Class / Patent application number | Description | Number of patent applications / Date published |
356517000 | For refractive indexing | 25 |
20090161114 | REFRACTIVE-INDEX MEASUREMENT SYSTEM AND METHOD FOR MEASURING REFRACTIVE-INDEX - A refractive-index measurement system includes a light source, a first beam splitter, a first reflective mirror, a second reflective mirror, a second beam splitter, a container, a first polarizer, and a second polarizer. The first beam splitter splits light emitted from the light source into first and second light beams. The first light beam and the second light beam are reflected by the first reflective mirror and the second reflective mirror, respectively, incident into the second light beam splitter. The container is positioned along an optical pathway of first light beam. The container accommodates a lens and is filled with a medium having a refractive index substantially the same as a theoretical refractive index of the lens. The first polarizer is positioned along the optical pathway of the first light beam. The second polarizer is positioned along an optical pathway of the second light beam. | 06-25-2009 |
20100149548 | Reticle Inspection Systems and Method - A method and systems for reticle inspection. The method includes coherently illuminating surfaces of an inspection reticle and a reference reticle, applying a Fourier transform to scattered light from the illuminated surfaces, shifting the phase of the transformed light from the reference reticle such that a phase difference between the transformed light from the inspection reticle and the transformed light from the reference reticle is 180 degrees, combining the transformed light as an image subtraction, applying an inverse Fourier transform to the combined light, and detecting the combined light at a detector. An optical path length difference between two optical paths from the illumination source to the detector is less than a coherence length of the illumination source. The image detected by the detector represents a difference in amplitude and phase distributions of the reticles allowing foreign particles, defects, or the like, to be easily distinguished. | 06-17-2010 |
20100165355 | REFRACTIVE INDEX DISTRIBUTION MEASUREMENT METHOD AND REFRACTIVE INDEX DISTRIBUTION MEASUREMENT APPARATUS - A refractive index distribution measurement method includes the steps of measuring a first transmission wavefront of a test object by introducing reference light to the test object immersed in a first medium having a first refractive index lower than that of the test object by 0.01 or more, measuring a second transmission wavefront of the test object by introducing the reference light to the test object immersed in a second medium having a second refractive index lower than that of the test object by 0.01 or more and different from the first refractive index, and obtaining a refractive index distribution of the test object based on a measurement result of the first transmission wavefront and a measurement result of the second transmission wavefront. | 07-01-2010 |
20100188665 | Methods and systems for interferometric analysis - This invention provides methods and devices for analyzing interference patterns. The methods include fitting a Gaussian distribution to a cross correlation of two patterns from interferometric analysis of a liquid at a first and second time; identifying a positional shift of the pattern by comparing a selected value of the Gaussian distributions of the pattern at the first and second times; and determining a change in refractive index of the liquid from the positional shift. In another aspect, a method of extending the dynamic range of an interferometric data set is provided that comprises linearizing the data set, for example, using the arcsine function. | 07-29-2010 |
20100238456 | Interferometer - An interferometer comprises a source of a light beam, and a beam splitter for splitting the light beam from the source into at least first and second beams. A first (reference) reflector is positioned in the path of the first light beam. A second reflector, comprising a convergent lens and a mirror, is positioned in the path of the second light beam following reflection from a target. At least one detector is provided for detecting fringes formed by interference of the first and second light beams following reflection from the first and second reflectors respectively. The mirror of the second reflector has a radius of curvature within 10% of the value determined using the formula (I): and the focal length f of the convergent lens is within 10% of the value determined using the formula (II): where i are the segments of optical path, each of length l | 09-23-2010 |
20100290062 | Microstructured fibre bragg grating sensor - The invention involves a sensor ( | 11-18-2010 |
20110134438 | REFRACTIVE INDEX DISTRIBUTION MEASURING METHOD AND REFRACTIVE INDEX DISTRIBUTION MEASURING APPARATUS - The measuring method includes a step of causing reference light to enter an object placed in a first medium to measure a first transmitted wavefront, a step of causing the reference light to enter the object placed in a second medium to measure a second transmitted wavefront, a step of measuring first and second placement positions where the object is placed in the first and second media, and a calculating step of calculating an internal refractive index distribution of the object by using measurement results of the first and second transmitted wavefronts. The calculating step calculates the internal refractive index distribution from which a shape component of the object is removed by using the measurement results of the first and second transmitted wavefronts, and first and second reference transmitted wavefronts of a reference object to be placed at positions identical to the first and second placement positions. | 06-09-2011 |
