Produced By Radiant Energy Patents (Class 73/24.02)
  • Patent number: 10627339
    Abstract: Modular photoacoustic detection device comprising: a photoacoustic cell including at least two chambers connected by at least two capillaries and forming a Helmholtz type differential acoustic resonator; acoustic detectors coupled to the chambers; a light source capable of emitting a light beam having at least one wavelength capable of exciting a gas intended to be detected and which can be modulated to a resonance frequency of the photoacoustic cell; a first photonic circuit optically coupling the light source to an input face of a first of the chambers; wherein the first photonic circuit is arranged in a detachable manner in a first housing formed in the acoustic cell and emerging on the input face of the first chamber.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: April 21, 2020
    Assignee: Commissariat A L'Energie Atomique et aux Energies Alternatives
    Inventors: Justin Rouxel, Mickael Brun, Alain Gliere, Sergio Nicoletti
  • Patent number: 10551356
    Abstract: A method for measuring the concentration of a gas includes heating a first gas with a pulse of light, the pulse of light having a wavelength absorbed by the first gas, wherein the first gas exerts pressure on a flexible membrane. The method includes receiving a first signal indicating a first deflection of the membrane, wherein the first deflection is due to a change in pressure of the first gas and receiving a second signal indicating a second deflection of the membrane occurring after the first signal, wherein the second deflection is due to the change in pressure of the first gas. The method includes determining a difference between the first signal and the second signal and, based on the difference between the first signal and the second signal, determining a first concentration of the first gas.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: February 4, 2020
    Assignee: Infineon Technologies AG
    Inventors: David Tumpold, Christoph Glacer
  • Patent number: 10451589
    Abstract: An acoustic wave detector may include: an exterior housing with an exterior housing wall, a gas chamber located within the exterior housing and configured to receive a gas therein. The exterior housing wall may include an aperture providing a gas passage between the gas chamber and the exterior of the acoustic wave detector. The acoustic wave detector may further include an excitation element configured to selectively excite gas molecules of a specific type in the gas received in the gas chamber in a time-varying fashion, thereby generating acoustic waves in the gas, and an acoustic wave sensor configured to detect the acoustic waves generated in the gas and acoustic waves generated outside of the acoustic wave detector. The acoustic wave sensor may have an acoustic port overlapping with the aperture in the exterior housing wall.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: October 22, 2019
    Assignee: Infineon Technologies AG
    Inventors: David Tumpold, Alfons Dehe, Christoph Glacer
  • Patent number: 10345225
    Abstract: An analyzer includes a quantum cascade laser that converts a cyclic driving signal to laser light; an optical receiver that receives the laser light having passed through a sample and outputs a detected signal depending on intensity of the laser light; and a data calculation portion that outputs information representing absorption characteristics of the sample. The data calculation portion includes a delaying unit that produces a time-delayed waveform by applying a time delay to a reference driving signal; an adding unit that produces a symmetrical waveform by adding the time-delayed waveform and the detected signal; a time inversion unit that produces a time-inverted waveform by time-inverting the symmetrical waveform; and a subtracting unit that produces a waveform difference between the time-inverted waveform and the symmetrical waveform. The data calculation portion repeatedly calculates the waveform difference by changing the time delay until the waveform difference is minimized.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: July 9, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Takashi Fukuoka
  • Patent number: 10302554
    Abstract: An acoustic wave detector may include: an exterior housing with an exterior housing wall, a gas chamber located within the exterior housing and configured to receive a gas therein. The exterior housing wall may include an aperture providing a gas passage between the gas chamber and the exterior of the acoustic wave detector. The acoustic wave detector may further include an excitation element configured to selectively excite gas molecules of a specific type in the gas received in the gas chamber in a time-varying fashion, thereby generating acoustic waves in the gas, and an acoustic wave sensor configured to detect the acoustic waves generated in the gas and acoustic waves generated outside of the acoustic wave detector. The acoustic wave sensor may have an acoustic port overlapping with the aperture in the exterior housing wall.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: May 28, 2019
