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| Number | Title | Issue Date |
| 8111401 | Guided-mode resonance sensors employing angular, spectral, modal, and polarization diversity for high-precision sensing in compact formats A guided mode resonance (GMR) sensor assembly and system are provided. The GMR sensor includes a waveguide structure configured for operation at or near one or more leaky modes, a receiver for input light from a source of light onto the waveguide structure to cause ... | 02/07/2012 |
| 8077323 | Optical fiber probe for an interferometric measuring device and method for manufacturing an optical fiber probe An optical fiber probe for an interferometric measuring device having a mechanical receptacle into which an optical fiber is inserted, having a fiber end piece which projects over the mechanical receptacle and contains optical components for guiding a measuring beam... | 12/13/2011 |
| 8049898 | Transducer for measuring environmental parameters Apparatus, methods, and other embodiments associated with measuring environmental parameters are described herein. In one embodiment, a transducer comprises a tube, an elongated member, a first reflective surface, a second reflective surface, and an optical fiber. T... | 11/01/2011 |
| 7933022 | Integrated optical disk resonator A method and system are disclosed for detecting the presence of a perturbation of a microresonator including the step of exciting at least first and second resonant guided optical modes of a microresonator with a light source that is in optical communication with th... | 04/26/2011 |
| 7911623 | Fabry-Perot piezoelectric tunable filter Disclosed is a microelectromechanically tunable Fabry-Perot device and method of manufacturing tunable Fabry-Perot device and method of manufacturing. The F-P device comprises a first and second substrate which has partially reflective planar surfaces, and the parti... | 03/22/2011 |
| 7880893 | Sensor apparatus and method using optical interferometry A sensor apparatus and method includes a sensor head with at least two surfaces separated by a gap. One surface is mechanically fixed, a second surface is free to move and deflections of the second surface relative to the first surface are monitored by optical inter... | 02/01/2011 |
| 7876447 | Monofibre optical meter for chemical measurement Apparatus for determining a parameter of a sample has an optical sensor in the form of a monofibre waveguide having a distal end coated with a film that is placed in a sample. The waveguide has an input channel connected to a radiation light source and an output cha... | 01/25/2011 |
| 7869053 | High temporal resolution optical sampler and sampling method An optical sampler with high temporal resolution comprises a TOAD device with a loop optical path at the inlet of which is input an optical signal to be sampled and along which path is arranged a point of input of an optical control signal produced by a source and a... | 01/11/2011 |
| 7812962 | Polarization mode dispersion measurement using an improved fixed analyzer method A device for performing polarization mode dispersion (PMD) measurements of an optical fiber is disclosed. The PMD measurement device employs a fixed analyzer method, and includes a tunable Fabry-Perot inferometer as the wavelength-selective element and an optical ba... | 10/12/2010 |
| 7787128 | Transducer for measuring environmental parameters Apparatus, methods, and other embodiments associated with measuring environmental parameters are described herein. In one embodiment, a transducer comprises a tube, an elongated member, a first reflective surface, a second reflective surface, and an optical fiber. T... | 08/31/2010 |
| 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 modulate light from two differing wavelengths by way of a multiplexi... | 08/24/2010 |
| 7728984 | Method for evaluating a measured parameter For evaluation of a measured parameter with a measuring cell having a cavity which generates for light an optical path length difference changing corresponding to the variation of the measured parameter, the method includes: introducing light from a white light sour... | 06/01/2010 |
| 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 change of a micro-resonator due to mechanical stress is exploited. With... | 04/20/2010 |
| 7602498 | Optical sensing of measurands A dome-shaped chemical sensing probe comprises an optical fiber or may be mounted on an optical fiber. The probe has a chemically sensitive measuring material which exhibits a change in volume and/or a change in refractive index in the presence of a given chemical. ... | 10/13/2009 |
| 7595890 | Porous microsphere resonators There are several different applications where it is desirable to increase the amount of material that can be introduced to the surface of a microresonator that has whispering gallery modes. The use of a porous surface on the microresonator permits greater amounts o... | 09/29/2009 |
| 7576867 | Position sensitive detectors in wavelength monitoring Particular embodiments of the present invention relate generally to wavelength monitoring in frequency doubling and other optical applications. According to one embodiment of the present invention, a system for monitoring the wavelength of a light source is provided... | 08/18/2009 |
| 7570365 | Compact tunable high-efficiency entangled photon source A compact, tunable, high-efficiency entangled photon source system that utilizes first and second periodically poled waveguides rather than bulk media in order to decrease the required pump power by up to several orders of magnitude. The first and second waveguides ... | 08/04/2009 |
| 7561277 | MEMS fiber optic microphone The theory, design, fabrication, and characterization of MEMS (micro electrical mechanical system) Fabry-Perot diaphragm-fiber optic microphone are described in the present invention. By using MEMS technology in processing and packaging, a square 1.9 mm×1.9 mm, 2 ... | 07/14/2009 |
| 7561276 | Demodulation method and apparatus for fiber optic sensors An interferometric sensing arrangement includes an interferometric sensor having an optical path length that varies depending on one or more physical parameters to be measured using the interferometric sensor. One or more light sources are used to generate light at ... | 07/14/2009 |
