Density Or Specific Gravity Patents (Class 73/30.01)
  • Patent number: 9739758
    Abstract: Improved gas leak detection from moving platforms is provided. Automatic horizontal spatial scale analysis can be performed in order to distinguish a leak from background levels of the measured gas. Source identification can be provided by using isotopic ratios and/or chemical tracers to distinguish gas leaks from other sources of the measured gas. Multi-point measurements combined with spatial analysis of the multi-point measurement results can provide leak source distance estimates. Qualitative source identification is provided. These methods can be practiced individually or in any combination.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: August 22, 2017
    Assignee: Picarro, Inc.
    Inventors: Chris W. Rella, Eric R. Crosson, Michael R. Woelk, Sze Meng Tan, Yonggang He, David Steele
  • Patent number: 9732961
    Abstract: A method for determining an estimate of the specific gravity of a fuel for a gas turbine engine is disclosed. The gas turbine engine includes a fuel control valve and one or more fuel injectors. The method includes determining a first estimate of the specific gravity based on an orifice flow model of the fuel control valve. The method also includes determining a second estimate of the specific gravity based on a combined orifice flow model of the one or more fuel injectors. The method further includes recursively filtering the first estimate and the second estimate to determine a third estimate of the specific gravity.
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: August 15, 2017
    Assignee: Solar Turbines Incorporated
    Inventors: Chad M. Holcomb, Richard C. Whalen, Robert Hiroshi Moroto
  • Patent number: 9500556
    Abstract: Improved gas leak detection from moving platforms is provided. Automatic horizontal spatial scale analysis can be performed in order to distinguish a leak from background levels of the measured gas. Source identification can be provided by using isotopic ratios and/or chemical tracers to distinguish gas leaks from other sources of the measured gas. Multi-point measurements combined with spatial analysis of the multi-point measurement results can provide leak source distance estimates. These methods can be practiced individually or in any combination.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: November 22, 2016
    Assignee: Picarro, Inc.
    Inventors: Chris W. Rella, Eric R. Crosson, Sze Meng Tan
  • Patent number: 9482591
    Abstract: Improved gas leak detection from moving platforms is provided. Automatic horizontal spatial scale analysis can be performed in order to distinguish a leak from background levels of the measured gas. Source identification can be provided by using isotopic ratios and/or chemical tracers to distinguish gas leaks from other sources of the measured gas. Multi-point measurements combined with spatial analysis of the multi-point measurement results can provide leak source distance estimates. These methods can be practiced individually or in any combination.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: November 1, 2016
    Assignee: Picarro, Inc.
    Inventors: Chris W. Rella, Eric R. Crosson, Michael Woelk, Sze Meng Tan
  • Patent number: 9162365
    Abstract: The invention relates to a method for cascading and molding an LED filament support based on a support flitch. A plurality of supports may be separated apart from the support flitch as a whole body, thus reducing welded amount and increasing efficiency. The support flitch comprises a group of supports arranged in parallel and numbered as a first support, a second support, a third support, and so on, till an n-th support one after another. According to three different cutting ways, an inner extension section, an outer extension section, an inner connection side, and a middle connection side at the upper side of the support, as well as the inner extension section, the outer extension section, the inner connection side, and the middle connection side at the lower side of the support are cut out respectively, one group or two groups of the cascaded LED filament supports may be obtained.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: October 20, 2015
    Assignee: LIN'AN NEW SANLIAN LIGHTING ELECTRIC CO., LTD.
    Inventors: Yongjun Zhou, Yifan Fan
  • Publication number: 20150059444
    Abstract: A gas concentration image (i.e., concentration vs. position data) in a cross section through a gas plume is obtained. Such measurements can be obtained by using a 2D array of gas sample inlets, or by moving a 1D array of gas sample inlets through the gas plume. By combining a gas concentration image with ambient flow information through the surface of the gas concentration image, the leak rate (i.e., gas flux) from the leak source can be estimated. Gas samples are simultaneously acquired by filling two or more gas sample storage chambers. This is the default operation mode, which is convenient to regard as recording mode. The other operating mode is a playback mode, where the gas samples in the gas sample storage chamber are sequentially provided to a gas analysis instrument. Gas collection via line pixels can be used to compensate for vertical wind speed variation.