    Assignee: Ingineon Technologies AG
    Inventors: David Tumpold, Alfons Dehe, Christoph Glacer
  • Patent number: 10288553
    Abstract: Modular photoacoustic detection device comprising: a photoacoustic cell including at least two chambers connected by at least two capillaries and forming a Helmholtz type differential acoustic resonator; acoustic detectors coupled to the chambers; a light source capable of emitting a light beam having at least one wavelength capable of exciting a gas intended to be detected and which can be modulated to a resonance frequency of the photoacoustic cell; a first photonic circuit optically coupling the light source to an input face of a first of the chambers; wherein the first photonic circuit is arranged in a detachable manner in a first housing formed in the acoustic cell and emerging on the input face of the first chamber.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: May 14, 2019
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventors: Justin Rouxel, Mickael Brun, Alain Gliere, Sergio Nicoletti
  • Patent number: 9995717
    Abstract: This invention employs an object information acquiring apparatus including a probe for receiving, as a received signal, an acoustic wave which is generated within an object irradiated with light and propagates on an object surface, and a processor for generating object information, which is information based on an internal optical characteristic value of the object, by using intensity of the received signal. The processor corrects the intensity of the received signal by using the reflectance upon the acoustic wave entering the probe which is calculated based on the angle of the acoustic wave entering the probe, and on the acoustic impedance and acoustic velocity of the object and the probe.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: June 12, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroshi Yamamoto, Yukio Furukawa, Toshinobu Tokita
  • Patent number: 9482690
    Abstract: A scanning probe microscope to measure a sample set on a sample mount in liquid includes a scanning mechanism to scan a cantilever provided with a probe at a free end along an X-axis, a Y-axis, and a Z-axis perpendicular to each other, and a liquid contact member including an optical transmission portion to transmit detection light for detecting a displacement of the cantilever, and arranged at least partially in contact with the liquid. The liquid contact member is not scanned by the scanning mechanism.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: November 1, 2016
    Assignee: OLYMPUS CORPORATION
    Inventors: Nobuaki Sakai, Yoshitsugu Uekusa
  • Patent number: 9360417
    Abstract: A gas measurement device for measuring the concentration of a plurality of gas components by means of absorption measurement comprising a light source for infrared radiation (3) or a thermal radiator (4) as a light source (5), an optics (22) for bundling the light of the light source (5), a band pass filter (4) and a photoacoustic measurement cell (12) for measuring a plurality of gas concentrations, wherein a Fabry-Perot filter (6) is provided in front of the photoacoustic measurement cell (12) in addition to the band pass filter (4) for selecting the absorption spectra.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: June 7, 2016
    Assignee: SICK AG
    Inventor: Rolf Disch
  • Patent number: 9285310
    Abstract: A system for collecting gas samples emitted from skin and detecting concentrations of specified components therein. The system includes a collection chamber housing defining an interior space, the collection chamber housing having a gas inlet, a gas outlet, and an opening. The opening is configured for enclosing a skin portion from which to receive an emitted gas sample and sealing the interior space against the skin portion. An inert gas source is connected to the gas inlet, which is capable of allowing inert gas from the inert gas source to flow into the interior space. A gas cell is connected to the gas outlet, which is capable of allowing the inert gas and the gas sample to flow from the interior space into the gas cell. As a laser travels through the gas cell, power and optoacoustic signals are measured and used to determine a concentration of the specified component.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: March 15, 2016
    Assignee: Pranalytica, Inc.