| 7542146 | 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. Accordingly, a sensor assembly is provided that comprises an optical fiber... | 06/02/2009 |
| 7518730 | Apparatus and method for chemical sensing A chemical detector for detecting predetermined chemicals. The chemical detector includes an optical fiber and a polymer having a high fractional free volume higher than about 0.1 that clads a length of the optical fiber. The optical fiber is arranged within an opti... | 04/14/2009 |
| 7511823 | Fiber optic sensor An apparatus, system and method are provided for measuring state properties without requiring an internal or proximate power supply. The apparatus provides a sensing device that is responsive to fluctuations in a state property that are encountered within the test z... | 03/31/2009 |
| 7492463 | Method and apparatus for continuous readout of Fabry-Perot fiber optic sensor A pressure measurement system and method are described. The system uses a tunable laser and a Fabry-Perot sensor with integrated transducer. A detector senses the light modulated by the Fabry-Perot sensor. A signal conditioner, which can be located up to 15 km away,... | 02/17/2009 |
| 7483144 | Apparatus and method for resonant chemical and biological sensing Apparatus and method are provided for chemical and biological agent sensing. The sensing apparatus includes a resonator having a resonance frequency. The resonator includes a coil of a photonic crystal fiber. The photonic crystal fiber has a solid region configured ... | 01/27/2009 |
| 7446880 | Method and apparatus for measuring and monitoring optical properties based on a ring-resonator A method and apparatus for performing refractive index, birefringence and optical activity measurements of a material such as a solid, liquid, gas or thin film. The apparatus has an optical ring-resonator with a closed optical path that constitutes a cavity. A sampl... | 11/04/2008 |
| 7443510 | Tunable laser for dynamic measurement A method for monitoring changes in a gap which corresponds to changes in a particular environmental parameter using a tunable laser and interferometer at high frequency is disclosed. The laser light provided to the interferometer is swept through a small range of wa... | 10/28/2008 |
| 7443509 | Optical and electronic interface for optically coupled resonators A method for determining a resonant frequency of an optically coupled resonator includes modulating an incident light and striking a laterally offset photodiode with the modulated incident light. An electric field is generated between the laterally offset photodiode... | 10/28/2008 |
| 7428054 | Micro-optical sensor system for pressure, acceleration, and pressure gradient measurements A micro-optical fiber tip based sensor system for pressure, acceleration, and pressure gradient measurements in a wide bandwidth, the design of which allows for multiplexity of the input side of the system is based on micro-electromechanical fabrication techniques. ... | 09/23/2008 |
| 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) with a partial reflective mirror (130) provided by... | 09/09/2008 |
| 7394547 | Fiber-optic assay apparatus based on phase-shift interferometry Apparatus and method for detecting the presence or amount or rate of binding of an analyte in a sample solution is disclosed. The apparatus includes an optical assembly having first and second reflecting surfaces separated by a distance “d” greater than 50 nm, w... | 07/01/2008 |
| 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 arranged along a curvilinear optical path. This allows for determining... | 06/10/2008 |
| 7378346 | Integrated multi-wavelength Fabry-Perot filter and method of fabrication A method is provided for forming a monolithically integrated optical filter, for example, a Fabry-Perot filter, over a substrate (10). The method comprises forming a first mirror (16) over the substrate (10). A plurality of etalon material layer... | 05/27/2008 |
| 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 least three combination, with at least three mutually different added r... | 05/06/2008 |
| 7358858 | Road-ice detecting sensor, method for installing same, and road-ice detecting method A road-ice detecting sensor includes: a temperature sensing member of T shape made of a highly heat conductive metal, having a temperature sensor to be grounded onto a road and a fin part erected from this temperature sensor; an optical fiber having an FBG bonded on... | 04/15/2008 |
| 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 change of the reflective film. A holder is configured to hold the ref... | 04/08/2008 |
| 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 unknown gap and the other spanning a controllably variable gap. Mean... | 04/08/2008 |
| 7352941 | Method and apparatus for electromagnetic resonance and amplification using negative index material An electromagnetic resonance device includes an input reflector, an output reflector, and a negative index material (NIM) disposed between the input reflector and the output reflector. The input reflector and output reflector are configured to be reflective to radia... | 04/01/2008 |
| 7340118 | Fuel injectors with integral fiber optic pressure sensors and associated compensation and status monitoring devices Fuel injectors (10) for internal combustion engines are modified and equipped with fiber optic fuel pressure sensors (12) and fiber optic combustion pressure sensors (14). The combustion pressure sensors (14) are located in separate chann... | 03/04/2008 |
| 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 the wavelength tunable laser into two directions; a reference wavelengt... | 02/19/2008 |
| 7330271 | Electromagnetic resonant sensor with dielectric body and variable gap cavity An electromagnetic resonant sensor has a dielectric sensor body through which electromagnetic wave energy is propagated. The sensor body has a cavity, with surfaces facing one another to define a gap that varies as a function of a parameter to be measured. The reson... | 02/12/2008 |
