With Light Beam Indicator Patents (Class 73/655)
  • Patent number: 10813555
    Abstract: Method and apparatus can be provided according to an exemplary embodiment of the present disclosure. For example, with at least one first section of an optical enclosure, it is possible to provide at least one first electro-magnetic radiation. In addition, with at least one second section provided within the enclosure, it is possible to cause, upon impact by the first radiation, a redirection of the first radiation to become at least one second radiation. Further, with at least one third section of the optical enclosure, it is possible to cause at least one second radiation to be provided to a tissue. For example, the redirection of the first radiation causes, at least approximately, a uniform optical illumination on of a surface of the tissue.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: October 27, 2020
    Assignee: The General Hospital Corporation
    Inventors: Li Li, Guillermo J. Tearney
  • Patent number: 10787323
    Abstract: The invention relates to an apparatus for vibration measurement on a machine, having a base plate for mounting on a measurement point of the machine, a magnetic retaining device for holding the base plate at the measurement point by magnetic force, a sensor for detecting vibrations, arranged on or in contact with the base plate, a sensor for detecting the magnetic flux density in the area of the retaining device, and a monitoring device for monitoring the coupling of the base plate to the measurement point by evaluating the detected magnetic flux density.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: September 29, 2020
    Assignee: Prüftechnik Dieter Busch AG
    Inventor: Christoph Mair
  • Patent number: 10791400
    Abstract: According to the present invention, there is provided an electroacoustic transducer, comprising: a first electrode; a second electrode; a piezoelectric material at least partially sandwiched between the first electrode and the second electrode; and an optical aperture extending through the electroacoustic transducer, to allow for optical communication to take place through the electroacoustic transducer.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: September 29, 2020
    Assignee: BAE SYSTEMS plc
    Inventor: Lionel William John Kent
  • Patent number: 10768059
    Abstract: An optical probe for a gas turbine engine includes a housing. Also included is a plurality of optical fibers, a portion of each of the optical fibers secured to fiber holders. Further included is an optical head disposed within the housing and having channels extending in a longitudinal direction of the optical head, the fiber holders disposed within the channels. Yet further included is a cap disposed within the housing and operatively coupled to the optical head, the plurality of optical fibers extending through the cap. Also included is an inner tube operatively coupled to the cap, the plurality of fibers extending through the inner tube.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: September 8, 2020
    Assignee: RAYTHEON TECHNOLOGIES CORPORATION
    Inventors: Eli Cole Warren, Michael F. Sabol
  • Patent number: 10684162
    Abstract: A vibration sensing optical fiber cable is provided. The cable includes at least one optical fiber embedded in the cable jacket such that vibrations from the environment are transmitted into the cable jacket to the optical fiber. The cable is configured in a variety of ways, including through spatial arrangement of the sensing fibers, through acoustic impedance matched materials, through internal vibration reflecting structures, and/or through acoustic lens features to enhance sensitivity of the cable for vibration detection/monitoring.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: June 16, 2020
    Assignee: CORNING RESEARCH & DEVELOPMENT CORPORATION
    Inventors: Riley Saunders Freeland, Michael John Gimblet, Jason Clay Lail, James Arthur Register, III, David Alan Seddon
  • Patent number: 10684622
    Abstract: The present disclosure is directed to a vehicle dynamics monitor for an autonomous vehicle. In particular, the systems and methods of the present disclosure can determine, based on data received from one or more sensors of an autonomous vehicle, that an anomaly exists in an interface between at least one tire of the autonomous vehicle and a road surface. Responsive to determining that the anomaly exists: a motion plan for the autonomous vehicle that takes into account the anomaly can be determined; and one or more controls of the autonomous vehicle can be interfaced with to implement the motion plan.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: June 16, 2020
    Assignee: UATC, LLC
    Inventors: Sean McNeil, Aaron L. Greenfield
  • Patent number: 10638935
    Abstract: An optoacoustic imaging system includes a handheld probe and first and second pulsed light sources having a common output. The first and second light sources generate pulses of light at first and second predominant wavelengths, respectively. The handheld probe includes an ultrasound transducer array having an active end located at the distal end of the handheld probe for receiving an optoacoustic return signal. A sensor measures a portion of the light transmitted along the light path. A data acquisition samples the ultrasound transducer array during a predetermined period of time after a pulse of light from the first light source and during a predetermined period of time after a pulse of light from the second light source. The sampled data is stored.
    Type: Grant
    Filed: March 20, 2019
    Date of Patent: May 5, 2020
    Assignee: Seno Medical Instruments, Inc.