    Type: Application
    Filed: November 5, 2014
    Publication date: March 5, 2015
    Inventor: Chris W. Rella
  • Publication number: 20150047416
    Abstract: A gas concentration image (i.e., concentration vs. position data) in a cross section through a gas plume is obtained. Such measurements can be obtained by moving a 1D array of gas sample inlets through the gas plume. By combining a gas concentration image with ambient flow information through the surface of the gas concentration image, the leak rate (i.e., gas flux) from the leak source can be estimated. Multiple gas analysis instruments can be employed in connection with sweeping a 1-D array of measurement ports through the gas plume in order to reduce analysis time.
    Type: Application
    Filed: November 4, 2014
    Publication date: February 19, 2015
    Inventors: Chris W. Rella, Eric R. Crosson, David Steele, Marc L. Fischer
  • Publication number: 20140224770
    Abstract: A gas density monitoring system for high voltage gas circuit breakers. The gas density monitoring system comprising a gas density device mounted directly on a circuit breaker tank end cover. When the gas density device is fully secured to the tank end cover, the gas density device works in conjunction with a self-sealing valve body to provide a self-sealing, direct pathway between the pressurized tank and a sensing element of the gas density device. This pathway permits the gas density device to sense the circuit breaker tank pressure via an angled port through the tank end cover that limits pressure transients that may result from the normal operation of the circuit breaker. The gas density device contact settings may be verified without removal of the density device from the gas circuit breaker or venting the enclosed gas inside the gas circuit breaker to the atmosphere.
    Type: Application
    Filed: February 11, 2014
    Publication date: August 14, 2014
    Applicant: MITSUBISHI ELECTRIC POWER PRODUCTS, INC.
    Inventors: Jeremy A. Hensberger, Kevin J. Goldstein, Edward J. Besong
  • Publication number: 20140190238
    Abstract: A vibratory meter (5) is provided, including one or more flow conduits (103), one or more pickoff sensors (105, 105?), and a driver (104). Meter electronics (20) is configured to vibrate the one or more flow conduits (103) using a drive signal including an initial vibration frequency and to receive a pickoff sensor signal from the one or more pickoff sensors (105, 105?) in response, iteratively offset a phase difference between the drive signal and the pickoff sensor signal by a predetermined phase increment and measure a resulting vibrational frequency and amplitude, with the offsetting operatively sweeping the vibration frequency over a predetermined vibration frequency range and therefore generating a plurality of vibration amplitudes and a corresponding plurality of vibration frequencies, and determine a substantially maximum amplitude response in the plurality of vibration amplitudes and designate the corresponding vibration frequency as comprising the resonant frequency.
    Type: Application
    Filed: July 13, 2011
    Publication date: July 10, 2014
    Applicant: Micro Motion, Inc.
    Inventors: Craig B. Mcanally, Andrew S. Kravitz
  • Publication number: 20140053631
    Abstract: A gas detection apparatus includes: a heating resistor; and an energization control unit which alternately switches a temperature of the heating resistor to two different temperatures. The gas detection apparatus calculates a density of combustible gas contained in the atmosphere using a heating resistor voltage in a high temperature period and a heating resistor voltage in a low temperature period; acquires three or more values of the heating resistor voltage in each target period; obtains a first average value of the values of the heating resistor voltage obtained in the target period of the high temperature period; obtains a second average value of the values of the heating resistor voltage obtained in the target period of the low temperature period; and uses the first and second average values for a calculation of density of the combustible gas.
    Type: Application
    Filed: August 22, 2013
    Publication date: February 27, 2014
    Applicant: NGK Spark Plug Co., Ltd.
    Inventors: Masaya WATANABE, Shoji KITANOYA, Daisuke ICHIKAWA, Masahiro YAMASHITA
  • Patent number: 8656756
    Abstract: A gas sensor including a metal shell; a detection element main body held by the metal shell; a porous protection layer coated on a leading end portion of the detection element main body; and a protector including a side wall surrounding an element protruding portion of the detection element main body protruding from a leading end of the metal shell. The side wall has introduction holes formed therein which allow gas to be introduced. The porous protection layer includes a first portion; and a second portion provided on a base end side with respect to the first portion and having a progressively reduced thickness in a direction toward a leading end of the detection element. The second portion is disposed closer to the base end of the detection element than the introduction holes in the axial direction.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: February 25, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Masaki Mizutani, Shigeki Mori
  • Publication number: 20140026641
    Abstract: Improved gas leak detection from moving platforms is provided. Automatic horizontal spatial scale analysis can be performed in order to distinguish a leak from background levels of the measured gas. Source identification can be provided by using isotopic ratios and/or chemical tracers to distinguish gas leaks from other sources of the measured gas. Multi-point measurements combined with spatial analysis of the multi-point measurement results can provide leak source distance estimates. These methods can be practiced individually or in any combination.
