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8182099 |
Noise immune optical encoder for high ambient light projection imaging systems
A method and apparatus for bitstream modulation of an infrared light source used by an optical sensor in a stereoscopic projection system, combined with a bitstream filter on the receiver electronics.
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8058869 |
Fiber laser magnetic field sensor
The device includes two supports and a primary conductive strip. The primary conductive strip includes a neutral surface, a first side, and a second side. The primary conductive strip is connected...
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8031988 |
Apparatus for pressure sensing
The present invention provides an apparatus for pressure sensing. The apparatus comprises a light guide, a Bragg grating incorporated into the light guide and a moveable wall portion. The moveable...
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8028343 |
Scanning probe microscope with independent force control and displacement measurements
A nanoindenter that includes an interferometer, a rod, a force actuator and a controller is disclosed. The interferometer generates a light beam that is reflected from a moveable reflector, the...
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7973914 |
Physical quantity measuring apparatus utilizing optical frequency domain reflectometry and method for temperature and strain measurement using the apparatus
A physical quantity measuring apparatus utilizing optical frequency domain reflectometry includes a tunable laser; a first polarization maintaining fiber; a polarization maintaining coupler; a...
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7966135 |
Characterizing curvatures and stresses in thin-film structures on substrates having spatially non-uniform variations
Techniques and devices are described to use spatially-varying curvature information of a layered structure to determine stresses at each location with non-local contributions from other locations...
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7961331 |
Sensing a disturbance along an optical path
The present invention relates to a system for sensing a disturbance in a sensing region along an optical path. The sensing system includes: a source of optical radiation; an upstream junction for...
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7929120 |
Apparatus for controlling optical fringe generation member based on detected optical fringe and method therefor
An optical fringe generation member control apparatus is provided. The control apparatus includes a detection unit that is configured to detect an optical fringe. Further, the control apparatus...
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7894077 |
Multi-directional projection type moire interferometer and inspection method of using the same
A multi-directional projection type moiré interferometer includes a stage, an image formation part, rotating mirrors, fixed mirrors, and a pattern illumination generating part. The stage moves a ...
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7889332 |
Physical quantity measuring apparatus utilizing optical frequency domain reflectometry, and method for simultaneous measurement of temperature and strain using the apparatus
A physical quantity measuring apparatus utilizing optical frequency domain reflectometry of the invention includes a tunable laser; a first polarization-maintaining fiber; a...
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7884924 |
Residual stress measuring method and system
A residual stress measuring method capable of measuring residual stress of the surface of an object to be inspected rapidly in a non-destructive non-contact manner, as well as a residual stress...
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7860297 |
Method and apparatus for detecting the deformation of objects
In a method for detecting the deformation of objects (1), a sequence of pictures of the object (1) is taken with a measurement method during the deformation of the object (1). From the pictures,...
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7782465 |
High intensity fabry-perot sensor
A method and apparatus for detecting seismic vibrations using a series of MEMS units, with each MEMS unit including an interferometer is described. The interferometers on the MEMS units receive and...
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7781725 |
Optical fiber based sensor system suitable for monitoring remote aqueous infiltration
Methods and apparatus for predicting service life of remote equipment for infiltration of liquid are disclosed. Such methods and apparatus preferably include at least one fiber optic sensor...
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7755746 |
Device for testing a test object, in particular a tire, by means of a non-destructive measuring method
A non-destructive tire testing device has at least one measuring head, a positioning means for moving the measuring head between a park position (I) and a measuring position (II), a pressure...
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7728958 |
Condition assessment method for a structure including a semiconductor material
An improved condition testing system and method includes a structure including a semiconductor material with a target portion and a second portion. The target portion has a first feature when at...
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7701586 |
Micro-optical wall shear stress sensor
Stresses and strains on a solid surface subject to a fluid flow are dynamically measured based on a shift of optical resonances of a micro-resonator. The elastic deformation and refractive index...
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7697121 |
Sensing system having wavelength reflectors that receive modulated light signals
The sensing system includes a plurality of modulators that are each configured to modulate a different light signal. The sensing system also includes optical pathways that transport the modulated...
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7636151 |
System and method for providing residual stress test structures
The invention comprises systems and methods determining residual stress such as that found in interferometric modulators. In one example, a test unit can be configured to indicate residual stress...
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7599047 |
Method and system for simultaneous measurement of strain and temperature
A method and system for simultaneously measuring strain and temperature characteristics of an object involves the attachment to the object of a pair of optical fibers having different refractive...
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7583368 |
Method of enhancing measurement of stress in glass
A detection system for measuring glass that has been placed under strain and the resulting stress lines in the glass has a light source of individual elements configured to create a light...
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7583390 |
Accelerometer comprising an optically resonant cavity
An accelerometer based on an optical displacement sensor is disclosed. An embodiment of the present invention directs a light beam toward an optically resonant cavity and detects both the reflected...
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7576347 |
Method and apparatus for optically inspecting an object using a light source
A method for inspecting an object includes emitting light from a light source, projecting the light emitted from the light source onto a surface of the object, splitting light reflected from the...
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7576840 |
Brillouin spectral measuring method and Brillouin spectral measuring apparatus
The present invention relates to a Brillouin spectrum measuring method and measuring apparatus that have a structure for more accurately measuring the parameters of Brillouin spectra at...
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7564540 |
Fibre optic sensor method and apparatus
This invention uses an interferometric fiber optic sensor, particularly a Sagnac or Michelson interferometer, in a first fiber to monitor a sensing length of the first fiber and to detect...
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7564559 |
MEMS-based, phase-shifting interferometer
Provided herein are optical devices fabricated to include a reflective surface, actuators and stress-relieving structures. Systems containing such devices, and methods of manufacturing such...