    Inventors: Jason Zalev, Bryan Clingman, Donald G. Herzog
  • Patent number: 10509112
    Abstract: A laser system is provided. The laser system comprises: a seed laser configured to produce a sequence of seed light pulses, wherein the sequence of seed light pulses are produced with variable time intervals in a sweep cycle; a pump laser configured to produce pump light having variable amplitude in the sweep cycle; and a control unit configured to generate a command to the pump laser to synchronize the pump light with the sequence of seed light pulses.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: December 17, 2019
    Assignee: HESAI PHOTONICS TECHNOLOGY CO., LTD.
    Inventor: Zhengqing Pan
  • Patent number: 10113861
    Abstract: Methods and systems are disclosed for measuring multidimensional stress characteristics in a substrate. Generally, the methods include applying a sequence of optical pump pulses to the substrate. The optical pump pulses induce a propagating strain pulse in the substrate. Optical probe pulses are also applied. By analyzing transient optical responses caused by the propagating strain pulse, multidimensional stress components characterizing the stress in the substrate can be determined. Multidimensional stress components may also be determined at a depth of a substrate. Multidimensional stress components may also be determined at areas adjacent a through-silicon via.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: October 30, 2018
    Assignee: BROWN UNIVERSITY
    Inventor: Humphrey J. Maris
  • Patent number: 10107651
    Abstract: Methods and systems for Brillouin optical time-domain reflectometry include optically filtering out non-Brillouin signals reflected from a fiber. Brillouin signals reflected from the fiber are coupled with a local oscillator to produce a Brillouin shift signals. The Brillouin shift signals are converted to an electrical domain using a photodetector. The electrical Brillouin shift signals are converted to a digital domain using a low-speed analog-to-digital converter that has a sampling rate below a Nyquist rate sufficient to fully resolve the electrical Brillouin shift signals.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: October 23, 2018
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Shaoliang Zhang, Ezra Ip, Yue-Kai Huang, Giovanni Milione
  • Patent number: 9945386
    Abstract: A system and method for detecting the rotation breakaway of a spacer from a compressor rotor disk are disclosed herein. The method includes detecting a disk sensed feature and a spacer sensed feature on the compressor rotor disk and the spacer respectively. The method also includes comparing the timing between the two to a predetermined threshold to determine whether the relative position of the spacer to the compressor rotor disk exceeds a predetermined amount. The predetermined amount may be selected to determine whether an imbalance, rubbing, or binding can occur in the gas turbine engine or to determine whether anti-rotation features have been broken.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: April 17, 2018
    Assignee: Solar Turbines Incorporated
    Inventors: David Tai Wai Lee, Kwok-Kwong Ben Tse, Kenneth Gregory Thomas, Ching Kai Chan, Jorge Hernandez-Maldonado
  • Patent number: 9778229
    Abstract: Provided are an apparatus and a method for measuring a nonlinearity parameter using laser, and more particularly, an apparatus and a method for measuring a nonlinearity parameter using laser for computing the nonlinearity parameter by irradiating laser of a toneburst signal on a surface of a sample by non-contact type laser so as to excite the sample, irradiating measurement laser beam on the surface of the sample so as to receive displacement information occurring on the surface of the sample over time, measuring the displacement in an interferometer principle, and performing a bandpass filtering for the measured signal so as to measure amplitude A1 of a component of a fundamental frequency and amplitude A2 of a component of a secondary harmonic wave.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: October 3, 2017
    Assignee: KOREA ATOMIC ENERGY RESEARCH INSTITUTE
    Inventors: To Kang, Jin-Ho Park, Doo-Byung Yoon, Soon-Woo Han, Jang-Soo Lee
  • Patent number: 9719846
    Abstract: An example system for detecting mud pulses may include a distributed acoustic sensing (DAS) data collection system coupled to a downhole drilling system, and an information handling system communicably coupled to the DAS data collection system. The information handling system may include a processor and memory coupled to the processor. The memory may contain a set of instructions that, when executed by the processor, cause the processor to receive quadrature DAS data signals from the DAS data collection system, determine a first template signal associated with mud pulses, transform the determined first template signal into analytic representation form, perform a matched filter operation using the quadrature DAS data signals and the transformed first template signal, and analyze an output signal of the matched filter operation to detect mud pulses in the downhole drilling system.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: August 1, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Andreas Ellmauthaler, Leonardo de Oliveira Nunes, Neal Gregory Skinner, Christopher Lee Stokely, David Andrew Barfoot
  • Patent number: 9528387
    Abstract: A method of determining rotor blade axial displacement (bij). The rotor blade tip (34) comprises first and second measurement features (36, 38) arranged to make an acute angle therebetween. Measure time of arrival (tijk) of the once per revolution feature (1), first and second edges (40, 42) of the first measurement feature (36), and first and second edges (44, 46) of the second measurement feature (38), for at least two revolutions of the rotor (2). Convert these to circumferential distances (dijk) for each revolution. Calculate a feature angle (?ijk) between each measurement feature (36, 38) and the once per revolution feature (1) for each revolution. Calculate blade untwist angle (?ij) from the change in feature angle (?ijk) between measured revolutions. Calculate the rotor blade axial displacement (bij) from the blade untwist angle (?ij) and the circumferential distance (dijk) of the point from one of the measurement features (36, 38).