    Type: Application
    Filed: October 19, 2012
    Publication date: January 30, 2014
    Inventor: Picarro, Inc.
  • Patent number: 8534116
    Abstract: A system for measuring size segregated mass concentration of an aerosol. The system includes an electromagnetic radiation source with beam-shaping optics for generation of a beam of electromagnetic radiation, an inlet sample conditioner with adjustable cut-size that selects particles of a specific size range, and an inlet nozzle for passage of an aerosol flow stream. The aerosol flow stream contains particles intersecting the beam of electromagnetic radiation to define an interrogation volume, and scatters the electromagnetic radiation from the interrogation volume. The system also includes a detector for detection of the scattered electromagnetic radiation an integrated signal conditioner coupled to the detector and generating a photometric output, and a processor coupled with the conditioner for conversion of the photometric output and cut-size to a size segregated mass distribution.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: September 17, 2013
    Assignee: PNC Bank, National Association
    Inventors: Xiaoliang Wang, Jugal Agarwal, George J. Chancellor, James Evanstad, Anthony E Hase, Sreenath Avula, James E. Farnsworth, David A Lieder
  • Publication number: 20130233056
    Abstract: A method for measuring specific gravity of a combustible gas includes measuring the refractive index and sound speed of a gas of interest which contains at least one type of gas selected from a hydrocarbon gas, hydrogen gas, and carbon monoxide gas, and computing the value of the specific gravity Da of the gas of interest from Equation (1) below using a value selected as a correction factor x from within a range of 2.4 to 9.3 on the basis of a refractive index converted specific gravity Dn determined from the refractive index and a sound speed converted specific gravity Ds determined from the sound speed: Da=Ds?[(Ds?Dn)/(1?x)]??Equation (1).
    Type: Application
    Filed: August 4, 2011
    Publication date: September 12, 2013
    Applicant: RIKEN KEIKI CO., LTD.
    Inventor: Tomoo Ishiguro
  • Publication number: 20130160523
    Abstract: The invention relates to a device and method for measuring the density of a plasma by determining an impulse response to a high-frequency signal coupled into a plasma. The density, electron temperature and/or collision frequency as a function of the impulse response can be determined. A probe having a probe head and a probe shaft can be introduced into the plasma, wherein the probe shaft is connected to a signal generator for electrically coupling a high-frequency signal into the probe head. The probe core is enclosed by the jacket and has at its surface mutually insulated electrode areas of opposite polarity. A balun is arranged at the transition between the probe head and an electrically unbalanced high-frequency signal feed to convert electrically unbalanced signals into balanced signals.
    Type: Application
    Filed: October 6, 2011
    Publication date: June 27, 2013
    Applicant: RUHR-UNIVERSITÄT BOCHUM
    Inventors: Ralf Peter Brinkmann, Jens Oberrath, Peter Awakowicz, Martin Lapke, Thomas Musch, Thomas Mussenbrock, Ilona Rolfes, Christian Schulz, Robert Storch, Tim Styrnoll, Christian Zietz
  • Publication number: 20130138361
    Abstract: A method of determining energy content using a specific gravity meter double calibrated to measure both molecular weight and relative density.
    Type: Application
    Filed: April 13, 2011
    Publication date: May 30, 2013
    Applicant: Mobrey limited
    Inventor: Simon Patrick Hunter Wheeler
  • Publication number: 20130081447
    Abstract: Methods and apparatuses are provided that greatly expand the utility of conventional hollow waveguide-based sensors via either straight, substrate-integrated channels or via meandering (e.g., circuitous, curved or folded optical paths) waveguide sensor designs. Full- or hybrid-integration of the meandering hollow waveguide with light source, detector, and light-guiding optics facilitates compact yet high-performance gas/vapor and/or liquid sensors of the substrate-integrated hollow waveguide sensor.
    Type: Application
    Filed: September 29, 2012
    Publication date: April 4, 2013
    Inventors: Jerry Chance Carter, Michael P. Chrisp, Anastacia M. Manuel, Boris Mizaikoff, Andreas Wilk, Seong-Soo Kim
  • Publication number: 20120304730
    Abstract: A method validating a particulate monitoring device includes generating a final gas stream having a particulate material concentration that corresponds to a target particulate material concentration, using the particulate monitoring device to measure the particulate material concentration in the final gas stream, and evaluating an accuracy of the particulate monitoring device based on a comparison of the particulate concentration in the final gas stream that was measured by the particulate monitoring device with the target particulate material concentration.
