Solid Content Of Gas Patents (Class 73/24.03)
  • Patent number: 10527482
    Abstract: A device for measuring superfine particles masses includes an exposure system with at least two measurement chambers having an identical geometry. Each measurement chamber has a deposition surface for the superfine particles which each have an aerosol feed line. The aerosol feed line has an outlet region to feed an aerosol onto the deposition surface, a means for generating a potential difference between the superfine particles in the aerosol and the deposition surface, and a grid arranged above the deposition surface. The outlet region has a widened outlet cross section having a constant distance from the deposition surface. At least one deposition surface is arranged on a piezoelectric crystal as a superfine balance. A first potential corresponding to a ground potential is present at each deposition surface. A second potential having a potential difference of at least 200 V in relation to the first potential is present at each grid.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: January 7, 2020
    Assignee: KARLSRUHER INSTITUT FUER TECHNOLOGIE
    Inventors: Hanns-Rudolf Paur, Sonja Muelhopt, Christoph Schlager
  • Patent number: 10101257
    Abstract: A particulate detection apparatus (3) controls a particulate sensor (2) for detecting the amount of particulates contained in exhaust gas and which has a pump (203) for supplying air to a detection section of the particulate sensor (2) into which the exhaust gas is introduced. The particulate detection apparatus (3) detects the flow rate of air supplied from the pump (203) to the particulate sensor (2) by a flow rate sensor (207). The particulate detection apparatus (3) maintains a consistent detection accuracy of the particulate sensor (2) based on the result of the detection by the flow rate sensor (207).
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: October 16, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Katsunori Yazawa, Kaoru Hisada
  • Patent number: 9949670
    Abstract: Provided is a measuring apparatus that may measure a vibration amount weighted by cartilage conduction characteristics of the human ear and thus allows for accurate evaluation of an electronic device having a vibrator. A measuring apparatus for evaluating an electronic device that delivers a sound through vibration transmission from a vibrator retained in a housing held against the human ear includes an ear simulator simulating the human ear and a vibration detector disposed on an artificial eardrum formed in the ear simulator.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: April 24, 2018
    Assignee: KYOCERA Corportion
    Inventor: Tomoyoshi Ikeda
  • Patent number: 9919582
    Abstract: A computing device determines that a first time for a first sound generated by a vehicle to reach a first sound maximum amplitude and a second time for a second sound generated by the vehicle to reach a second sound maximum amplitude are within a range. An object that reflects the second sound is identified based on an interval between receipt of the first and second sounds. A speed of sound is determined based at least in part on the time interval and a distance to the object. A humidity is determined based at least in part on the speed of sound. A vehicle subsystem is adjusted based on the humidity.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: March 20, 2018
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Alfred Green, David Karl Bidner
  • Publication number: 20150107335
    Abstract: A process is disclosed for using multiple acoustic resonators to sample fluids (gas or liquids), capture particulate (or aerosols) entrained in the fluid, and deliver a concentrated sample of particulate. The acoustic concentrator demonstrates many improvements over prior art that includes improved concentration of particulate below 3 micron, adjustability of the level of concentration, ability to function over a wide range of humidity and temperature, and reduced overall power consumption. For example, when installed on the inlet of an aerosol detection system, the acoustic concentrator has been shown to increase sensitivity that may lead to earlier detection of bioaerosol agents.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 23, 2015
    Inventors: G. Douglas Meegan, Brian Zadler, Jason R. Gallia, Paul Waters
  • Publication number: 20150059443
    Abstract: A measuring device for measuring dust in flue gas of small-scale furnace installations for solid fuels includes: a measuring probe; a weighing device having a filter device; a heated suction hose connecting the measuring probe to the weighing device; and a weighing module in which the weighing device is arranged. The weighing device is thermally insulated in the weighing module.