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: December 27, 2016
    Assignee: ROLLS-ROYCE plc
    Inventor: Olivier Y J P Jousselin
  • Patent number: 9366586
    Abstract: An optical probe includes a first end, a second end, an outer housing, an inner housing concentric with the outer housing, flow holes within the inner housing at the first end, and an optics holder within the inner housing between the flow holes and the second end. The optical probe further includes high temperature optical lenses inside the optics holder between the flow holes and the second end, fiber holders inside the optics holder between the high temperature optical lenses and the second end, optical fibers coated in a high temperature material extending from inside fiber holders towards the second end, and a high temperature adhesive for securing the optical fibers, the fiber holders, and the high temperature optical lenses.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: June 14, 2016
    Assignee: United Technologies Corporation
    Inventors: Eli Cole Warren, Benjamin D. Cyr
  • Patent number: 9250112
    Abstract: The application describes techniques for monitoring the rate of flow of fluid in a conduit (205) using fiber optic distributed acoustic sensing which are especially applicable to flow in oil and gas wells. The techniques also allow for calibration of the position of the channels of a fiber optic distributed acoustic sensor arranged along a fluid carrying conduit. The techniques comprise introducing a first acoustic stimulus (303) travelling in one direction and a second acoustic stimulus (304) travelling in the opposite direction. Flow of the fluid (v) results in a difference in the propagation velocity of the two acoustic stimuli. The first and second acoustic stimuli create a standing wave and the beat effect due to the flow induced wavelength variation is detected and used to determine flow rate. The acoustic stimulus may be introduced to travel through the conduit to provide the first stimulus and to reflect from the end of the conduit and travel back as the second acoustic stimulus.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: February 2, 2016
    Assignee: OPTASENSE HOLDINGS LIMITED
    Inventor: Alastair Godfrey
  • Patent number: 9091155
    Abstract: Reducing disturbance during fiber optic sensing. An in-well fiber optic sensing system includes a device insulated to be disturbance-resistant. The device is in a fiber optic communication path between a source and a target configured to be received in a well. The device is configured to receive a parameter sensing signal transmitted from the source to the target and produce a reference signal. The fiber optic sensing system includes a signal interrogation system connected to the device in the fiber optic communication path. The signal interrogation system is configured to receive the reference signal from the device and to receive a response signal from the target in response to the parameter sensing signal. The response signal represents the parameter of interest. The signal interrogation system is configured to determine the parameter of interest based, in part, on the reference signal and the response signal.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: July 28, 2015
    Assignee: Halliburton Energy Services, Inc.
    Inventor: David Andrew Barfoot
  • Patent number: 9080949
    Abstract: A Distributed Acoustic Sensing(DAS) fiber optical assembly comprises adjacent lengths of optical fiber A, B with different directional acoustic sensitivities, for example by providing the first length of optical fiber A with a first coating 35, such as acrylate, and the second length of optical fiber B with a second coating 36, such as copper, wherein the first and second coatings 35 and 36 may be selected such that the Poisson's ratio of the first length of coated fiber A is different from the Poisson's ratio of the second length of coated fiber B. The different Poisson's ratios and/or other properties of the adjacent lengths of optical fiber A and B improve their directional acoustic sensitivity and their ability to detect broadside (radial) acoustic waves.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: July 14, 2015
    Assignee: Shell Oil Company
    Inventors: Jeffery Joseph Mestayer, Peter Berkeley Wills
  • Patent number: 9051897
    Abstract: An aircraft jet engine system includes at least one gas turbine engine having a fan including a rotor and a plurality of fan blades. A sensor system in the fan section senses information about the operation of the blades and provides feedback on the condition of each blade to a control. The control is programmed to take in the sensed information and identify a safe operating range for the gas turbine engine based upon damage information developed from the sensed information with regard to each of the blades. An aircraft jet engine system incorporating a plurality of gas turbine engines wherein safe operating ranges are developed for each of the gas turbine engines is also disclosed as is a method of operating an aircraft jet engine system.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: June 9, 2015
    Assignee: United Technologies Corporation
    Inventors: Frederick M. Schwarz, Coy Bruce Wood
  • Publication number: 20150143913
    Abstract: Apparatuses and methods for detecting hidden or modified objects in a vehicle are disclosed. Embodiments include detection of vehicle irregularities, such as irregularities in the acoustical response of a vehicle tire as the tire rolls over a surface, irregularities in the orientation of the vehicle body, the response of a vehicle component (such as an axle, wheel, tire, etc.) to the vehicle moving over a surface, and the response of a vehicle component to vehicle generated vibrations. In alternate embodiments subsystems detecting different irregularities communicate with one another.