    Type: Application
    Filed: June 3, 2011
    Publication date: December 6, 2012
    Inventors: Robert Wyatt Baxter, Derrick James Hinkle, Edward Lee Salter, Ralph E. Bard
  • Publication number: 20120031170
    Abstract: A determination oxygen storage amount used to determine whether a catalyst is degraded is a value obtained by applying a correction amount for removing error caused by response delay time of an output signal of an oxygen sensor to an oxygen storage amount calculated every short time. The correction amount is a value that is calculated using slopes stored in memory, i.e., the slopes for the number of storage cycles (>the short time) corresponding to the response delay time, or the like, and becomes more accurate as a value corresponding to the error as the storage cycle becomes relatively shorter with respect to the response delay time and the number of the slopes stored in the memory increases. The necessary storage capacity of the memory is inhibited from increasing excessively even if the number of the slopes stored in the memory is large.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 9, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takuya Matsumoto, Takashi Nakamura, Takeho Aisaka
  • Publication number: 20120024044
    Abstract: Methods and systems for detecting nuclear material concealed within an enclosure are provided. An ionized air density is measured at one or more locations outside of the enclosure. The presence of the concealed nuclear material is detected, for each of the one or more locations, based on a characteristic of the measured ionized air density indicative of concealed nuclear materials.
    Type: Application
    Filed: February 5, 2010
    Publication date: February 2, 2012
    Applicants: U.S. Naval Research Laboratory, Temple University of the Commonwealth System of Higher Education
    Inventors: Rongjia Tao, Dong Ho Wu
  • Publication number: 20110283772
    Abstract: A method is described for measuring a flow of gas passing a flow meter device. The device causes a pressure drop when a gas flows through it. The pressure drop across the device is a measure of the gas flow. The device is configured as a gas permeable tube that has a flow channel on the upstream side along the tube configured so as to decrease the cross-section of the channel downstream of the gas permeable tube. This provides for a minimum volume in the channel upstream of the device's pressure-drop-generating component.
    Type: Application
    Filed: May 16, 2011
    Publication date: November 24, 2011
    Applicant: MINDRAY MEDICAL SWEDEN AB
    Inventor: Göran Cewers
  • Publication number: 20110283774
    Abstract: The sensor element 110, which can detect the concentration of a specified gas, is held with a housing 102 with a front end thereof exposed. A protective cover 120 includes an inner cover 130 and an outer cover 140, and secured to the housing 102. A ratio ?1/?2 is set to a range from 0.6 to 0.9, where ?1 represents an outer diameter of a portion where an inner gas aperture 134a is formed in the inner cover 130, and ?2 represents an inner diameter of a portion where an outer gas aperture 144a is formed in the outer cover 140.
    Type: Application
    Filed: May 17, 2011
    Publication date: November 24, 2011
    Applicant: NGK Insulators, Ltd.
    Inventors: Takayuki SEKIYA, Kei Kosaka, Shodai Hirata
  • Publication number: 20110277903
    Abstract: A system and method for combining specific fire barrier materials along with graphic materials and interior aircraft material/parts to lower the heat release and smoke density when tested using the FAA regulated OSU Heat Release and Smoke Density Tests and/or any other test as required by any countries government in order to install graphics onto an aircraft material/part.
    Type: Application
    Filed: April 12, 2011
    Publication date: November 17, 2011
    Applicant: GLOBAL ONBOARD PARTNERS, LLC
    Inventor: Kirk R. ADAMS
  • Patent number: 8047055
    Abstract: A system for measuring size segregated mass concentration of an aerosol. The system includes an electromagnetic radiation source with beam-shaping optics for generation of a beam of electromagnetic radiation, an inlet sample conditioner with adjustable cut-size that selects particles of a specific size range, and an inlet nozzle for passage of an aerosol flow stream. The aerosol flow stream contains particles intersecting the beam of electromagnetic radiation to define an interrogation volume, and scatters the electromagnetic radiation from the interrogation volume. The system also includes a detector for detection of the scattered electromagnetic radiation an integrated signal conditioner coupled to the detector and generating a photometric output, and a processor coupled with the conditioner for conversion of the photometric output and cut-size to a size segregated mass distribution.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: November 1, 2011
    Assignee: TSI, Incorporated
    Inventors: Xiaoliang Wang, Jugal K. Agarwal, George John Chancellor, James Evanstad, Anthony E. Hase, Sreenath Avula, James E. Farnsworth, David A. Lieder
  • Publication number: 20110187529
    Abstract: The disclosure relates to a method for monitoring the quality of a fuel containing alcohol in a storage tank (1) including a sump area (8), wherein the density of the fluid present in the sump area (8) of the storage tank (1) is measured and compared to prescribed values characterizing the density of a mixed phase comprising water and alcohol as a function of the composition thereof.