    Type: Application
    Filed: March 25, 2013
    Publication date: March 5, 2015
    Inventor: Stephan Ester
  • Publication number: 20140305191
    Abstract: The present invention relates to methods and devices for determining the weight of small particles, typically being nano-sized particles by use of resonating fibers in the form of elongate members being driven into resonance by an actuator or e.g. thermal noise/fluctuation. The frequency shift in resonance frequency due to depositing of nano-sized particles is correlated with the mass deposited on the elongate member and the vibration frequency of the elongate member is determined by a detector. The read-out from the detector is transformed into a mass deposited on the elongate member. Particles are deposited by letting a fluid with the particles flow past the elongate member.
    Type: Application
    Filed: November 2, 2012
    Publication date: October 16, 2014
    Inventors: Silvan Schmid, Anja Boisen
  • 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: 8115931
    Abstract: A photoacoustic detector for measuring a concentration of fine dust particles in gas. The detector includes at least one acoustic sensor for detecting an acoustic signal. Additionally, the detector includes a pulsed light source for providing excitation light having a configurable pulse length and a configurable pulse repetition rate, wherein by changing the pulse length and/or the pulse repetition rate, a size distribution of the fine dust particles can be determined.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: February 14, 2012
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Andras Miklos, Judit Angster
  • Patent number: 8106785
    Abstract: To enable an air velocity of sampling air to be precisely measured, a smoke detector (S) includes: a smoke detection part (22) connected to a sampling pipe (11); a fan (12) that sucks sampling air (SA) into the sampling pipe; and an air velocity sensor (15) that measures an air velocity of the sampling air within the sampling pipe. The air velocity sensor (15) is disposed at a primary side of the fan (12), and a straightening vane (25) is disposed between the air velocity sensor (15) and a suction port (12a) of the fan (12).
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: January 31, 2012
    Assignee: Nohmi Bosai Ltd.
    Inventor: Hiroyuki Yokota
  • Patent number: 8077018
    Abstract: To enable an air velocity of sampling air to be precisely measured, a smoke detector (S) includes: a smoke detection part (22) connected to a sampling pipe (11); a fan (12) that sucks sampling air (SA) into the sampling pipe; and an air velocity sensor (15) that measures an air velocity of the sampling air within the sampling pipe. The air velocity sensor (15) is disposed at a primary side of the fan (12), and a straightening vane (25) is disposed between the air velocity sensor (15) and a suction port (12a) of the fan (12).
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: December 13, 2011
    Assignee: Nohmi Bosai Ltd.
    Inventor: Hiroyuki Yokota
  • Publication number: 20110226235
    Abstract: Nebulization of a medicament for delivery to a subject is monitored. In one embodiment, whether there is any medicament to be nebulized, a rate of nebulization, and/or other aspects of the nebulization of the medicament are monitored. Information related to the one or more monitored aspects of the nebulization may be provided to a subject. For example, by monitoring whether there is any medicament to be nebulized, whether the nebulization of the medicament is complete may be determined.
    Type: Application
    Filed: November 21, 2009
    Publication date: September 22, 2011
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventor: Mark STEVEN Morrison
  • Patent number: 7805256
    Abstract: A method of processing time-discrete measured values, which can be described in their time characteristic by a first exponential function which has a first time constant, the method comprising the steps of: detecting a first measured value and storing the first measured value, detecting a second measured value and storing the second measured value according to a defined time interval with respect to the detection of the first measured value, filtering the first measured value and second measured value by calculating a sum of the first measured value and a weighted difference between the second measured value and the first measured value, thereby generating time-discrete output values which can be described in their time characteristic by a second exponential function having a second time constant different from the first time constant, and outputting the output values is disclosed.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: September 28, 2010
    Assignee: Vincotech (Germany) GmbH
    Inventor: Robert Frodl
  • Publication number: 20100083737
    Abstract: A device for measuring superfine particle masses including a quartz oscillator and an exposure system having at least two measuring chambers. Each of the at least two measuring chambers has a same geometry, a deposition surface for particles, and an aerosol feed directed at the respective disposition surface configured to feed an aerosol onto the respective deposition surface. At least one of the respective deposition surfaces is disposed on the quartz oscillator.