    Type: Application
    Filed: January 22, 2013
    Publication date: May 28, 2015
    Applicant: Purdue Research Foundation
    Inventor: Purdue Research Foundation
  • Publication number: 20150135841
    Abstract: Provided are a capacitive transducer that can make a sealing film thickness necessary to seal a gap smaller and can enhance performance such as a wider bandwidth, and a method of manufacturing the capacitive transducer. The capacitive transducer including cells each including a vibration film including a second electrode that is provided with a gap from a first electrode can be manufactured in the following manufacturing method. A convex part is formed on the first electrode, a sacrifice layer having a thickness larger than the thickness of the convex part is formed on the first electrode and the convex part, and a membrane is formed on the sacrifice layer. Further, an etching hole is formed in the membrane at a position above the convex part, the sacrifice layer is etched through the etching hole, and the etching hole is sealed by a sealing layer.
    Type: Application
    Filed: October 27, 2014
    Publication date: May 21, 2015
    Inventor: Kazuhiko Kato
  • Publication number: 20150122036
    Abstract: A photoacoustic wave measurement device according to the present invention includes: an optical fiber that outputs pulsed light; an external spacer that is disposed between a pulsed-light output end of the optical fiber and a measurement object, and which is adapted to allow the pulsed light to pass therethrough; a piezoelectric element that receives a photoacoustic wave generated by the pulsed light from the measurement object and converts the photoacoustic wave into an electric signal; and a spacer that is disposed between the external spacer and the piezoelectric element, and which is adapted to allow the photoacoustic wave to pass therethrough. The piezoelectric element is farther from the measurement object than the pulsed-light output end. A part of the optical fiber is disposed within the spacer.
    Type: Application
    Filed: July 19, 2013
    Publication date: May 7, 2015
    Applicant: ADVANTEST CORPORATION
    Inventor: Taiichiro Ida
  • Publication number: 20150114127
    Abstract: An illustrative distributed acoustic sensing system includes a multi-mode optical fiber cable for distributed sensing and a distributed acoustic sensing interrogator coupled to the multi-mode optical fiber cable via a single mode optical fiber. The interrogator derives distributed acoustic measurements from Rayleigh backscattering light that is initiated with a substantially under-filled launch configuration that is designed to excite only the lowest-order modes of the multi-mode optical fiber. Mode conversion within the multi-mode optical fiber is anticipated to be negligible. For elastic scattering (i.e., Rayleigh scattering), it is further anticipated that the scattered light will be primarily returned in the incident propagation mode, thereby escaping the extraordinarily large coupling loss that would otherwise be expected from coupling a single-mode optical fiber to a multi-mode optical fiber for distributed sensing. Experiments with graded index multi-mode optical fiber have yielded positive results.
    Type: Application
    Filed: October 31, 2013
    Publication date: April 30, 2015
    Inventors: David A. BARFOOT, John L. MAIDA
  • Patent number: 9000909
    Abstract: A system and method of providing a protective cover to occupants of a room, which includes detecting an occurrence of a threatening event with a protection system deployed in the room, such as detecting gunfire with the protection system and/or receiving a transmitted command of the threatening event by the protection system, and emitting an obscuring haze into the room from a haze generator of the protection system in response to the detected occurrence of the gunfire. The emitted obscuring haze obscures the light of sight contact between a shooter and the occupants in the room, which provides a measure of cover for the occupants while other assistance is being organized. This reduces the chances that the shooter will be able to accurately shoot any victim, increasing the odds of victim survival.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: April 7, 2015
    Assignee: Convey Technology, Inc.