    Inventors: C. Kumar Patel, L. Ravi Narasimhan
  • Patent number: 9194848
    Abstract: A detector for detecting constituents of a liquid for use in liquid chromatography is disclosed. The detector includes a first optical flow cell body and a second optical flow cell body, each having a channel therethrough that allows passage of a liquid from an inlet port to an outlet port. The first and second optical flow cell bodies are arranged in series such that the liquid exiting the outlet port of the first optical flow cell body enters the inlet port of the second optical flow cell body. An insulator resides between the first optical flow cell body and the second optical flow cell body, which is adapted to electrically insulate the first optical flow cell body from the second optical flow cell body while allowing the liquid to pass from the first optical flow cell body to the second optical flow cell body.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: November 24, 2015
    Assignee: Practichem, LLC
    Inventor: Nicholas DeMarco
  • Patent number: 9140644
    Abstract: This invention relates to a method that makes the measurement of a trace gas concentration invariant or at least less affected to pressure variations in the gas and atmospheric pressure changes. This method neither requires a pressure sensor nor a pressure calibration routine. Furthermore, the method can be applied to other gas species present in the background gas or to the background gas itself that cross-interfere with the target gas of interest. This allows removing any pressure dependency of cross-interference parameters of other gas species and/or the background gas. The new method for accurately measuring a gas concentration is based on optimizing the wavelength modulation amplitude of the laser to minimum pressure dependency.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: September 22, 2015
    Assignee: Axetris AG
    Inventors: Andreas Wittmann, Stefan Manzeneder, Rui Protasio, Michel Studer, Thomas Hessler
  • Patent number: 9057778
    Abstract: A method and system for detecting composition of a physical space comprising: a laser beam source; an acoustic sensor; a beam focusing mechanism for focusing the laser beam at predetermined points in the physical space to generate a thermal inhomogeneity which results in the propagation of a pressure wave that propagates outward from the predetermined excitation point at a propagation velocity approximating the speed of sound for the particular composition of the media; at least one processor for controlling the timing for the laser beam focusing to generate thermal inhomogeneities; whereby the laser focal point is moved sequentially along the light-of-sight at various excitation points by the beam focusing mechanism approximately at the phase front velocity to define a series of predetermined excitation points and pressure wave propagations such that the series of pressure wave propagations combine to produce a coherent pressure wave detectable by the acoustic sensor.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: June 16, 2015
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Kristan Peter Gurton, Yongle Pan
  • Publication number: 20150101395
    Abstract: A photoacoustic gas sensor device for analyzing gas includes an emitter module and a pressure-sensitive module. The emitter module is arranged on a carrier substrate and emits light pulses. The pressure-sensitive module is arranged on the carrier substrate within a reference gas volume. The reference gas volume is separated from a volume intended to be filled with a gas to be analyzed. Further, the pressure-sensitive module generates a sensor signal indicating information on an acoustic wave caused by light pulses emitted by the emitter module interacting with a reference gas within the reference gas volume. Additionally, the emitter module is arranged so that light pulses emitted by the emitter module reach the reference gas volume after crossing the volume intended to be filled with the gas to be analyzed.
    Type: Application
    Filed: October 14, 2013
    Publication date: April 16, 2015
    Applicant: INFINEON TECHNOLOGIES AG
    Inventors: Alfons Dehe, Stefan Kolb, Horst Theuss
  • 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: 20140373599
    Abstract: A device for generating a frequency reference including a frequency reference generation unit coupled to an integration cell to generate a frequency reference signal based on radio frequency (RF) produced pressure waves detected by an acoustic detector in the integration cell.
    Type: Application
    Filed: June 25, 2013
    Publication date: December 25, 2014
    Inventors: Django TROMBLEY, Phillip Michel NADEAU
  • Patent number: 8857242
    Abstract: The invention relates to a gas sensor having a mechanical microresonator, which has an excitation apparatus for optically exciting a mechanical oscillation of the microresonator as well as a reading apparatus for detecting the oscillation of the microresonator, wherein the reading apparatus comprises a waveguide which is implemented together with the microresonator on a dielectric or semiconducting substrate and is intended to optically read the oscillation of the microresonator, and wherein the excitation apparatus has an optical waveguide which is implemented on the same substrate and optically connects an excitation light source to the immediate surroundings of the microresonator. The invention also relates to a use of such a sensor to analyse a gas composition.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: October 14, 2014
    Assignees: Miopas GmbH, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Helmut Heidrich, Peter Lutzow, Wolfgang Schlaak, Herbert Venghaus, Thomas Wegner
  • Patent number: 8850867
    Abstract: A photoacoustic sensor, containing a resonance body, which at least partially delimits a space for receiving molecules to be detected, and a device for detecting an oscillation of the resonance body, including a device for optically detecting the location of at least one partial surface of the resonance body. A method for the photoacoustic detection of molecules in the gas phase and to a method for producing an optically integrated photoacoustic sensor.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: October 7, 2014
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Wolfgang Schade, Michael Köhring, Tobias Schossig
  • Publication number: 20140245816
    Abstract: A gas measurement device for measuring the concentration of a plurality of gas components by means of absorption measurement comprising a light source for infrared radiation (3) or a thermal radiator (4) as a light source (5), an optics (22) for bundling the light of the light source (5), a band pass filter (4) and a photoacoustic measurement cell (12) for measuring a plurality of gas concentrations, wherein a Fabry-Perot filter (6) is provided in front of the photoacoustic measurement cell (12) in addition to the band pass filter (4) for selecting the absorption spectra
    Type: Application
    Filed: February 12, 2014
    Publication date: September 4, 2014
    Applicant: SICK AG
    Inventor: Rolf DISCH
  • Patent number: 8820141
    Abstract: Device for detecting a gas having an excitation device for exciting the gas by an electromagnetic wave having a wavelength corresponding approximately to that of the gas; and a detection device for detecting the excitation of the gas, the detection device having a waveguide connected to the excitation device, a part of which forms a movable element designed to be in contact with the gas and capable of being set into vibration by the impact of the excited gas molecules; and a measurement sensor, for measuring the vibration of the element, the measurement sensor and the element forming the detection device.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: September 2, 2014
    Assignee: Commissariat a l'energie Atomique et aux Energies Alternatives
    Inventors: Serge Gidon, Patrick Chaton, Sergio Nicoletti
  • Patent number: 8806916
    Abstract: A single gas detector combines a dual cavity photo-acoustic gas sensor with a common microphone and common source. Electrical outputs from the microphone can be analyzed to determine an analyte gas concentration in the local region being monitored. Radiant energy from the common source can be directed into both cavities simultaneously. Alternately, the sensor can be used with two microphones to establish a concentration of each of two different gasses, or a gas and water vapor.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: August 19, 2014
    Assignee: Honeywell International Inc.