    Type: Application
    Filed: February 27, 2008
    Publication date: April 8, 2010
    Applicant: FORSCHUNGSZENTRUM KARLSRUHE GMBH
    Inventors: Hanns-Rudolf Paur, Thomas Waescher, Sonja Muelhopt
  • Patent number: 7543476
    Abstract: An apparatus for separating an analyte from a mixture or for detecting an analyte or for determining the affinity, or a property related to affinity, between binding partners includes: a) a surface having the analyte or one of the binding partners immobilized thereon, in use; b) a transducer for oscillating the surface; c) a controller connected to the transducer for varying the amplitude and/or frequency of the oscillation to cause a dissociation event; and, d) an analyzer connected to the transducer for detecting an oscillation of the transducer due to the dissociation event. The controller includes an oscillator connected in a resonant circuit with the transducer such that the transducer oscillates at two frequencies simultaneously, one of these causing the transducer to oscillate the surface and the other being supplied as an output to the analyzer.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: June 9, 2009
    Assignee: Akubio Limited
    Inventor: Victor Petrovich Ostanin
  • Patent number: 7251982
    Abstract: There is provided apparatus for the measurement of particle mass concentration of an aerosol and which comprises at least one aerosol inlet and at least one electrostatic precipitator which directs an aerosol flow towards a mass sensor on which the particles are collected, the sensor being housed in a magazine including a plurality of other sensors, each of which may be substituted for the sensor, and a control. The control selectively connects one of the at least one aerosol inlet with one of the sensors.
    Type: Grant
    Filed: November 15, 2004
    Date of Patent: August 7, 2007
    Assignee: Sensors, Inc.
    Inventor: David R. Booker
  • Patent number: 7238238
    Abstract: A deposition apparatus supplies a reactive gas obtained by vaporizing a liquid material at a vaporizer 30 into a chamber 10 via a processing-gas pipe 40 and forms a thin film on a semiconductor wafer W due to a thermal decomposition of the reactive gas. The deposition apparatus is provided, in the processing-gas pipe 40, with a crystal gauge 51 detecting a pressure Pq under the influence of mist in the reactive gas and a capacitance manometer 52 detecting a pressure Pg under no influence of the mist. The apparatus further includes a gasification monitor 50 detecting a quantity of mist in the reactive gas on the basis of a difference ?P between the pressure Pq and the pressure Pg measured by the crystal gauge 51 and the capacitance manometer 52 in order to prevent deposition defects due to the mist in the reactive gas.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: July 3, 2007
    Assignee: Tokyo Electron Limited
    Inventor: Teruo Iwata
  • Patent number: 7213445
    Abstract: A technique for determining particulate density in a fluid monitors the changes in the speed of sound. Since the speed of sound is intimately related to the composites of the air mixture and since the speed of sound of clean air at any temperature and humidity can be calculated exactly, it is possible to estimate the density of any foreign particulates in the air by observing changes in the speed of sound. Formulations are derived that correlate the change in the speed of sound of the air mixture to their density fluctuations, thus allowing people to estimate the mass density of foreign particulates under any temperature and humidity. Alternatively, the change in density of the air mixture can be detected, thereby indicating the presence of contaminants and a possible alarm, even if the contaminants are not yet identified.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: May 8, 2007
    Assignee: Wayne State University
    Inventors: Sean F. Wu, Ravinder S. Beniwal
  • Patent number: 7197911
    Abstract: A particulate mass monitor includes a controller that monitors a change in a resonant oscillation frequency of a taut metallic membrane, as caused by deposition of the particulate matter on the metallic membrane. The metallic membrane, such as a foil or metallized plastic film, is substantially mechanically stable under tension. Application of a tension to the periphery of the metallic membrane generates a substantially constant tension within the membrane, thereby allowing the particulate mass monitor to detect a particulate mass concentration of the air sample with a relatively high degree of accuracy. Additionally, the particulate mass monitor includes a membrane transporter that automatically advances the metallic membrane within the particulate mass monitor. The membrane transporter minimizes the necessity for manual replacement of the metallic membrane over time and allowing long term, unattended operation of the particulate mass monitor.