    Inventors: Cynthia Trempel Batchelder, J. Samuel Batchelder, Luke Batchelder, James Batchelder
  • Patent number: 8991261
    Abstract: An acoustic wave measuring apparatus includes a light source for radiating a light having a wavelength component in wavelength areas, light filters arranged in a light path from the light source to a subject and each to shut off or transmit the light in one of the wavelength areas, a detector for detecting an acoustic wave generated by the radiation, a controller for generating conditions having different combinations of the wavelength components contained in the light, and a signal processor for calculating an optical absorption coefficient of the subject for the light in each wavelength area based on a pressure of the acoustic wave detected under each of the conditions and a strength of the radiated light for each wavelength area under conditions.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: March 31, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasufumi Asao
  • Publication number: 20150082891
    Abstract: A system and method for measuring the vibration of a structure of interest are disclosed. The disclosure provides an acoustic isolation structure to substantially reduce response to acoustic energy generated by external physical stimuli. The acoustic isolation structure is formed by placing a housing, such as an outer conduit, around an inner conduit, forming a gap between the housing and the inner conduit. The gap is then configured to serve as an acoustic isolation layer by either filling the gap with an acoustic isolation material or by substantially evacuating the gap and sealing the ends thereof.
    Type: Application
    Filed: August 20, 2014
    Publication date: March 26, 2015
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Daniel Boyd Cooper, Erik N. Lee
  • Publication number: 20150075275
    Abstract: An acoustic sensing system includes, an optical fiber, a plurality of pairs of reflectors distributed along the optical fiber at specific areas where acoustic energy data is sought, a source of coherent radiation in operable communication with the optical fiber, and a detector in operable communication with the optical fiber configured to detect a different wavelength of coherent radiation reflected from each of the plurality of pairs of reflectors including a portion of the coherent radiation reflected from the reflector nearer the detector after having reflected from the reflector further from the detector that define one of the pairs of reflectors.
    Type: Application
    Filed: September 16, 2013
    Publication date: March 19, 2015
    Applicant: BAKER HUGHES INCORPORATED
    Inventor: Daniel Boyd Cooper
  • Publication number: 20150075287
    Abstract: An optoacoustic system includes first and second light sources capable of generating pulse of light at first and second wavelengths, optical output control, first and second light sync detectors, and a combiner. A power meter that is calibrated to determine power at the first and second predominant wavelength measures power at the first wavelength after the first light sync is detected and measures power at the second wavelength after the second light sync is detected. The system includes a calibration mode wherein it reduces optical output of the first light source when the power measured by the power meter at the first wavelength after the first light sync is detected is above a first level, and reduces optical output of the second light source when the power measured by the power meter at the second wavelength after the second light sync is detected is above a second level.
    Type: Application
    Filed: July 11, 2014
    Publication date: March 19, 2015
    Applicant: SENO MEDICAL INSTRUMENTS, INC.
    Inventors: Donald G. Herzog, Elisa Gravis, Bryan Clingman, Remie J. Smith, Thomas G. Miller
  • Publication number: 20150075288
    Abstract: A photoacoustic wave measurement device includes a pulsed-light outputter, an arrangement member and a photoacoustic wave detector. The pulsed-light outputter outputs a pulsed light. The arrangement member is disposed between a pulsed-light output end of the pulsed-light outputter and a measurement object, the arrangement member being adapted to allow the pulsed light to pass therethrough. The photoacoustic wave detector receives a photoacoustic wave generated by the measurement object by the pulsed light and converts the photoacoustic wave into an electric signal. The photoacoustic wave detector is farther from the measurement object than the pulsed-light output end. The arrangement member has such a sufficient thickness that noise to be detected by the photoacoustic wave detector after a start time of detection of the photoacoustic wave starts to be detected after an end time of the detection of the photoacoustic wave.
    Type: Application
    Filed: May 2, 2013
    Publication date: March 19, 2015
    Inventor: Taiichiro Ida
  • Publication number: 20150059481
    Abstract: A system (100) for determining a property of an object (106) comprises an inducing arrangement (102), a detector (104) and a processor. The inducing arrangement (102) is configured to generate an impulse of fluid and for directing the impulse of fluid towards the object to induce a physical vibration of the object (106). The inducing arrangement (102) does not contact the object 106 when inducing the physical vibration of the object (106). The detector (104) is configured to detect the physical vibration of the object (106). The detector (104) does not contact the object 106 when detecting the physical vibration of the object (106). The processor is coupled to the detector (104) for determining the property of the object (106) based on at least the detected physical vibration.
    Type: Application
    Filed: February 21, 2013
    Publication date: March 5, 2015
    Inventors: Peter Niven Schaare, Roderick Munro McDonald, Vincent Andrew McGlone
  • Publication number: 20150053016
    Abstract: Systems and techniques are provided for transmitting a light towards a plurality of acousto-optic retro reflectors, arranged as an array, that are configured to physically react to an acoustic signal. The physical reaction modulates the transmitted light which is reflected back towards a light detector and analyzed. The analysis may include detecting an acoustic signal source location and/or reconstructing the acoustic signal. A light scanner may be configured to transmit the light towards the plurality of acousto-optic retro reflectors in a predetermined, continuance, or dynamically determined sequence.