    Type: Application
    Filed: June 25, 2009
    Publication date: August 4, 2011
    Applicant: FAFNIR GMBH
    Inventors: Christian Maurer, Wolfgang Schrittenlacher
  • Publication number: 20110167895
    Abstract: A method of measuring density of a sterilant aerosol e.g. aqueous hydrogen peroxide, in a gas stream (such as a stream of air) for the purposes of measuring sterilant dosage comprising: passing a gas stream at flow rate past an electrically heated element and measuring a first cooling effect, passing an aerosol suspended in a gas stream at flow rate past an electrically heated element and measuring a second cooling effect and measuring the difference between the first cooling effect and second cooling effect and correlating the difference with aerosol density. The total dosage can thus be determined. A measured dosage of a sterilant aerosol can be delivered by way of a feedback loop to halt further delivery of sterilant aerosol when the amount of aerosol delivered reaches a predetermined dosage. The methods allow sterilization to be certified.
    Type: Application
    Filed: June 30, 2009
    Publication date: July 14, 2011
    Inventors: Brian Hingley, Michael Potas
  • Patent number: 7966882
    Abstract: A method for determining a velocity and density of a fluid without requiring the transmission of ultrasound through the fluid, and a system for performing such a method. The method involves the steps of delivering, receiving and analyzing ultrasound pulses sent from a longitudinal and a shear wave transducers to a member that is in contact with a fluid. The ultrasound pulses reflecting between surfaces provide a first ultrasound pulse echo series, that is transmitted, received and processed. The shear wave ultrasound pulses are also delivered through a shear wave transducer at a predesignated angle relative to the interface of the member and the fluid and the results of this are received to obtain a second ultrasound pulse echo series. Reflection coefficients for the first and second ultrasound pulse echo series are then calculated and the density of the fluid and the velocity of sound in the fluids are extracted.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: June 28, 2011
    Assignee: Battelle Memorial Institute
    Inventor: Margaret Stautberg Greenwood
  • Patent number: 7932490
    Abstract: An apparatus and method for estimating size segregated aerosol mass concentration in real time and using a single detector. A beam of electromagnetic radiation is passed through a particle stream made of a test or field aerosol. The single detector outputs an electrical signal proportional to the electromagnetic radiation scattered thereupon. The electrical signal may be conditioned to produce an integrated signal for measuring radiation scattered from all the particles in the interrogation volume, a pulse height from an individual particle within the volume, and/or a time-of-flight measurement from the individual particle. The integrated signal can be correlated to particle mass concentration. The pulse height signal and the time-of-flight signal may be converted to infer the size of the individual particle. Attendant size distributions for the particle sizes may also be obtained. Using known or assumed particle properties, the mass concentration may be estimated from the size distribution.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: April 26, 2011
    Assignee: TSI, Inc.
    Inventors: Xiaoliang Wang, Jugal Agarwal, George John Chancellor, James Evenstad
  • Patent number: 7905137
    Abstract: A measurement device measures engine oil consumption of an engine lubricated by engine oil. The measurement device includes a sensing pipe housing in which a sulfur dioxide sensing pipe arranged to sense the sulfur dioxide is disposed, an exhaust gas introduction passage connecting the engine and a first end of the sulfur dioxide sensing pipe, and arranged to introduce the exhaust gas from the engine to the sulfur dioxide sensing pipe, and a flow amount measurement device arranged to measure the flow amount of the exhaust gas flowing in the sulfur dioxide sensing pipe. The engine oil measurement device is small in size and able to measure engine oil consumption easily.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: March 15, 2011
    Assignees: Yamaha Hatsudoki Kabushiki Kaisha, Komyo Rikagaku Kogyo K.K.