20120019834 | MULTIPLEXED INTERFEROMETRIC DETECTION SYSTEM AND METHOD - Disclosed are improved optical detection systems and methods comprising multiplexed interferometric detection systems and methods for determining a characteristic property of a sample, together with various applications of the disclosed techniques. | 01-26-2012 |
20120057173 | SENSOR ARRANGEMENT AND DETECTION METHOD - The invention relates to an optical sensor arrangement comprising a measuring optical fiber demonstrating birefringence modifiable as a function of a measurement variable, and to an optical analysis unit having two optical branches implemented as optical fibers forming a Mach-Zehnder interferometer and an optical coupler for bringing together light guided in the two branches, wherein at least one output of the coupler is optically connected to at least one light-sensitive element, and wherein the analysis unit comprises a polarizing beam splitter from which the optical branches originate, wherein the measurement optical fiber is connected upstream of an optical input of the polarizing beam splitter, and wherein a polarization converter is disposed in a course of one of the optical branches. The invention further relates to a detection method that can be performed using said sensor arrangement. | 03-08-2012 |
20120069350 | MEASURING METHOD OF REFRACTIVE INDEX AND MEASURING APPARATUS OF REFRACTIVE INDEX - A measuring method includes measuring a sum of an optical path length of a test object and a first medium in a first container, introducing light into an area that includes the first medium but does not include the test object and measuring the optical path length of the first medium, measuring a sum of the optical path length of the test object and a second medium in a second container, the second medium having a refractive index different from that of the first medium, introducing the light into an area that includes the second medium but does not include the test object and of measuring the optical path length of the second medium, and calculating a refractive index of the test object based on the measured optical path lengths and an actual distance of an optical path for which each optical path length is measured. | 03-22-2012 |
20120176627 | Temperature Stable Interferometer - This invention provides an interferometric detection device configured to maintain a temperature of a sensing area to within 20 m° C. of a first target temperature and to maintain a temperature of the medium within 500 m° C. of a second target temperature The device can do so under conditions in which ambient temperature changes from 0.1° C. to 5° C. over 5 minutes. | 07-12-2012 |
20120243002 | METHOD AND APPARATUS FOR MEASURING REFRACTIVE INDEX - A method and apparatus for measuring refractive index of an object are disclosed. The method includes, acquiring a number of first fringes of a first interference pattern formed by interference of a first beam of light transmitted through the object with a second beam of light not transmitted through the object; acquiring a number of second fringes of a second interference pattern formed by interference of a third beam of light reflected from a first surface of the object with a fourth beam of light transmitted through the object and reflected from a second surface of the object; and calculating the refractive index of the object based on the number of first fringes and the number of second fringes. The method may further include calculating the Abbe number of the object based on the refractive indices of the object measured at different wavelengths. | 09-27-2012 |
20120268746 | Chirp Modulation-Based Detection of Chirped Laser Molecular Dispersion Spectra - An apparatus and method for detecting refractive index variations in a sample is disclosed. The apparatus includes a multi frequency laser source configured to generate a mixed laser beam having at least two optical frequencies. A sinusoidal function generator is configured to modulate the optical frequencies to generate a chirp-modulated mixed laser beam. The chirp-modulated mixed laser beam being configured to pass through the sample. A detector is configured to detect the chirp-modulated mixed beam. A signal processer is configured to process the detected chirp-modulated mixed beam to measure refractive index variations in the sample. | 10-25-2012 |
20130057873 | SYSTEM AND METHOD FOR MEASURING THE RATIO OF FORWARD-PROPAGATING TO BACK-PROPAGATING SECOND HARMONIC-GENERATION SIGNAL, AND APPLICATIONS THEREOF - A method and system that enable the measurement of a second-harmonic-generation-forward/backward (SHG F/B) ratio from an object by performing only a single image scan using via epi-imaging using an epi-detection technique. Two simultaneous SGH images (a forward propagating SHG “F” image and a back propagating SHG “B” image) are generated during the single image scan. A pinhole mirror can be used to separate the F-SHG and the B-SHG, which are detected by separate detectors. | 03-07-2013 |