    Type: Application
    Filed: August 23, 2013
    Publication date: February 26, 2015
    Applicant: Google Inc.
    Inventor: Michael Sleator
  • Publication number: 20150033866
    Abstract: An optical sensor is proposed. The optical sensor comprises a first substrate, a second substrate, a membrane, and an optical gate. The first substrate has a concave structure having a first optical micro-reflection surface and a second optical micro-reflection surface formed thereon. The second substrate has a second concave structure having a third optical micro-reflection surface and a fourth optical micro-reflection surface formed thereon. The optical gate is disposed on the membrane within the first concave structure. The membrane is disposed between the first substrate and the second substrate.
    Type: Application
    Filed: August 1, 2014
    Publication date: February 5, 2015
    Inventors: Mao-Jen Wu, Chia-Chi Chang
  • Patent number: 8935960
    Abstract: A kit for detecting the presence of an explosive includes a pulsed focused energy source located at a target distance away from a substrate, the energy having a magnitude sufficient to release the internal energy of an explosive if present on the substrate and thereby generate an acoustic wave. The kit also includes a detector adapted to detect the acoustic wave at a detection distance away from the substrate.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: January 20, 2015
    Assignee: Massachusetts Institute of Technology
    Inventors: Charles M. Wynn, Robert W. Haupt, Sumanth Kaushik, Stephen T. Palmacci
  • Publication number: 20150013465
    Abstract: This application relates to conditions monitoring of structures forming part of a transport network, e.g. structural health monitoring of structures, especially tunnels. The method involves performing distributed acoustic sensing (DAS) on at least one optical fibre (104) deployed so as to monitor the structure (206). The acoustic response to movement of traffic (205) on the network in the vicinity of the structure is detected and analysed to detect the acoustic response (303, 304) of the structure. The acoustic response of the structure is then analysed to detect any change in condition. The method thus uses the normal movement of traffic on the network, e.g. trains on a rail network, to acoustic excite the structure and detects the resultant response. The method is particularly useful for condition monitoring of tunnels on a rail network.
    Type: Application
    Filed: February 22, 2013
    Publication date: January 15, 2015
    Inventor: Alastair Godfrey
  • Publication number: 20150007661
    Abstract: An acoustic isolation chamber. The chamber comprises a housing defining a volume. A first region of the volume is configured to receive a photoacoustic sensor head. A second region of the volume is configured to receive the UUT. A sound proofing means encompassing at least a portion of the volume.
    Type: Application
    Filed: July 7, 2014
    Publication date: January 8, 2015
    Inventors: Kenneth Horan, Michael Cunningham, James Fryar, David Allen
  • Patent number: 8927125
    Abstract: A quencher for a flow cell battery is described. The quencher utilizes a quench solution formed from FeCl2 in a dilute HCl solution in order to quench chlorine emissions from the flow cell battery. A quench sensor is further described. The quench sensor monitors the concentration level of FeCl2 in the quench solution and may also monitor the level of the quench solution in the quencher.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: January 6, 2015
    Assignee: Imergy Power Systems, Inc.
    Inventors: Majid Keshavarz, Saroj Kumar Sahu, Ge Zu
  • Publication number: 20140352443
    Abstract: A method of measuring a wall thickness of a pipe can include optically detecting vibration of the pipe, and computing the wall thickness of the pipe, the computing being based at least partially on the optically detected vibration. Another method of measuring a wall thickness of a pipe can include optically detecting temperature of the pipe, and computing the wall thickness of the pipe, the computing being based at least partially on the optically detected temperature. Another method of measuring a wall thickness of a pipe can include optically detecting vibration and temperature of the pipe, and computing the wall thickness of the pipe, the computing being based at least partially on the optically detected vibration and temperature.
    Type: Application
    Filed: June 3, 2013
    Publication date: December 4, 2014
    Inventors: Laurence J. ABNEY, Paul NICHOLLS
  • Publication number: 20140352442
    Abstract: A vibration detection system comprises a light source, a biconical tapered fiber comprising a biconical fiber taper and a detector is disclosed. The emission light emitted by the light source is directed to the biconical tapered fiber in one side. A detector is coupled to the other end of the biconical tapered fiber to measure the intensity of the light passing through. When the biconical tapered fiber is exposed to an external vibration, the biconical fiber taper deforms and modulates the light intensity accordingly. The received signal is then fed to the microcomputer to determine the amplitude and frequency of the external vibration. A method of vibration detection is also disclosed.