    Inventor: Steven P. Gautieri
  • Patent number: 8806915
    Abstract: An apparatus for measuring concentrations of airborne particulate matter may include, in one embodiment, a primary channel to receive air samples from the external environment. The air samples include particles of varying sizes. A microfluidic circuit communicates with the primary channel and small particles (having a size less than a threshold size) are diverted around a bend into a secondary channel. Remaining larger particles are unable to make the bend and continue through the primary channel. A mass-sensitive element communicating with the secondary channel includes a collection surface to collect the small particles. A resonant frequency of the mass-sensitive element is reduced in proportion to the mass of the particles collected.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: August 19, 2014
    Assignee: University of California
    Inventors: Richard M. White, Igor Paprotny, Frederick Doering
  • Patent number: 8746038
    Abstract: A photoacoustic detector includes a sensing region for receiving atmospheric samples. One microphone receives acoustic samples from the sensing region. Another microphone receives acoustic samples from a displaced region. Microphone outputs can be subtracted to eliminate common noise and to generate an indicium of gas present in the sensing region.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: June 10, 2014
    Assignee: Honeywell International Inc.
    Inventor: Tom M. Rezachek
  • Publication number: 20140150529
    Abstract: A method and system for detecting composition of a physical space comprising: a laser beam source; an acoustic sensor; a beam focusing mechanism for focusing the laser beam at predetermined points in the physical space to generate a thermal inhomogeneity which results in the propagation of a pressure wave that propagates outward from the predetermined excitation point at a propagation velocity approximating the speed of sound for the particular composition of the media; at least one processor for controlling the timing for the laser beam focusing to generate thermal inhomogeneities; whereby the laser focal point is moved sequentially along the light-of-sight at various excitation points by the beam focusing mechanism approximately at the phase front velocity to define a series of predetermined excitation points and pressure wave propagations such that the series of pressure wave propagations combine to produce a coherent pressure wave detectable by the acoustic sensor.
    Type: Application
    Filed: December 4, 2012
    Publication date: June 5, 2014
    Applicant: U.S. ARMY RESEARCH LABORATORY ATTN: RDRL-LOC-I
    Inventors: KRISTAN PETER GURTON, YONGLE PAN
  • Publication number: 20140123729
    Abstract: Cavity enhanced absorption spectroscopy systems and methods for detecting trace gases using a resonance optical cavity, which contains a gas mixture to be analyzed, and a laser coupled to the cavity by optical feedback. The cavity has any of a variety of configurations with two or more mirrors, including for example a linear cavity, a v-shaped cavity and a ring optical cavity. The cavity will have multiple cavity resonant modes, or a comb of frequencies spaced apart, as determined by the parameters of the cavity, including the length of the cavity, as is well known. Systems and methods herein also allow for optimization of the cavity modes excited during a scan and/or the repetition rate.
    Type: Application
    Filed: November 2, 2012
    Publication date: May 8, 2014
    Applicant: LI-COR, INC.
    Inventors: Alexander Kachanov, Serguei Koulikov
  • Patent number: 8701465
    Abstract: A photoacoustic detector includes a sensing region for receiving atmospheric samples of a gas. A permeable membrane overlays a gas input port of the sensing region. The membrane is mechanically clamped to the sensing region by a compression force.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: April 22, 2014
    Assignee: Honeywell International Inc.
