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| Application No. | Application Title | Issue Date |
| 20110277548 | FIBER OPTIC PARTICLE MOTION SENSOR AND MEASURING METHOD USING THE SENSOR An optical sensor in which acceleration, acoustic velocity, or displacement (vibration) causes a corresponding shift in the center wavelength of the sensor output. The sensor can be coupled to a high-speed interferometric interrogator through an unbalanced fiber interfe... | 11/17/2011 |
| 20110176143 | RESONATOR LENGTH MEASUREMENT The invention provides a method and system for measuring the length of a reflective resonator, by analyzing an electromagnetic spectrum emitted therefrom. The emitted spectrum is used for estimating a first cavity length. This estimation is thereafter improved, by first... | 07/21/2011 |
| 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 ... | 07/14/2011 |
| 20110170112 | HIGH INTENSITY FABRY-PEROT SENSOR A sensor assembly having an optical fiber, a lens in optical communication with the optical fiber, a reflective surface spaced from the lens, for reflecting light from the beam back to the lens, a partially reflective surface positioned between the reflective surface an... | 07/14/2011 |
| 20110102803 | IN-LINE SINGLE FIBER MACH-ZEHNDER INTERFEROMETER A single fiber Mach-Zehnder interferometer comprises an optical fiber having a core region and a cladding surrounding the core region, and a micro-cavity having part of the cladding and the core region removed, wherein the micro-cavity is adapted to receive a light beam... | 05/05/2011 |
| 20110102804 | PASSIVELY-THERMALLY-STABILIZED PHOTONIC APPARATUS, METHOD, AND APPLICATONS Apparatus and methods that compensate for the thermally-induced drift of the resonance frequency of a closed-loop resonator include, in an exemplary embodiment, a waveguide-based Mach-Zehnder interferometer (MZI) and an overcoupled, waveguide-based microring resonator. ... | 05/05/2011 |
| 20110069318 | 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. The t... | 03/24/2011 |
| 20110064419 | OPTICAL DEVICE AND METHOD FOR OPTICAL FREQUENCY MODULATION TO OPTICAL AMPLITUDE MODULATION CONVERSION An optical device comprising an optical device comprising a Mach-Zehnder interferometer having a first 2×2 optical coupler, a second 2×2 optical coupler, a first optical arm, and a second optical arm. The first and second arms connecting corresponding pairs of optical... | 03/17/2011 |
| 20100296103 | OPTICAL MICRORESONATOR An optical microresonator system and a sensor are disclosed. The optical microresonator system includes an optical waveguide and an optical microresonator that is directly optically coupled to the optical waveguide. The optical microresonator further includes an optical... | 11/25/2010 |
| 20100284020 | PHOTONIC CRYSTAL FIBER SENSOR Apparatus and method for chemical and biological agent sensing. An example 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 to guide a... | 11/11/2010 |
| 20100243448 | DIRECT OPTICAL INTERROGATION OF AGENTS IN MICRO-FLUIDIC CHANNELS UTILIZING WHISPERING GALLERY RESONATOR APPROACH A whispering gallery mode resonator based optical sensor assembly comprises a flow channel permeable to optical energy and first and second optical waveguides adjacent to a section of the flow channel and adapted to be in first and second evanescent field couplings resp... | 09/30/2010 |
| 20100238454 | Optical MEMS Chemical Sensor Array A change in mass of a microbridge in a mass sensor can be sensed by applying a time-varying amplitude modulated electrostatic force to excite the microbridge into resonance at the frequency of amplitude modulation. An optical energy is then transmitted at a wavelength c... | 09/23/2010 |
| 20100149544 | 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 interfero... | 06/17/2010 |
| 20100085573 | SPLIT FREQUENCY SENSING METHODS AND SYSTEMS Resonant sensors and molecule detection methods utilizing split frequency. Optical energy is introduced into a microcavity, such as a toroid-shaped or spherical microcavity. A portion of the optical energy is backscattered and interacts with the introduced optical energ... | 04/08/2010 |
| 20100014094 | DISTRIBUTED GAS DETECTION A system includes a plurality of optical resonators, a light source, an optical fiber that couples the plurality of optical resonators to the light source, and a detector that is coupled to the plurality of optical resonators. The detector is configured to detect an ene... | 01/21/2010 |
| 20100007893 | Push-pull two wavelength fabry perot sensor for fiber optic acoustic sensor arrays Two optical wavelengths are used to interrogate a fiber optic Fabry-Perot sensor having a moveable diaphragm that changes the width of a gap between two reflective surfaces. By picking the right operating point for the gap, the power output for one wavelength increases ... | 01/14/2010 |
| 20090310140 | Optical Sensing Devices and Methods 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 the mi... | 12/17/2009 |
| 20090279099 | METHOD FOR FABRICATING A SENSOR, A SENSOR, AND A METHOD FOR SENSING A method for fabricating a sensor, a sensor so fabricated, and a method for sensing a stimulus are provided. The method includes providing an elongated open channel, such as, a V-groove, in a substrate, the open channel providing a first surface; removing at least some ... | 11/12/2009 |