    Type: Grant
    Filed: January 5, 2005
    Date of Patent: April 3, 2007
    Assignee: Thermo Electron Corporation
    Inventor: Pedro Lilienfeld
  • Patent number: 7111496
    Abstract: A particulate mass monitor includes two mass sensors, such as an optical sensor (e.g., a light scattering photometer or nephelometer) and a beta radiation attenuation sensor for substantially continuous monitoring of ambient particulate matter. During operation, the first mass sensor references the time-averaged measurement of the second mass sensor such that the second mass sensor calibrates the response of the first mass sensor. If the first sensor is an optical sensor, as it detects the presence of particulate matter within a fluid, the mass concentration measurement (e.g., signal output) provided by the optical sensor is altered using a ratio of concentration measurements of the second mass sensor and the optical sensor. The combined use of the two mass sensors provides accurate mass measurements of ambient particulate matter with a relatively high time resolution.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: September 26, 2006
    Inventors: Pedro Lilienfeld, Hansgerd Kramer
  • Patent number: 7096719
    Abstract: An apparatus 10 is provided that measures the speed of sound propagating in a multiphase mixture to determine parameters, such as mixture quality, particle size, vapor/mass ratio, liquid/vapor ratio, mass flow rate, enthalpy and volumetric flow rate of the flow in a pipe or unconfined space, for example, using acoustic and/or dynamic pressures. The apparatus includes a pair of ultrasonic transducers disposed axially along the pipe for measuring the transit time of an ultrasonic signal to propagate from one ultrasonic transducer to the other ultrasonic transducer. A signal process, responsive to said transit time signal, provides a signal representative of the speed of sound of the mixture. An SOS processing unit then provides an output signal indicative of at least one parameter of the mixture flowing through the pipe. The frequency of the ultrasonic signal is sufficiently low to minimize scatter from particle/liquid within the mixture.
    Type: Grant
    Filed: January 13, 2004
    Date of Patent: August 29, 2006
    Assignee: CiDRA Corporation
    Inventor: Daniel L. Gysling
  • Patent number: 7072044
    Abstract: Fiber optic particle detector for measurements in a fluid flow, comprising an optical fiber (2,3,12) being acoustically coupled to a mechanical element (11,13,14) adapted to be acoustically coupled to the flow, a fiber optic interferometer (54,56) and a light source (12,51,55) providing light in said optical fiber.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: July 4, 2006
    Assignee: Optopian AS
    Inventors: Jon Thomas Kringlebotn, Erlend Rønnekleiv, Sverre Knudsen
  • Patent number: 7066008
    Abstract: A method of measuring concentration of solid or liquid particulate matter in a gaseous carrier medium, particularly suitable for measuring concentration and flow rate of pulverized fuel pneumatically transported in a duct to power station boiler burners. The method includes generating a radio frequency electromagnetic wave within a duct, measuring wave parameters within a range of frequencies, including a cut-off frequency, determining the cut-off frequency from changes in wave parameters, calculating dielectric permittivity of a two-phase flow duct load, and ascribing to this value a corresponding concentration value. The measured parameter is the rate of change of phase shift against frequency at two arbitrary points on a wave transmission path, whereas the waveguide cut-off frequency value is determined at a point where the rate of change of phase shift against frequency reaches a maximum.
    Type: Grant
    Filed: September 2, 2004
    Date of Patent: June 27, 2006
    Assignee: Zaklad Aparatury Pomiarowet Kwant Sp z.o.o.