    Inventors: Jun Taue, Hiroaki Honma
  • Patent number: 7864062
    Abstract: Provided is an apparatus for detecting a change in a specific gravity of a fluid surrounding the apparatus wherein the fluid moves upwardly and downwardly with respect to the apparatus. The apparatus includes a housing having a top and a plurality of openings for allowing the fluid to enter the housing. A first floatation device is provided having a first specific gravity and being located within the housing. The first floatation device includes a magnet. A second floatation device is provided having a second specific gravity and located within the housing adjacent said first floatation device. The said second floatation device includes a magnet aligned to have the same polarity as the magnet of the first floatation device. A switch fixedly attached to said top, the switch having an open state and a closed state where when one of said magnets is in proximity to the switch, the switch is in a closed state and wherein when both of said magnets are in proximity to said switch, the switch is in an open state.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: January 4, 2011
    Assignee: Kinetico Incorporated
    Inventors: Stephen W. Cook, Michael A. Hemann, Steven M. Hoopes, Jerome P. Kovach
  • Publication number: 20100313631
    Abstract: A fluid discrimination apparatus and a fluid discrimination method are provided for carrying out with accuracy a fluid discrimination such as a fluid type discrimination, a concentration discrimination, the fluid existence or nonexistence discrimination, and a fluid temperature discrimination for a discriminated fluid that is stored in a tank or the like. A characteristic measured value as an index value that indicates the characteristics of the fluid to be discriminated is measured, and a discrimination of a fluid is carried out by comparing the fluid discrimination data that indicates the relationship between a fluid that has been measured in advance and a characteristic value of the fluid with the characteristic measured value.
    Type: Application
    Filed: January 30, 2009
    Publication date: December 16, 2010
    Applicant: MITSUI MINING & SMELTING CO., LTD.
    Inventors: Kiyotaka Yanagi, Mayuko Tsuruda
  • Patent number: 7752884
    Abstract: A method of analyzing a gas specimen mixture includes measuring the concentrations of inert components in the gas specimen mixture and the pressure and temperature of the gas specimen mixture. A number of sample gas mixtures are generated with varying percentages of hydrocarbon gases, each including the measured inert component concentrations. For each generated sample gas mixture, the method includes calculating the speed of sound therein based on the measured pressure and temperature and the particular percentages of hydrocarbon gases therein, measuring the speed of sound in the gas specimen mixture, and iteratively comparing the measured speed of sound with the calculated speed of sound in different sample gas mixtures until convergence for a particular sample gas mixture. The molecular weight of the particular sample gas mixture is calculated, and set the molecular weight of the gas specimen mixture to the calculated molecular weight.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: July 13, 2010
    Assignee: General Electric Company
    Inventor: Yufeng Huang
  • Patent number: 7752885
    Abstract: A gas specimen mixture analysis system includes at least one sensor for measuring the concentrations of inert components in the gas specimen mixture, a pressure sensor for measuring the pressure of the gas specimen mixture, and a temperature sensor for measuring the temperature of the gas specimen mixture. A subsystem measures the speed of sound in the gas specimen mixture, and a processing subsystem, responsive to the at least one inert component sensor, the pressure sensor, the temperature sensor, and the subsystem for measuring the speed of sound, is configured to generate a number of sample gas mixtures with varying percentages of hydrocarbon gases, each including the measured inert component concentrations.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: July 13, 2010
    Assignee: General Electric Company
    Inventor: Yufeng Huang
  • Patent number: 7730766
    Abstract: A gas viscosity sensor comprises a signal processing circuit and a sensor element, including a gas pressure generating system and a differential pressure measuring system in fluid communication therewith, the differential pressure measuring system comprising a measuring chamber (14) bounded by a thin membrane (28), an inlet-outlet channel or orifice interconnecting the measuring chamber to a source of gas for which the viscosity is to be determined, the inlet-outlet channel or orifice having dimensions adapted to provide resistance to the outflow and inflow of gas in the measuring chamber, and a membrane displacement sensor (32) adapted to measure a time dependent displacement of the membrane due to pressure variations in the measuring cavity.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: June 8, 2010
    Assignee: Ecole Polytechnique Federale de Lausanne
    Inventors: Peter Ryser, Sigfrid Straessler
  • Publication number: 20090113988
    Abstract: The gas absorption/adsorption memory effect in gas analysis can be reduced by controlling gas flow conditions such that the partial pressure of the analyte of interest is held constant, if the measured analyte concentration is within a predetermined range. Keeping the analyte partial pressure constant is helpful for mitigating the memory effect because changes in analyte absorption/adsorption rates tend to be driven by changes in analyte partial pressure. The memory effect can also be mitigated by performing concentration measurements at two or more different gas flow conditions, and employing a mathematical model to estimate true concentration and “memory effect” contributions to measured concentrations at one or more of the flow conditions. The mathematical model can be based on an assumption that the true analyte concentration is independent of flow rate or pressure, while the “memory effect” contribution to measured concentration is inversely proportional to flow rate or pressure.