    Inventors: Gary P. Shubinsky, Thomas M. Rezachek, Michael J. Koch, Takashi Yamaguchi
  • Patent number: 8695402
    Abstract: A photoacoustic gas detector includes an integrated source, infrared filter and an acoustic sensor. The source, filter and acoustic sensor can be integrated onto one or more semiconductor substrates, such as silicon. Processing circuitry can also be integrated onto the substrate. Further, the source, filter and acoustic sensor can be integrated into a single component package, such as a metal can transistor package.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: April 15, 2014
    Assignee: Honeywell International Inc.
    Inventor: Walter Thorson
  • Patent number: 8689607
    Abstract: A photoacoustic detector includes first and second microphones carried by an acoustic sensing chamber. Signals from the microphones are processed using lock-in detection to increase the signal-to-noise ratio. An acoustic pressure generator can be incorporated to calibrate the microphones.
    Type: Grant
    Filed: May 4, 2011
    Date of Patent: April 8, 2014
    Assignee: Honeywell International Inc.
    Inventors: Thomas M. Rezachek, Gary P. Shubinsky, Michael Freeman
  • Patent number: 8661874
    Abstract: A photoacoustic detector includes a sensing region for receiving atmospheric samples. Radiant energy from a source is directed toward the sensing region. A thermal isolator and a displaced optical filter are positioned between the incoming radiant energy and the sensing region so that the radiant energy passes, at least in part, through both elements.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: March 4, 2014
    Assignee: Honeywell International Inc.
    Inventor: Thomas M. Rezachek
  • Patent number: 8659759
    Abstract: Cavity enhanced absorption spectroscopy systems and methods for detecting trace gases. When the frequency of laser light approaches the frequency of a resonance cavity mode, the laser begins to fill the cavity to that mode. Optical intensity inside the cavity reflects total cavity loss when the laser light frequency coincides with the cavity mode transmission peak. The intra-cavity optical power also depends on the coupling efficiency of the laser beam to the particular cavity mode. Measurement of intensities of three optical signals, namely, intensity of the light incident on to the cavity, intensity of the light reflected from the cavity, and intensity of the intra-cavity optical power, with their appropriate normalization advantageously significantly reduce effects of baseline calibration and drift as the normalized signal only depends on total cavity loss, and not the coupling efficiency, as in traditional approaches.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: February 25, 2014
    Assignee: Li-Cor, Inc.
    Inventors: Serguei Koulikov, Alexander Kachanov
  • Publication number: 20140047901
    Abstract: A non-destructive resonance (NDR) method of measuring and controlling an O2 fraction, a CO fraction, or a CO2 fraction in a gas process stream. The method includes: determining the resonance frequency of an off-line standard gas composition; scanning a predetermined characteristic parameter around the predetermined resonance frequency; plotting a first 3D chart to obtain a 3D vector; flowing gas through the NDR system; on-line scanning a corresponding on-line measured parameter around the resonance frequency, and recording the same; plotting a second 3D chart to obtain a 3D vector which precisely identifies the value of the second measured parameter; comparing a 3D standard first vector to the 3D measured second vector; and correlating between a relative characteristic parameter change and the change in the gas fraction.
    Type: Application
    Filed: July 11, 2013
    Publication date: February 20, 2014
    Inventor: Uri RAPOPORT
  • Publication number: 20140026639
    Abstract: A system for analyzing gas concentrations in a gas mixture includes an array of semiconductor light sources which are configured to generate an electromagnetic radiation having a narrow bandwidth. A controller modulates the electromagnetic radiation at a modulating frequency to provide light pulses at an absorption wavelength of at least one target gas. The system also includes an acoustic resonant gas chamber to hold the gas mixture and configured to receive the light pulses and amplify acoustic signals emanating from the gas mixture. A processor determines a concentration of the target gas based on acoustic signals.
