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Match Document Document Title
7426021 Interferometric optical analyzer and method for measuring the linear response of an optical component  
An interferometric optical analyzer apparatus comprises a light source, an interferometer and a detection system for determining the linear response, and subsequently any optical parameter, of one...
7414728 Reconfigurable polarization independent interferometers and methods of stabilization  
A polarization independent (PI) interferometer design that can be built from standard optical components is described. Based upon a Michelson interferometer, the PI interferometer uses a 50/50...
7385706 Method and apparatus for determining the nonlinear properties of devices and fibers  
A method and apparatus are provided for measuring samples of the electric field of light propagated through a device under test and determining a nonlinear property of the device, such as...
7385177 Light guide rotation rate detector with coupled optical resonators  
A method and device are presented for use in determining a rate of rotation of an object. The device comprises a light guide comprising an arrangement of a plurality of coupled optical resonators...
7375818 Optical tomography system  
In an optical tomography system for obtaining a tomographic image of an object to be measured by detecting interference light of the reflected light and the reference light, a controller switches...
7375817 Counting signal processing method for fiber optic interferometric sensor  
A counting signal processing method for a fiber optic interferometric sensor including following steps is provided. An output intensity of the fiber optical interferometric sensor is converted into...
7369249 Apparatus for measuring differential mode delay of multimode optical fiber  
Disclosed herein is an apparatus for measuring the differential mode delay of multimode optical fiber. The apparatus includes a tunable laser source, an interferometer, a data collecting device,...
7369248 Device for measuring an optical path length difference  
In measuring an optical path length difference, light from a light source is guided through a first and a second path. A three-way coupler combines light from the first and the second path in at...
7359060 Multi-mode sampling probes  
An optical probe for use in infrared, near infrared, Raman, and other spectrometers includes a probe outer surface with a cavity defined therein. The probe emits light into a sample via emission...
7349097 Interferometric determination of a transfer function of a device under test  
A method of evaluating a device under test (DUT) includes detecting four interferograms of the DUT including two orthogonal detections and two orthogonal input polarizations, performing a Hilbert...
7333680 Fiber Bragg grating sensor system  
The present invention discloses a fiber Bragg grating sensor system. The system according to the present invention comprises a wavelength tunable laser; a coupler for splitting output light from...
7333210 Method and apparatus for feedback control of tunable laser wavelength  
A method and system for controlling the wavelength of light emitted by a tunable laser. The system includes a wavelength tuner that provides information of a desired wavelength; a coupler for...
7327462 Method and apparatus for direct detection of signals from a differential delay heterodyne interferometric system  
A direct detection method and apparatus for a fiber optic acoustic sensor array systems using an in-line Michelson sensor TDM array and an interferometric section having two acousto-optic...
7307732 Photonic crystal interferometer  
A sensor apparatus comprising a photonic crystal structure optically coupled to a laser, the photonic crystal structure comprising a beam splitter, an interferometer having a reference arm and a...
7305158 Interferometric signal conditioner for measurement of absolute static displacements and dynamic displacements of a Fabry-Perot interferometer  
A signal conditioner to measure the length of an interferometric gap in a Fabry-Perot sensor (interferometer). The invention includes a light source, a Fabry-Perot interferometer capable of...
7304744 Apparatus and method for measuring the thickness of a thin film via the intensity of reflected light  
A thin film thickness measurement apparatus that can measure immediately after film growth thickness of a thin film of a substrate that is grown includes a light receiving/projecting unit directing...
7289221 Mach Zehnder photonic crystal sensors and methods  
A sensor apparatus includes a photonic crystal structure including a Mach Zehnder interferometer with a reference arm and a sensor arm configured to provide an evanescent field through a sensed...
7283247 Optical probe system  
An optical probe system comprises an optical probe that is inserted into a body cavity, a light source that generates light which is irradiated to an object, and a high-magnification observation...
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...
7281428 Diagnostic system for monitoring structural health conditions  
Interrogation systems for monitoring structural health conditions. An interrogation system includes at least one wave generator for generating a wave signal and optical fiber sensors applied to a...
7280265 Interferometric modulation of radiation  
An Interferometric Modulator (IMod) is a microelectromechanical device for modulating light using interference. The colors of these devices may be determined in a spatial fashion, and their...
7280221 High efficiency low coherence interferometry  
In accordance with the present invention, embodiments of interferometers are presented that improves both the polarization dependency problem and helps prevents light from being reflected back into...
7280219 System for monitoring sealing wear  
A system for determining at least one condition of a seal including an optical fiber for transmitting light from a light source. The optical fiber is embedded in the seal and operatively coupled to...
7280216 Method and apparatus for determining the wavelength of an input light beam  
A method and apparatus for measuring the wavelength of an input light beam whereby the input light beam is split into two light beams which are directed through two paths of different optical...
7269537 Infrasound sensor with disturbance filtering  
The invention pertains to the sensing and measurement of infrasound (pressure variations with frequency content under 10 Hertz). The invention measures the infrasound pressure variations and then...
7268884 Wavelength reference system for optical measurements  
Devices and methods of accurately determining optical wavelengths, such as the Bragg wavelengths of an FBG sensor array. Wavelength-swept light having a characteristic spectrum is swept over a...