    Type: Application
    Filed: November 6, 2007
    Publication date: May 7, 2009
    Inventor: Serguei Koulikov
  • Publication number: 20090061261
    Abstract: A gas physical quantity detecting device is basically provided with detection element, a detection element chamber and a filter. The detection element is configured to detect a physical quantity of a gas flowing through a gas flow passage. The detection element chamber contains the detection element and configured to supply gas from inside the gas flow passage to the detection element. The filter is arranged between the gas flow passage and the detection element chamber. The filter has a predetermined thickness with the filter being made of a non-hydrophobic material.
    Type: Application
    Filed: June 26, 2008
    Publication date: March 5, 2009
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Kentaro HATTA, Katsutoshi HIROSE
  • Patent number: 7024917
    Abstract: An acoustic transducer is in contact with a near wall that has a much different acoustic impedance than a fluid. The transducer transmits an acoustic pulse into into the wall (such as a plate, a wall of a tube or a wall of a sample chamber) that is in contact with this fluid. As the acoustic pulse bounces back and forth within this “near wall”, each echo of this original pulse loses the same fraction of energy on each round trip so the echo energy decays exponentially. Knowing the acoustic impedance of the wall material and the reflection intensity at the transducer/wall interface (which is obtained when using air as the fluid), it is possible to calculate the acoustic impedance of an unknown fluid from the slope of a plot of the logarithm of echo energy versus echo number.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: April 11, 2006
    Assignee: Baker Hughes Incorporated
    Inventor: Rocco DiFoggio
  • Patent number: 6763698
    Abstract: A system and technique for determining fluid properties includes an ultrasonic transducer 30 on a first surface 42 of a solid member 40. An opposed second surface 44 of the member 40 is in contact with a fluid 25 to be monitored. A longitudinal ultrasonic pulse is delivered through the solid member, and a multiplicity of pulse echoes caused by reflections of the ultrasonic pulse between the solid-fluid interface and the transducer-solid interface are detected and processed by a processing apparatus 22. The apparatus 22 determines the decay rate of the detected echo amplitude as a function of echo number and compares this value to a calibrated decay rate to determine an acoustic property of the fluid. The speed of ultrasound in the fluid is also determined and the fluid density is determined as a function of the speed of ultrasound and the determined acoustic property.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: July 20, 2004
    Assignee: Battelle Memorial Institute
    Inventor: Margaret Stautberg Greenwood
  • Patent number: 6621990
    Abstract: A method for determining a present air density for an imaging mechanism is presented. During a first time period: in a determining and storing action, a nominal air density is stored. In an increasing action, a fan input is increased until a known pressure in a cavity coupled to a fan receiving the fan input has been reached. In a determining and storing action, a nominal fan parameter is determined and stored after the known pressure is reached. During a second time period: in an increasing action, the fan input is increased until the known pressure in the cavity has been reached. In a determining action, a present fan parameter is determined after the known pressure is reached. In a calculating action, the present air density is calculated from the present fan parameter, the nominal fan parameter, and either the known pressure or the nominal air density.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: September 16, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: James O. Beehler, Todd R. Medin
  • Patent number: 6539775
    Abstract: An apparatus for the continuous measurement of the interchangeability of LPG/Air Mixtures with Natural Gas, having a sensor that measures the relative density (specific gravity) of an LPG/air mixture, and associated controls for gas sampling, signal processing and computation of mixture properties and interchangeability factors. The entire apparatus, gas sampling components, and signal conditioning devices are carried in one or more housings, having one sample gas inlet port and one or more waste gas outlet ports, one gas density sensor, one or more microprocessor-based signal processing units, and one or more connected operator interfaces. The measurement data from the gas density sensor is combined in the microprocessor-based signal processing unit with user-provided information about the properties of the LPG feedstock.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: April 1, 2003
    Inventor: Wolfgang H. Driftmeier
  • Publication number: 20020192831
    Abstract: A method of controlling the hydrocarbon content of a possible explosive mixture of air/hydrocarbon vapor circulating from an intake point into an installation fitted with a vapor intake system comprising a vapor intake circuit incorporating a suction pump enabling vapor to be circulated at a vapor flow rate QV. A device is connected to the vapor intake circuit to determine the hydrocarbon content of the aspirated vapor comprising a combination of a flow meter on the one hand and a sensor for measuring relative pressure by reference to atmospheric pressure PA on the other. The hydrocarbon content of the vapor circulating in the vapor intake circuit is determined by taking account of the density and the viscosity of this vapor, which is derived on the basis of a characteristic linked to the loss in air pressure previously stored in memory.