    Type: Application
    Filed: July 30, 2012
    Publication date: January 30, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Xuefeng Wang, Boon Kwee Lee
  • Patent number: 8593636
    Abstract: The invention relates to a pipe system comprising a) a pipe, b) a fluid sensing station and c) a remote light detector system. The pipe comprises a flow channel and an annular fluid cavity surrounding the flow channel. The fluid sensing station comprises a sensing fluid cavity which is in fluid communication with the annular fluid cavity, and the sensing fluid cavity comprises a light emitter and a light receiver placed at a distance from each other. The light emitter and the light receiver are optically connected to each other and optically connected to the remote light detector system. The invention also relates to a fluid sensing system for sensing a fluid in an annulus cavity of a pipe, said fluid sensing system comprises a fluid sensing station and a remote light detector system. The fluid sensing station comprises a sensing fluid cavity comprising a light emitter and a light receiver placed at a distance from each other and optically connected to each other.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: November 26, 2013
    Assignee: National Oilwell Varco Denmark I/S
    Inventors: Mikael Kristiansen, Nicky Weppenaar
  • Patent number: 8590365
    Abstract: The invention relates to a pipe system comprising a pipe, a gas sensing station and a remote output system. The pipe comprises a pipe gas cavity, such as an annulus, extending lengthwise in part or all of the length of the pipe; the gas sensing station comprises a sensing gas cavity which is in gas communication with the pipe gas cavity: The sensing gas cavity comprises a photoacoustic spectroscope. The pipe system comprises at least one optical feeding fiber for feeding light to the photoacoustic spectroscope and a transmission path for transferring a signal from the photoacoustic spectroscope to the remote output system, the transmission path from the gas sensing station to the remote output system is an optical transmission path. The pipe may for example be a flexible pipe e.g. an umbilical or a pipe for the transportation of crude oil from a well to an off shore or on shore station, for example a ship or a platform. The gas sensing station may be integrated in the pipe, e.g.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: November 26, 2013
    Assignee: National Oilwell Varco Denmark I/S
    Inventors: Nicky Weppenaar, Mikael Kristiansen
  • Patent number: 8584508
    Abstract: Some embodiments relate to a photoacoustic sensor that includes a gas cell having an opening and a detector to collect pressure fluctuations within the gas cell to determine a spectral content of the pressure fluctuations within the ambient environment. The photoacoustic sensor further includes a light source to generate radiation to radiate sample gas within the gas cell and a control that receives signals from the detector that represent the spectral content of the pressure fluctuations within the ambient environment. The control adjusts a frequency of the radiation produced by the light source to a frequency that conflicts less with the spectral content of the pressure fluctuations within the ambient environment. The detector generates output electrical signals in response to acoustic signals generated by pressure fluctuations of the radiated sample gas.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: November 19, 2013
    Assignee: Honeywell International Inc.
    Inventor: Thomas M. Rezachek
  • Patent number: 8561454
    Abstract: A photoacoustic gas sensor, system and method is generally described. In some examples, a photoacoustic gas sensor includes a MEMS-based wavelength-selective optical modulator and a ring array of acoustic sensors. The MEMS-based optical modulator can be adapted to provide flexible wavelength selectivity such that a large number of chemical compounds may be detected. The ring array of acoustic sensors can be adapted to measure photoacoustically generated acoustic signals without the need for resonant enhancement of a photoacoustic cell of the gas sensor. In some examples, a unique uncorrelated and deterministic signal may be used to modulate each light wavelength of interest. Signal processing may be used that allows the simultaneous measurement of the absorption spectra of multiple optical wavelengths as well as the rejection of unwanted acoustic noise.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: October 22, 2013
    Assignee: Empire Technology Development LLC
    Inventor: Ralph Muehleisen
  • Patent number: 8548755
    Abstract: Switching a transmitting and receiving direction of two transducers (2,3) in the forward and the reverse direction, a time differential memory part (17b) storing a propagation time differential every K times a unit measurement process being executed, the propagation time differential being a differential between a propagation time of the ultrasonic wave signal in a forward direction and in a reverse direction, a flow rate calculating part (15) calculating a flow rate of a passing fluid based on a lump sum of propagation times in both the forward and the reverse directions obtained at least every K times of a unit measurement process being executed, an estimating part (18) estimating a change in a momentary flow rate of the fluid based on the time differential obtained every K times of the unit measurement process being executed and storing thereof in a time differential memory part (17b), thus obtaining an accurate flow rate and detecting the change in the momentary flow rate.