    Inventors: Bogdan Niewczas, Mariusz Randak, Paulina Piwowarczyk, Tomasz Piwowarczyk
  • Patent number: 6843102
    Abstract: A gas sensor configuration comprises a radiation-emitting radiation device, a gas measuring chamber, a detector unit and an evaluation device. A measuring gas that contains at least one gas component is present in the gas measuring chamber. The evaluation device detects the gas component and/or its concentration depending on the output signal of the detector unit. The radiation emitting device comprises at least one source that emits a measuring radiation and at least one reference radiation source, the latter being switched on periodically to measure the aging state of the source that emits the measuring radiation. The evaluation device detects the aging of the source that emits the measuring radiation on the basis of deviations with respect to the output signals of the detector unit when the reference radiation source and the source that emits the measuring radiation are switched on, and, if necessary, compensates for the aging.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: January 18, 2005
    Assignee: Gasbeetle GmbH
    Inventors: Aleksandr Shulga, Udo Schmale, Holger Müller
  • Publication number: 20040045378
    Abstract: This invention concerns the measurement of particle size of particles entrained in a gas. The apparatus (5) includes an acoustic sensor (10) used to monitor the acoustic signals produced by collisions of pneumatically conveyed particles with the sensor (10). Signal processing electronics and software (15) are used to determine, for each impact, the peak height of the acoustic signal. The particle size is calculated from the peak height distribution and either the signal (pulse) duration distribution or the airstream (impact) velocity, according to Hertzian Impact Theory.
    Type: Application
    Filed: October 6, 2003
    Publication date: March 11, 2004
    Inventor: Peter John Coghill
  • Patent number: 6694799
    Abstract: The invention includes a particle detection system that detects bioparticles in a sample utilizing a sensor device that receives photoacoustic signals from a sample. The invention includes a system for distinguishing biologically active particles from non-biologically active particles in a sample utilizing a transducer to receive a laser induced photoacoustic signal from the sample and a fluorescence detector to receive laser induced fluorescence. The invention includes a method of screening a sample for the presence of one or more particle types by subjecting a sample to laser light and measuring at least one photonic response and at least one acoustic response are measured from the sample to produce a sample composite data set which is compared to a signature data set from a control sample. The invention also includes methods for detecting a change in the particle composition within a test area.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: February 24, 2004
    Assignee: Eastern Washington University
    Inventor: Jeanne Rudzki Small
  • Patent number: 6668618
    Abstract: Systems and methods of monitoring thin film deposition are described. In one aspect, a thin film deposition sensor includes an acoustical resonator (e.g., a thin film bulk acoustical resonator) that has an exposed surface and is responsive to thin film material deposits on the exposed surface. A substrate clip may be configured to attach the thin film deposition sensor to a substrate. A transceiver circuit may be configured to enable the thin film deposition sensor to be interrogated wirelessly. A method of monitoring a thin film deposition on a substrate also is described.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: December 30, 2003
    Assignee: Agilent Technologies, Inc.
    Inventors: John D. Larson, III, Herbert L. Ko, Richard K. Karlquist, Mark A. Hueschen, Kent W. Carey
  • Patent number: 6557416
    Abstract: A high resolution biosensing system for detecting and identifying a biochemical material to be tested by using proportional relationship between frequency variation of oscillation and mass of the biochemical material to be tested comprises a biosensor; an oscillatorfor generating oscillation based on the sensed result; a phase-lock loop circuit receiving the oscillation of the oscillator and generating pulse signals;an ultra-high frequency counter for counting the pulse signals; and a microprocessor for storing and displaying output from the ultra-high frequency counter and for controlling the oscillator. The phase-lock loop circuit generates the pulse signals of a frequency, which is n times the frequency of the oscillator and with a constant phase difference therebetween to trigger the ultra-high frequency counter. Accordingly, the resolution can be raised up to n times.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: May 6, 2003
    Assignee: ANT Technology Co., Ltd.