    Type: Application
    Filed: January 30, 2002
    Publication date: December 19, 2002
    Inventor: Jacques Fournier
  • Publication number: 20020108430
    Abstract: An apparatus for the continuous measurement of the interchangeability of LPG/Air Mixtures with Natural Gas, having a sensor that measures the relative density (specific gravity) of an LPG/air mixture, and associated controls for gas sampling, signal processing and computation of mixture properties and interchangeability factors. The entire apparatus, gas sampling components, and signal conditioning devices are carried in one or more housings, having one sample gas inlet port and one or more waste gas outlet ports, one gas density sensor, one or more microprocessor-based signal processing units, and one or more connected operator interfaces. The measurement data from the gas density sensor is combined in the microprocessor-based signal processing unit with user-provided information about the properties of the LPG feedstock.
    Type: Application
    Filed: February 13, 2001
    Publication date: August 15, 2002
    Inventor: Wolfgang H. Driftmeier
  • Patent number: 6295859
    Abstract: An improved OBS based technique that monitors gas emissions from smoke stacks, tail pipes, and other sources, and that separates gas column density from thermal radiance contrast. The technique of the present invention utilizes a software generated digital filter (30) constructed to correlate with only the spectrum of gas (12) of interest, and have zero correlation with background components (22). Through using the improved OBS technique of the present invention, high performance and more positive cost effective gas monitoring systems and sensors may be built and implemented.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: October 2, 2001
    Assignee: The B. F. Goodrich Co.
    Inventors: Andreas F. Hayden, Robert J. Noll
  • Publication number: 20010016278
    Abstract: A battery which has undergone initial charging and discharging is placed inside a sealed vessel, which is evacuated by a vacuum pump. After this evacuated state has been maintained for a while, the density of hydrogen gas within the sealed vessel is measured by a hydrogen density sensor, based on which the presence or absence of a gas escape from the battery is determined. The battery may be heated instead of subjecting it to charging and discharging.
    Type: Application
    Filed: February 21, 2001
    Publication date: August 23, 2001
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO.,LTD.
    Inventors: Masato Onishi, Michio Osawa, Katsuyuki Tomioka, Noriyuki Fujioka, Tomoharu Saito
  • Patent number: 6272905
    Abstract: A method and apparatus for real time gas analysis involving determining individual concentrations of fluid constituents in a mixture of known constituents by measuring properties of the mixture and solving a set of equations, which relate the individual gas concentrations to the measured properties of the mixture, for the unknown individual gas concentrations. The individual concentrations of four gasses in a mixture are determined by: passing the mixture through a flowmeter, a capillary, an orifice, and a sonic oscillator; transducing temperature, pressure and acoustic frequency measurements taken from the sensors; determining the density, viscosity, and the specific heat of the mixture; forming three equations which respectively relate these three properties to individual gas concentrations; and solving the three equations and the constitutive equation which requires that the sum of the concentrations equal unity, for the four unknown individual gas concentrations.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: August 14, 2001
    Assignee: metaSensors, Inc.
    Inventor: Tadeusz M. Drzewiecki
  • Patent number: 6244097
    Abstract: The fuel gas or a substream of the fuel gas is passed through a volumetric flowmeter and the volumetric gas flow is measured. In addition, the pressure, temperature and the proportion of at least one inert gas as well as the density and the dielectric constant are measured under reference conditions. The amount of heat supplied to gas consumption devices can be determined from these six parameters reliably without complicated technology.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: June 12, 2001
    Assignees: N.V. Nederlandae Gasunie, Ruhrgas Aktiengesellschaft
    Inventors: Peter Schley, Manfred Jaeschke, Reiner Kleinrahm, Renee Janssen-van Rosmalen, Jan A. Schouten
  • Patent number: 6205846
    Abstract: In the method, pairs of pressure and temperature values are recorded using a pressure sensor and a temperature sensor fixed to a case from the outside and communicating with a dielectric gas, thereby enabling a density value to be calculated for the dielectric gas corresponding to each recorded pair of values. Simultaneously with making the pressure and temperature records, an electric current flowing through an electrical apparatus located inside the case and a climate parameter relating to the medium in which the case is located are also recorded for the purpose of giving each density value an index, thereby enabling a leakage rate to be determined with improved accuracy on the basis of indexed leakage rates, each of which is obtained from density values all having the same index.
    Type: Grant
    Filed: October 22, 1998
    Date of Patent: March 27, 2001
    Assignee: GEC Alsthom T&D SA
    Inventors: Jean-Pierre Dupraz, Edmond Thuries