20130094029 | Vernier photonic sensor data-analysis - Quantifying a refractive index of a test medium by obtaining spectral data representative for an optical signal being modulated with an optical transfer characteristics of a photonic sensor, the modulation being obtained by combining modulation of a first electromagnetic wave component in an optical filter element with a first periodic transfer spectrum having a first free spectral range and modulation of a second electromagnetic wave component in an optical filter element with a second periodic transfer spectrum having a second free spectral range being different from the first free spectral range. A relative is change induced in the second periodic transfer spectrum by bringing the test medium in proximity with the optical filter element with the second periodic transfer spectrum. The refractive index of the test medium is quantified by determining a wavelength offset of an envelope signal in said spectral data. | 04-18-2013 |
20130094030 | METHODS AND SYSTEMS FOR USE IN IMAGING USING INTERFEROMETRY - Methods and/or systems are disclosed herein for use in imaging an object including using interferometry while modifying at least one characteristic of the object (e.g., refractive index of the object). | 04-18-2013 |
20140009765 | METHOD OF MEASURING REFRACTIVE INDEX DISTRIBUTION, METHOD OF MANUFACTURING OPTICAL ELEMENT, AND MEASUREMENT APPARATUS OF REFRACTIVE INDEX DISTRIBUTION - A method of measuring a refractive index distribution includes steps of setting a plurality of different arrangements by a translation movement in a state where an object is arranged in first and second media having refractive indices different from a refractive index of the object, measuring transmissive wavefront of the object for each of media and each of the plurality of arrangements by reference light entering the object (S | 01-09-2014 |
20140092395 | METHOD FOR AUTOMATED INLINE DETERMINATION OF THE REFRACTIVE POWER OF AN OPHTHALMIC LENS - A method for an automated inline determination of the refractive power of an ophthalmic lens ( | 04-03-2014 |
20150036149 | SYSTEM FOR CONTROLLING AN OPTICAL SURFACE TO BE MEASURED | 02-05-2015 |
20160076999 | REFRACTIVE INDEX BASED MEASUREMENTS - A refractive index based measurement of a property of a fluid is measured in an apparatus including a variable wavelength coherent light source, a sample chamber, a wavelength controller, a light sensor, a data recorder and a computation apparatus, by—directing coherent light having a wavelength along an input light path, —producing scattering of the light from each of a plurality of interfaces within the apparatus including interfaces between the fluid and a surface bounding the fluid, the scattering producing an interference pattern formed by the scattered light, —cyclically varying the wavelength of the light in the input light path over a 1 nm to 20 nm wide range of wavelengths a rate of from 10 Hz to 50 KHz, —recording variation of intensity of the interfering light with change in wavelength of the light at an angle of observation, and—calculating the property from the variation. | 03-17-2016 |
20160077000 | REFRACTIVE INDEX BASED MEASUREMENTS - In a method for performing a refractive index based measurement of a property of a fluid such as chemical composition or temperature by observing an apparent angular shift in an interference fringe pattern produced by back or forward scattering interferometry, ambiguities in the measurement caused by the apparent shift being consistent with one of a number of numerical possibilities for the real shift which differ by 2n are resolved by combining measurements performed on the same sample using light paths therethrough of differing lengths. | 03-17-2016 |
20160091421 | REFRACTIVE INDEX BASED MEASUREMENTS - In a method for performing a refractive index based measurement of a property of a fluid such as chemical composition or temperature, a chirp in the local spatial frequency of interference fringes of an interference pattern is reduced by mathematical manipulation of the recorded light intensity in the interference pattern or by the physical positioning and arrangement of a detector used for capturing the interference pattern. | 03-31-2016 |
20160153901 | METHOD FOR MEASURING REFRACTIVE INDEX, REFRACTIVE INDEX MEASURING DEVICE, AND METHOD FOR PRODUCING OPTICAL ELEMENT | 06-02-2016 |
20160161403 | REFRACTIVE INDEX DISTRIBUTION MEASURING METHOD, REFRACTIVE INDEX DISTRIBUTION MEASURING APPARATUS, AND OPTICAL ELEMENT MANUFACTURING METHOD - A test unit is formed by sandwiching a test lens by a first reference lens whose shape and refractive index are known, a second reference lens whose shape and refractive index are known, and a medium. A wavefront of light transmitted through the test unit is measured, and, by using the shape and the refractive index of the first reference lens, the shape and refractive index of the second reference lens, and the measured wavefront of the test unit, the refractive index distribution of the test lens is calculated. | 06-09-2016 |
356518000 | Having Schlieren effect | 1 |
20120038931 | MONITORING ENERGY AND MATTER FLUXES BY USE OF ELECTROMAGNETIC RADIATIONS - Apparatus and method are provided for monitoring and measuring matter and energy fluxes by use of devices able to detect refractive index changes. In one aspect, apparatus use an interference between two electromagnetic radiations in order to provide high sensitivity, enabling fluxes monitoring at the microscopic scale, by measuring phase changes or Optical Path Length (OPL) changes. In one aspect, methods are provided for monitoring and measuring the electrical activity of a biological cells, simultaneously on several cells, without use of electrodes and contrast agents. | 02-16-2012 |