| 20090251705 | Optical Sensing Based on Overlapping Optical Modes in Optical Resonator Sensors and Interferometric Sensors Techniques and devices based on transverse magnetic (TM) and transverse electric (TE) modes in an optical resonator or interferometer to provide sensitive optical detection with insensitivity to a change in temperature.... | 10/08/2009 |
| 20090225325 | 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, the... | 09/10/2009 |
| 20090207417 | 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 multiplexing s... | 08/20/2009 |
| 20090158853 | DIAPHRAGM PRESSURE MEASURING CELL ARRANGEMENT A diaphragm pressure measuring cell arrangement has a housing body at least partly made of sapphire material and a planar sapphire diaphragm with a peripheral edge joined by a first edge seal to the housing body to form a reference vacuum chamber. An outer surface of th... | 06/25/2009 |
| 20090086214 | ALIGNED EMBOSSED DIAPHRAGM BASED FIBER OPTIC SENSOR The present invention is a diaphragm-fiber optic sensor (DFOS), interferometric sensor. This DFOS is based on the principles of Fabry-Perot and Michelson/Mach-Zehnder. The sensor is low cost and is designed with high efficiency, reliability, and Q-point stability, fabri... | 04/02/2009 |
| 20080304076 | SYSTEMS AND METHODS FOR PACKAGING AND MOUNTING READOUT AND LASER INTENSITY MONITOR SENSORS Methods and apparatus for applying sensors to a ring laser gyro. An example apparatus includes a housing having a cavity, a laser intensity monitor (LIM) sensor mechanically and electrically connected within the cavity of the housing, and a readout sensor mechanically a... | 12/11/2008 |
| 20080212104 | 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 to g... | 09/04/2008 |
| 20080204758 | 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 optical ... | 08/28/2008 |
| 20080186506 | 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. The t... | 08/07/2008 |
| 20080049230 | 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, 2μ thi... | 02/28/2008 |
| 20080043245 | Methods and apparatus for measuring multiple fabry-perot gaps Apparatus, methods, and other embodiments associated with measuring multiple Fabry-Perot gaps to determine environmental parameters are described herein. In one embodiment, a system for measuring environmental parameters includes an optical fiber, a first reflective sur... | 02/21/2008 |
| 20070291275 | Side-viewing optical acoustic sensors and their use in intravascular diagnostic probes One aspect of the invention provides side-sensing optical fiber-based optical acoustic sensors that are well suited to catheter-based intravascular diagnostic applications. Another aspect of the invention provides intravascular probes, such as catheters, that include a ... | 12/20/2007 |
| 20070223000 | Optical Sensor An optical sensor having a sapphire body is disclosed. A hollow in the sapphire body defines a surface which is used as a surface of a Fabry-Perot cavity. Interferometry is used to detect changes in the length of the Fabry-Perot cavity, and hence changes in, for example... | 09/27/2007 |
| 20070165238 | 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 thre... | 07/19/2007 |
| 20070159638 | OPTICAL SIGNAL MEASUREMENT SYSTEM An optical signal measurement system provides a tunable optical filter. An unknown optical signal is scanned through the tunable optical filter. The wavelength and chromatic dispersion values of the unknown optical signal scanned through the tunable optical filter are m... | 07/12/2007 |
| 20070115480 | Multi-cavity fabry-perot interferometric thin-film sensor with built-in temperature compensation A fiber optic sensor includes at least two Fabry-Perot (FP cavities) defined by at least three partially reflecting surfaces which individually and together are capable of generating different interference spectra which are affected by temperature. One of the FP cavitie... | 05/24/2007 |
| 20070109550 | System and deconvolution process for an optical filtering device based on WGM resonance A system and method for detecting the optical spectrum of an optical input signal. The system includes a tunable optical filter having a microresonator that is tunable across a plurality of states and a processor. The input signal is coupled into the microresonator, whi... | 05/17/2007 |
| 20070041019 | 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 an ... | 02/22/2007 |
| 20070035741 | Temperature stabilized single mode fiber connectors in semiconductor source spectroscopy system A method and system for controlling the temperature of the single mode fiber connectors and single mode, polarization maintaining fiber connectors, which that are used in the semiconductor source spectroscopy systems, is described to stabilize the system against baselin... | 02/15/2007 |
| 20070013914 | CRYSTALLINE OPTICAL FIBER SENSORS FOR HARSH ENVIRONMENTS A diaphragm optic sensor comprises a single crystal ferrule, preferably single crystal sapphire, including a bore having an optical fiber disposed therein and a diaphragm attached to the ferrule, the diaphragm being spaced apart from the ferrule to form a Fabry-Perot ca... | 01/18/2007 |
| 20060244970 | 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 reflect... | 11/02/2006 |
| 20060238775 | 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 wavele... | 10/26/2006 |