    Type: Grant
    Filed: December 25, 2009
    Date of Patent: October 1, 2013
    Assignee: Panasonic Corporation
    Inventors: Koichi Takemura, Fumikazu Shiba, Daisuke Bessho
  • Patent number: 8539816
    Abstract: A system for locking a laser with a resonant optical cavity includes a laser that emits a laser beam, a resonant optical cavity having at least two cavity mirrors, one of which is a cavity coupling mirror, mode matching optics configured to couple the laser beam to the cavity via the cavity coupling mirror, means for applying a periodic dither or modulation waveform signal to the optical frequency of the incident laser beam or to the laser itself to thereby induce modulation of the intracavity optical power, and means for enabling a portion of the light emerging from the cavity coupling mirror to enter a cavity of the laser while maintaining an optical phase that results in periodic optical feedback locking whereby a mean optical frequency of the laser matches a resonance peak of the cavity.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: September 24, 2013
    Assignee: LI-COR, Inc.
    Inventors: Alexander Kachanov, Serguei Koulikov
  • Publication number: 20130239658
    Abstract: A photoacoustic sensing device includes a laser tuned to emit light to cause optical absorption by a gas to be detected, a resonant acoustic sensor positioned to receive pressure waves from the gas, wherein the laser is modulated to match a resonant frequency of the resonant acoustic sensor, and a first mirror positioned to receive light from the laser after the light has passed through the gas and to reflect the received light back through the gas to cause additional optical absorption.
    Type: Application
    Filed: March 14, 2012
    Publication date: September 19, 2013
    Applicant: Honeywell International Inc.
    Inventor: Lisa Lust
  • Publication number: 20130205871
    Abstract: The photoacoustic device for measuring the quantity of at least one gas. The Helmholtz-type esonant container comprises at least two tubes closed at their ends and linked together, close to each of their respective ends, by capillary tubes of diameter lower than the diameter of the parallel tubes. Each of the two radiant laser energy sources is physically separated and adapted to supply an excitation energy to the gas in the container at a different emission wavelength. The modulation means modulates the excitation energy supplied by each laser energy source with a modulation frequency corresponding to the acoustic resonance frequency of the container. At least one acoustoelectric transducer disposed on one of the tubes detects the produced acoustic signals produced and supplies an electric signal representative of the gas concentration in the container.
    Type: Application
    Filed: July 21, 2011
    Publication date: August 15, 2013
    Applicants: AEROVIA, UNIVERSITE DE REIMS CHAMPAGNE ARDENNE
    Inventors: Virginie Zeninari, Bertrand Parvitte, Lilian Joly, Georges Durry, Ronan Le Loarer, Jean Charles Garcia, Regis Hamelin
  • Patent number: 8485025
    Abstract: The present invention provides a standing wave fiber assembly for the collection and detection of a biological target in a complex biological fluid, including: an oscillator; and an elongated fiber coupled to the oscillator, wherein the elongated fiber is selectively exposed to a fluid potentially containing the biological target, and wherein the resonated elongated fiber attracts the biological target, and wherein a change in a response of the resonated elongated fiber indicates the presence of the biological target. The assembly also includes a top cover plate including one or more electrical connections and a port through which the fluid is introduced. The assembly further includes a bottom cover plate including a well in which the fluid is contained. Optionally, the elongated fiber includes one or more probes homogenously functionalized along its length that bind targeted biological materials.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: July 16, 2013
    Assignee: InSituTec, LLC
    Inventors: Shane Woody, Jennifer Weller
  • Patent number: 8479559
    Abstract: A photoacoustic detection device includes a cylindrical acoustic resonator having an arrangement for guiding light essentially perpendicular to a cylinder axis in such a manner that a second azimuthal resonance of cylinder oscillation is excitable by absorption of the light.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: July 9, 2013
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Andras Miklos, Judit Angster
  • Patent number: 8482298
    Abstract: An automotive urea solution monitoring device is deployed in conjunction with the urea tank of a selective catalytic reduction vehicle. An RF signal of a constant frequency may be generated across a resonant circuit, which may be comprised of an inductor and a PCB trace capacitor, or the like. Electromagnetic radiation is propagated into the automotive urea solution in the urea tank. The conductivity and dielectric properties of the liquid change the impedance of the discrete/trace capacitor and or the discrete/trace inductor. These changes are proportional to ammonia content, temperature, and/or level of the automotive urea solution in the urea tank and are preferably detected by a microcontroller, or the like, and then transmitted to a selective catalytic reduction vehicle engine management system, or the like.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: July 9, 2013
    Assignee: Schrader Electronics Ltd.