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7554674 |
Optical displacement sensor
An optical displacement sensor for sensing an environmental stimulus is disclosed. The optical displacement sensor exhibits an optical design that has suppressed back reflection and improved...
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7548319 |
Interferometric method and apparatus for measuring physical parameters
A method of measuring a selected physical parameter at a location within a region of interest comprises the steps of: launching optical pulses at a plurality of preselected interrogation...
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7542146 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
High intensity fabry-perot sensor
In a Fabry-Perot interferometer based sensor if insufficient light reflected from the sensor re-enters the fiber, the results from the Fabry-Perot interferometer-based sensor are compromised....
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7538883 |
Distributed strain and temperature discrimination in polarization maintaining fiber
A portion of a polarization maintaining (PM) optical fiber having two polarization states is analyzed. First and second spectral responses of the PM fiber portion are determined. In a preferred...
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7538859 |
Methods and systems for monitoring and obtaining information of at least one portion of a sample using conformal laser therapy procedures, and providing electromagnetic radiation thereto
In one exemplary embodiment of the present invention, method and system can be provided for obtaining information associated with at least one portion of a sample. For example, a temperature change...
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7538860 |
System and method for determination of the reflection wavelength of multiple low-reflectivity bragg gratings in a sensing optical fiber
A system and method for determining a reflection wavelength of multiple Bragg gratings in a sensing optical fiber comprise: (1) a source laser; (2) an optical detector configured to detect a...
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7538891 |
Surface characterization based on lateral shearing of diffracted wave fronts to measure in-plane and out-of-plane displacement gradient fields
Apparatus and techniques for using an optical shearing interferometry to obtain full field mapping of in-plane and out-of-plane displacement field gradients of a sample surface of a sample.
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7499151 |
Distributed Brillouin sensor system based on DFB lasers using offset locking
A distributed Brillouin sensor system is provided. The system has two distributed feedback (DFB) lasers, which are locked at the Brillouin frequency of the optical fiber through offset locking...
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7495775 |
Optical displacement sensor comprising a wavelength-tunable optical source
An optical displacement sensor is disclosed that provides a optical displacement sensor that includes a optically-resonant cavity tuned to an operating wavelength without some of the disadvantages...
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7487685 |
Strain measurement method and device
A non-contacting strain measurement method and system employs a laser light source for irradiating a test piece to provide a spectral pattern in spaced relationship from the test piece. The pattern...
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7477362 |
Moiré interferometric strain sensor
A moiré interferometric strain sensor for detecting strain on a specimen, a diffraction grating being on the specimen, the strain sensor including an array of a plurality of microlenses for ...
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7456973 |
Method and device for the contour and/or deformation measurement, particularly the interference measurement, of an object
The invention serves for the contour measurement and/or deformation measurement of an object, particularly a tire or a structural component of a composite material. The object is irradiated with...
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7433051 |
Determination of lithography misalignment based on curvature and stress mapping data of substrates
Provided are methods to be carried out prior to, while, and/or after performing a photolithographic process to a wafer that involve wafer misalignment assessment. The method involves obtaining...
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7423762 |
Rugged fabry-perot pressure sensor
A pressure sensor (100) and system for measuring pressure changes, especially in harsh environments, is described. The pressure sensor has a Fabry-Perot optical cavity formed within a tube (115)...
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7403270 |
Method for whole field thin film stress evaluation
A novel method for whole field thin film stress evaluation is provided. Through the provided method, the whole filed thin film stress distribution for an optical thin film would be developed with a...
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7377181 |
In-situ large area optical strain measurement using an encoded dot pattern
A method of measuring strain in a test specimen comprises the steps of placing a pattern of marks on a surface of the test specimen, wherein the pattern of marks includes a plurality of target...
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7357570 |
Method and device for contactless temperature monitoring and temperature adjustment
A method and device for determining the temperature of a sample, wherein a probing light beam is directed onto the sample whereby at least two partial beams of the probing light pass through paths...
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7355684 |
Interferometric signal conditioner for measurement of the absolute length of gaps in a fiber optic Fabry-Perot interferometer
A method and apparatus for quantitatively measuring the distance of an unknown variable gap is disclosed. Light is provided to two Fabry-Perot interferometers arranged in a series, one spanning the...
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7355718 |
Pressure sensor having two materials with different coefficients of thermal expansion configured to reduce temperature dependence
An interferometer pressure sensor includes a reflective film configured to change a position thereof responsive to a pressure change and an interferometer element configured to detect the position...
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7355723 |
Apparatus comprising a high-signal-to-noise displacement sensor and method therefore
An optical displacement sensor is disclosed that provides a high signal-to-noise ratio output signal without some of the disadvantages for doing so in the prior art. An embodiment of the present...
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7283216 |
Distributed fiber sensor based on spontaneous brilluoin scattering
A distributed fiber sensor based on spontaneous Brillouin scattering uses a single-frequency fiber laser as a source and a cw Brillouin fiber ring laser as an OLO to optically shift the frequency...
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7280187 |
Method for resolving phase in electronic speckle interferometry
The invention is a method of determining the phase difference between two interferometric images. The method includes the steps of measuring the intensities of the two beam arms, and measuring the...
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7268860 |
Color Moiré interferometry
Color-coding is used to simplify the prior art floating-element Moiré shear-stress sensor. The use of color-coding allows conversion of the Moiré sensor into a 2-D area array sensor, provides a s...
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7251038 |
Light source stabilisation
An apparatus for sensing data from a remote optical sensor 16 has its frequency stabilised by balancing the outputs of narrow band filter 28 30, spaced about a desired frequency 36 positioned at...
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