    Type: Application
    Filed: June 3, 2013
    Publication date: December 4, 2014
    Inventors: Jianqing LI, Ben XU, Yuanyuan PAN
  • Patent number: 8899115
    Abstract: A method and system are provided for inspecting a surface of an object with an optical scanner and a laser vibrometer. The method includes the steps of: (a) mapping at least a portion of the object surface using the optical scanner; (b) projecting a beam of light from the laser vibrometer onto the object surface at a measurement point; (c) locating the measurement point relative to the object surface using the optical scanner; and (d) measuring a position of the object surface using the laser vibrometer to determine, for example, a deflection of the object surface.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: December 2, 2014
    Assignee: United Technologies Corporation
    Inventors: Jesse R. Boyer, Randall W. Joyner
  • Publication number: 20140345388
    Abstract: A distributed fiber optic acoustic sensing system comprises an elongate body having an outer surface, an optical fiber disposed on the outer surface at a first predetermined wrap angle, and light transmitting and receiving means optically connected to the fiber for. The elongate body may include at least one substantially flat face, and/or a layer of swellable elastomer surrounding the body, and/or an outer elastomeric tube surrounding the elastomer layer. There may be at least one sensor pad disposed in the outer layer, the sensor pad comprising a stiffener and at least one longitudinal fiber affixed thereto or embedded therein. There may be a body of protective material surrounding the tube, which may have an outer surface that includes at least one substantially flat face and at least one sensor pad disposed in the body.
    Type: Application
    Filed: December 13, 2012
    Publication date: November 27, 2014
    Inventors: Johannis Josephus Den Boer, Albena Alexandrova Mateeva, Jeremiah Glen Pearce, Jeffery Joseph Mestayer, William Birch, Jorge Louis Lopez, Kees Hornman
  • Publication number: 20140290372
    Abstract: A fiber optic acoustic sensor and a method of using same. The sensor includes a light emitting diode and a fiber optic probe having a transmitting multimode optical fiber and at least one receiving multimode optical fiber. The transmitting multimode optical fiber and the receiving multimode optical fiber are substantially parallel to a longitudinal axis of the probe. The fiber optic probe communicates with the light emitting diode. The sensor further includes a cantilever, which includes a cantilever rod. The cantilever rod includes a proximal end with an edge reflector located thereon. The edge reflector is spaced apart from the fiber probe and oriented to face said fiber probe. The edge reflector is able to move in a direction substantially perpendicular to the longitudinal axis of the fiber optic probe. The sensor further includes a light intensity detector communicating with the fiber optic probe.
    Type: Application
    Filed: December 9, 2013
    Publication date: October 2, 2014
    Inventors: Joseph A. Bucaro, Brian H. Houston, Nicholas Lagakos
  • Publication number: 20140260640
    Abstract: A method of scanning a sample includes simultaneously forming a plurality of co-linear scans. Each scan is formed by a sweep of a spot by an acousto-optical device (AOD). The co-linear scans are separated by a predetermined spacing. A first plurality of swaths are formed by repeating the simultaneous forming of the plurality of co-linear scans in a direction perpendicular to the co-linear scans. The first plurality of swaths have an inter-swath spacing that is the same as the predetermined spacing. A second plurality of swaths can be formed adjacent to the first plurality of swaths. Forming the second plurality of swaths can be performed in an opposite direction to that of the first plurality of swaths or in a same direction. An inspection system can implement this method by including a diffractive optical element (DOE) path after a magnification changer.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: KLA-Tencor Corporation Drive
    Inventor: KLA-Tencor Corporation
  • Patent number: 8820167
    Abstract: A sensor includes a housing adapted to be secured to a component within a system to be monitored by the sensor, an optical fiber, and a membrane spring assembly. The optical fiber includes a sensing portion containing a fiber Bragg grating that is able to undergo expansion and contraction resulting from movement of the optical fiber at a second location relative to a first location. The membrane spring assembly includes a membrane disc, wherein movement of a central portion thereof causes corresponding displacement of the optical fiber at the second location to cause expansion and contraction of the sensing portion of the optical fiber containing the fiber Bragg grating, which expansion and contraction effects a change in a light wavelength reflected by the fiber Bragg grating. The light wavelength reflected by the fiber Bragg grating can be used to measure movement of the central portion of the membrane disc.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: September 2, 2014
    Assignee: Siemens Energy, Inc.