    Inventors: I-Nan Chang, Chung Chih Lo, Wu Chin Chen, Yen-Wen Chen
  • Patent number: 6510727
    Abstract: An arrangement is described for the quantitative and qualitative analysis of particles in gases, especially of particles in the exhaust gas of internal combustion engines, comprising a vibrating system with at least one vibration sensor, preferably a piezoelectric resonator, which is provided with at least one collecting surface for the particles to be analyzed, a circuit for the determination of characteristic vibration parameters as well as guide and transport arrangements for the gas to be analyzed. In order to obtain as large as possible a measuring range with a linear characteristic line and therewith a great sensitivity and dynamics with respect to the mass load in the entire measuring range, there is provided a vibration sensor stationary relative to the measuring chamber, and at least one active deflecting device for the gas or the particles contained in the gas.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: January 28, 2003
    Assignee: AVL List GmbH
    Inventors: Christian Reiter, Herbert Thanner
  • Publication number: 20020124632
    Abstract: An arrangement is described for the quantitative and qualitative analysis of particles in gases, especially of particles in the exhaust gas of internal combustion engines, comprising a vibrating system with at least one vibration sensor, preferably a piezoelectric resonator, which is provided with at least one collecting surface for the particles to be analyzed, a circuit for the determination of characteristic vibration parameters as well as guide and transport arrangements for the gas to be analyzed. In order to obtain as large as possible a measuring range with a linear characteristic line and therewith a great sensitivity and dynamics with respect to the mass load in the entire measuring range, there is provided a vibration sensor stationary relative to the measuring chamber, and at least one active deflecting device for the gas or the particles contained in the gas.
    Type: Application
    Filed: December 14, 2000
    Publication date: September 12, 2002
    Inventors: Christian Reiter, Herbert Thanner
  • Patent number: 6408681
    Abstract: A single particle photoacoustic absorption spectrometer for directly measuring the absorption spectra for in situ individual aerosol type particles that is comprised of an electrodynamic trap capable of suspending a charged particle in free-space in a non-intrusive manner; a source of modulated monochromatic electromagnetic radiation, e.g., a laser, and an acoustic transducer/resonator for detecting/amplifying sound waves emitted by the irradiated particle. Depending on the characteristics of the particle, a certain fraction of the electromagnetic energy will be absorbed by the particle resulting in its rapid heating and cooling at the modulation frequency. The heat generated within the particle is rapidly transferred to the surrounding air resulting in a sound wave. The intensity of the sound wave is proportional the absorbed energy by the particle.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: June 25, 2002
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Kristan P. Gurton, James B. Gillespie
  • Patent number: 6401538
    Abstract: A method is provided for analyzing suspended particulate and liquid medium in a fluid stream by transmitting acoustic signals into the fluid, detecting scattered acoustic energy, and determining a parameter related to the density and compressibility of the fluid. In one embodiment, the fluid analysis tool comprises two transmitting transducers intermittently emitting acoustic signals, and two receiving transducers being differently azimuthally positioned with respect to the transmitters. The ratio of the amplitude of scattered signals measured by the two receivers as a result of emission from the first and second transmitters are used to calculate the parameter. In another embodiment, a tool comprising one transmitter and at least three receivers with azimuthal angles in both forward and backward scattering regions with respect to the incident wave is disclosed. The scattering signal amplitudes normalized by the amplitude from one of the receivers is used to identify and monitor the system.
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: June 11, 2002
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Wei Han, James Robert Birchak, Bruce H. Storm, Jr.
  • Patent number: 6293136
    Abstract: A surface acoustic wave device sensor configured so as to have at least two different modes of operation. An acoustic response is obtained from each of the different modes of operation. The different modes of operation are a combination of a temperature effect and a measurand effect. The measurand effect is caused by the absorption and/or adsorption of a substance into a selective coating on the piezoelectric substrate. The two different modes of operation are effected differently by the temperature effect and therefore can be used to effectively eliminate the temperature effect by simultaneously solving equations representative of the different modes of operation. The present invention eliminates the need to provide other relatively more complicated temperature compensating structure or to maintain the device at a predetermined constant temperature. The present invention can be used to detect different chemicals or substances.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: September 25, 2001
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Yoonkee Kim
  • Patent number: 6257048
    Abstract: A method and apparatus for measuring surface changes, such as mass uptake at various pressures, in a thin-film material, in particular porous membranes, using multiple differently-configured acoustic sensors.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: July 10, 2001
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Susan Leslie Hietala, Vincent Mark Hietala, Chris Phillip Tigges