7262905 Optical amplifier  
An optical amplifier includes a first optical path, second optical path, semiconductor optical amplifier, and multi-mode interference 3-dB coupler. The first optical path guides oscillation light....
7253906 Polarization state frequency multiplexing  
A method for the rapid measurement of polarization dependent properties of an optical device under test uses a novel technique to generate light in four different polarization states in which each...
7245382 Downhole optical sensor system with reference  
Embodiments of the present invention generally provide methods, apparatus, and systems for compensating for frequency fluctuations in source light used to interrogate an optical sensor. The optical...
7243543 Highly sensitive accelerometer  
Accelerometers for determining acceleration and methods of fabricating an accelerometer are disclosed. In one embodiment, the accelerometer includes a frame, a mass movably suspended on the frame,...
7239396 Method and apparatus for directly measuring the phase change of an optical signal  
This invention relates to a method and apparatus for measuring the phase change of an output optical signal from a device. In one embodiment an input optical signal is split into first and second...
7233399 Feedback control of an interferometer  
The invention proposes a method for feedback control, in which a portion of a data signal is split and rectified and the signal intensity is detected with slow speed electronics for improving the...
7197931 Sensors for monitoring structural health conditions  
Sensors and systems for monitoring structural health conditions. The present invention provides a device for monitoring structural health conditions including a dielectric substrate, a...
7197210 Method and device for determining and compensating for the tilting of the spectrum in an optical fiber of a data transmission path  
A method is provided for determining and setting the tilting of the spectrum of light signals in an optical fiber of an optical data transmission path having at least one part for varying the...
7180602 Agile spectral interferometric microscopy  
An agile optical sensor based on spectrally agile heterodyne optical interferometric confocal microscopy implemented via an ultra-stable in-line acousto-optic tunable filter (AOTF) based...
7180599 Polarization effect averaging  
In order to reduce polarization dependent error, the polarization state of incident light is set to at least two different states of polarization, and a first optical property is determined...
7177491 Fiber-based optical low coherence tomography  
Generally, and in one form of the present invention, is a polarization-maintaining fiber-based polarization sensitive optical low coherence reflectometer for depth resolved birefringence...
7164478 Apparatus and methods for stabilization and control of fiber devices and fiber devices including the same  
A mounting platform provides support and packaging for one or more fiber Bragg gratings and electronic circuitry (e.g., heaters, coolers, piezoelectric strain providers, temperature and strain...
7158240 Measurement device and method  
Apparatus for determining the thickness of a configuration having flat, parallel surfaces that are transparent, or nearly so, to pre-specified types of energy. Embodiments comprise a mechanism for...
7145660 Micro-resonator based optical sensor  
An optical sensor system for providing an output signal in response to a sensed parameter is disclosed. The sensor system comprises an optical signal source generating an input signal, a sensing...
7142309 Method and device for measuring half-wave voltage of Mach-Zehnder type optical modulator  
A method and a device for measuring the half-wave voltage of a Mach-Zehnder type optical modulator accurately and without depending on the bias variation of an optical modulator. The method of...
7130058 System and method for determining coordinates on three-dimensional space using beam phase interference  
Disclosed are a system and a method for determining coordinates of a three-dimensional measurer probe using a beam phase interference method. Two optical fibers are mounted inside the probe, and...
7119325 System and method for monitoring environmental effects using optical sensors  
An apparatus and method for determining a physical parameter affecting an optical sensor or a number of sensors in a network. The apparatus uses a narrow linewidth source at an emission wavelength...
7110119 Determining an optical property by using superimposed delayed signals  
An optical property of a device under test is determined from a detected DUT response signal, or a signal derived therefrom, whereby the DUT response signal represents a signal response of the DUT...
7106450 Determination of a device signal response characteristic using multiple varied signals  
For determining a signal response characteristic of a device, a first signal is varied with a first function of time and simultaneously a second signal is varied with a second function of time,...
7106449 Systems and methods for fiber optic devices with reduced thermal sensitivity  
An optical fiber device with reduced thermal sensitivity comprises a first optical fiber arm having a first composite coefficient of thermal expansion and a first length and a second optical fiber...
7075286 Fiber-optic current sensor  
An optical current sensor having a reflection interferometer ( 1, 10 ) has, in its fiber-optic lead ( 2 ), a polarization-maintaining first fiber branch ( 20 ) for two forward-traveling...
7072044 Apparatus for acoustic detection of particles in a flow using a fiber optic interferometer  
Fiber optic particle detector for measurements in a fluid flow, comprising an optical fiber ( 2,3,12 ) being acoustically coupled to a mechanical element ( 11,13,14 ) adapted to be acoustically...
7064840 Optical sampling system for simultaneously monitoring intensity modulation and frequency modulation  
The optical sampling system performs by detecting the interference effect which is a linear correlation between the signal lights and the optical pulses, so that both the signal lights and the...
7064839 Optical phase standard  
An optical phase standard includes a coupler dividing an applied optical signal between a measurement interferometer and a frequency reference branch. Resulting signals at the outputs of the...
Matches 1 - 50 out of 455 1 2 3 4 5 6 7 8 9 10 >