    Inventors: Evangelos V. Diatzikis, Michael Twerdochlib, Luis Alberto de Almeida Ferreira, Francisco Manuel Moita Araújo
  • Patent number: 8813571
    Abstract: There is provided an optical microphone for detecting an acoustic wave propagating in an ambient fluid, the optical microphone including: a propagation medium section; a light source for emitting a light wave to be transmitted through a diffraction region in the propagation medium section; and a photoelectric conversion section for detecting the light wave having been transmitted through the propagation medium section. A first acoustic wave which is a portion of the acoustic wave and a second acoustic wave which is another portion thereof are allowed to propagate in the propagation medium section so as to simultaneously arrive at the diffraction region, and an interference component between a +1st order diffracted light wave and a ?1st order diffracted light wave of the light wave generated based on a refractive index distribution of the propagation medium occurring in the diffraction region.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: August 26, 2014
    Assignee: Panasonic Corporation
    Inventors: Takuya Iwamoto, Masahiko Hashimoto, Ushio Sangawa, Yuriko Kaneko
  • Publication number: 20140230558
    Abstract: A method of cleaning a surface includes the steps of directing a laser beam to the surface at a predetermined location and capturing for the predetermined location a) data relating to an acoustic response induced by interaction of the laser with the surface, b) data relating to the optical reflectivity of the surface at the predetermined location, and c) data relating to the spectrographic response of a plume generated by interaction of the laser with the surface.
    Type: Application
    Filed: February 10, 2014
    Publication date: August 21, 2014
    Inventors: Clive GRAFTON-REED, David WHITEHEAD, Simon CHEETHAM, Sundar MARIMUTHU
  • Patent number: 8800375
    Abstract: Methods and systems used to perform sweep-free stimulated Brillouin scattering-based fiber optical sensing are described. In one aspect, a method includes interrogating different parts of a Brillouin gain spectrum using multiple optical tones in an optical fiber. The interrogating includes sending at least two pump tones into the optical fiber from one end of the optical fiber, such that a frequency spacing between the pump tones is larger than a width of the Brillouin gain spectrum. The interrogating also includes sending at least two probe tones into the optical fiber from another end of the optical fiber, such that a frequency spacing between the probe tones is different from the frequency spacing between the pump tones. The method further includes generating a sensing output based on the interrogating.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: August 12, 2014
    Assignee: University of Southern California
    Inventors: Asher Voskoboinik, Alan E. Willner, Moshe Tur
  • Publication number: 20140208855
    Abstract: A method and system for distributed acoustic sensing using multimode optical fibers.
    Type: Application
    Filed: January 26, 2013
    Publication date: July 31, 2014
    Applicant: Halliburton Energy Services
    Inventor: Neal Gregory Skinner
  • Publication number: 20140196544
    Abstract: An object information acquiring apparatus disclosed by this specification includes a detector configured to detect a photoacoustic wave generated from an object on which light is irradiated from a light source, a generator configured to generate, using the photoacoustic wave, an image indicating characteristic information in a photographing region in the object, an acquirer configured to acquire information concerning quantitativity of a measurement value of the photoacoustic wave in the photographing region, and an extractor configured to extract a region having quantitativity in the image on the basis of the information concerning quantitativity.
    Type: Application
    Filed: January 9, 2014
    Publication date: July 17, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Koichiro Wanda
  • Publication number: 20140182384
    Abstract: An object information acquisition apparatus disclosed in the present specification includes a light source, an acoustic wave detection unit, and a processing unit. The light source is configured to emit light. The acoustic wave detection unit is configured to detect a photoacoustic wave generated by irradiation of an object with the light and to output a detection signal. The processing unit is configured to be able to acquire two or more types of object information on the basis of the detection signal and configured to cause a display unit to display at least one type of object information selected by a user from among the two or more types of object information.
    Type: Application
    Filed: December 23, 2013
    Publication date: July 3, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Tadaki WATANABE, Hiroshi ABE
  • Publication number: 20140182385
    Abstract: A photoacoustic probe and photoacoustic device implementing the photoacoustic probe may reduce an artifact caused by an ultrasonic wave generated in the photoacoustic probe without mounting a separate device. The photoacoustic probe and photoacoustic device implementing the photoacoustic probe may reduce an artifact by changing a configuration or a structure provided in the photoacoustic probe. The photoacoustic probe may receive a photoacoustic signal generated from an inner material of an object absorbing light of a predetermined wavelength and may include a piezoelectric module to convert the photoacoustic signal into an electric signal, and an object contact unit disposed on the front surface of the piezoelectric module, the object contact unit contacting the object and not absorbing the light of a predetermined wavelength.
    Type: Application
    Filed: December 27, 2013
    Publication date: July 3, 2014
    Applicants: SAMSUNG MEDISON CO., LTD., SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jung Taek Oh, Jung Ho Kim, Jong Kyu Jung