    Inventors: Idir Boudaoud, Alan Kenneth McCall, Adrian M. Page
  • Patent number: 8441644
    Abstract: A method and apparatus for the photo-acoustic identification and quantification of one or more analyte species present in a gaseous or liquid medium in low concentration utilizing a laser and a resonant optical cavity containing the medium and having within the cavity at least two partially transparent mirrors, one of which is a cavity coupling mirror and one of which is moveably mounted on an assembly responsive to an input signal.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: May 14, 2013
    Assignee: LI-COR, Inc.
    Inventors: Alexander Kachanov, Serguei Koulikov
  • Publication number: 20130111975
    Abstract: A single gas detector combines a dual cavity photo-acoustic gas sensor with a common microphone and common source. Electrical outputs from the microphone can be analyzed to determine an analyte gas concentration in the local region being monitored. Radiant energy from the common source can be directed into both cavities simultaneously. Alternately, the sensor can be used with two microphones to establish a concentration of each of two different gasses, or a gas and water vapor.
    Type: Application
    Filed: November 9, 2011
    Publication date: May 9, 2013
    Applicant: Honeywell International Inc.
    Inventor: Steven P. Gautieri
  • Patent number: 8434366
    Abstract: Traditional photoacoustic sensors generally operate in a passive mode, which can degrade the performance. Here, however, a photoacoustic sensor has been disclosed that operates an acoustic resonance chamber and a transducer in an active mode so as to avoid the problems associated with traditional photoacoustic sensors; in particular, because the acoustic resonance chamber operates at near atmospheric pressure such as 100's Torr as opposed to 1 m Torr type of pressure for radio spectroscopy, the sensor is allowed to be scaled to operate on an integrated circuit or IC.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: May 7, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Chih-Ming Hung, Django Trombley
  • Publication number: 20130036793
    Abstract: An apparatus for measuring concentrations of airborne particulate matter may include, in one embodiment, a primary channel to receive air samples from the external environment. The air samples include particles of varying sizes. A microfluidic circuit communicates with the primary channel and small particles (having a size less than a threshold size) are diverted around a bend into a secondary channel. Remaining larger particles are unable to make the bend and continue through the primary channel. A mass-sensitive element communicating with the secondary channel includes a collection surface to collect the small particles. A resonant frequency of the mass-sensitive element is reduced in proportion to the mass of the particles collected.
    Type: Application
    Filed: August 8, 2011
    Publication date: February 14, 2013
    Applicant: University of California
    Inventors: Richard M. White, Igor Paprotny, Frederick Doering
  • Patent number: 8359904
    Abstract: A photoacoustic detection device including a nanophotonic circuit including a plurality of semiconductor lasers capable of emitting a different frequencies; input couplers connected to optical waveguides; a multiplexer; an output optical waveguide, emerging into a recess; a tuning fork having its free arms arranged at the output of the output optical waveguide; and means for detecting the vibration of the tuning fork, all these elements being assembled in a monolithic component.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: January 29, 2013
    Assignees: Commissariat a l'Energie Atomique et aux Energies Albernatives, Thales
    Inventors: Sergio Nicoletti, Philippe Andreucci, Mickaël Brun, Serge Gidon, Xavier Marcadet, Mathieu Carras
  • Patent number: 8359903
    Abstract: A photoacoustic detector for providing a measurement, includes a first light source and a second light source each configured to provide light of a same intensity while retaining a same spectral distribution. Additionally, the photoacoustic detector includes a first beam path allocated to the first light source and at least one second beam path allocated to the second light source, wherein a different absorption of light occurs in the first path and the second beam path in at least one selected wavelength range. Further, the photoacoustic detector includes a photoacoustic measuring cell; and a mechanism for alternately guiding light from the first beam path and from the second beam path into the photoacoustic measuring cell.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: January 29, 2013
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Andras Miklos, Judit Angster
  • Publication number: 20130008229
    Abstract: A device includes a resonator having an oscillating portion with dimensions chosen to lead to a desired resonant frequency. A light source is positioned to provide light along the length of the oscillating portion at a specific wave length. A detector detects a change in oscillation of the resonator responsive to the wave pressure produced by the light source heating a gas. The light source is modulated with a frequency the same as the resonant frequency of the resonator.
    Type: Application
    Filed: June 15, 2012
    Publication date: January 10, 2013
    Applicant: Honeywell International Inc.
    Inventors: Viorel Avramescu, Mihai Gologanu, Daniel Youngner, Bob Jon Carlson