiber involves coating the optical fiber prior to writing the Bragg grating. A system for producing the coated FBG optical fibers includes a high temperature furnace from which to draw the fiber, a coating applicator that may be a carbon coating applicator, a cooling station, and a grating writing station. | 04-18-2013 |
20130311095 | MULTI-GAP INTERFEROMETRIC SENSORS - An apparatus for estimating a property includes a hollow core tube and an input light guide disposed at least partially within hollow core tube. The apparatus also includes a second gap disposed within the hollow core tube and separated from the input light guide by an air gap width. The second gap is formed of a first solid material and has a second gap width. The apparatus also includes a third gap disposed at least partially within the hollow core tube and being further from the input light guide than the second gap. The third gap is formed of a second solid material and has a third gap width. | 11-21-2013 |
20140202682 | APPARATUS FOR STRIPPING OPTICAL FIBERS AND OPTICAL FIBER ASSEMBLIES - An apparatus for performing a downhole operation includes: a carrier configured to be deployed in a borehole in an earth formation; and an optical fiber assembly disposed at the carrier, the optical fiber assembly including an optical fiber and a polymer material bonded to a length of the optical fiber. A portion of the polymer material has been removed by: disposing a liquid metallic material proximate to the polymer material, the polymer material being bonded to the optical fiber; heating the liquid metallic material to a temperature sufficient to burn the polymer material and de-bond the polymer material from a surface of the optical fiber; and removing the polymer material and liquid metal from the surface of the optical fiber. | 07-24-2014 |