Thermoconductivity Patents (Class 73/25.03)
  • Patent number: 10436665
    Abstract: A method comprises suspending a measuring element within a fluid and applying measuring power to the measuring element. Radiation loss compensation power is applied to a heating element. The radiation loss compensation power is selected to compensate parasitic radiative heat loss from the measuring element. Heat transfer from the measuring element into the fluid is evaluated and a property of the fluid is derived. A sensor which implements the method uses a resistive measuring element which is electrically connected to an evaluation circuit. The heating element is electrically connected to a power source. A processor receives an input from the evaluation circuit and calculates a property of the fluid while the power source provides radiation loss compensation power to the first heating element.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: October 8, 2019
    Inventor: Heinz Plöchinger
  • Patent number: 10274473
    Abstract: The present invention relates to a sensor for sensing hydrogen. The sensor of the present invention comprises: a core which reacts with hydrogen to change a resistance value; at least two electrodes connected to the core; and a variable resistor which is connected to at least one of the two electrodes and of which the resistance value changes in response to a control signal, wherein the core includes palladium having a thin film shape, and graphene which is applied on the palladium and has a thin film shape.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: April 30, 2019
    Assignee: Korea Research Institute of Standards and Science
    Inventors: SeungHoon Nahm, Un Bong Baek, Seok Cheol Lee, InHyun Cheong
  • Patent number: 10024830
    Abstract: A detector arrangement to be scaled or adapted in a simple manner depending on the application includes n·m (n?2, m?2) thermal conductivity detectors that are each arranged in a mounting on a detector block having a high thermal conductivity, wherein each case m detector block is secured radially symmetrically and spaced apart from one another on a carrier having a central opening, forming a detector module, and n detector modules are located on a common axis by the central openings of the carriers.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: July 17, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventor: Thomas Neuhauser
  • Patent number: 10024829
    Abstract: Certain embodiments described herein are directed to devices that can be used to control fluid flow through one or more detectors. In some configurations, the device can be configured as a manifold that can receive a positive pressure to decouple the flow of fluid through a chromatography column from fluid flow through a detector. In certain configurations, sample flow can be accelerated into a detector cell comprising one or more filaments.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: July 17, 2018
    Assignee: PerkinElmer Health Sciences, Inc.
    Inventors: Andrew Tipler, John Irion
  • Patent number: 9746437
    Abstract: A CMOS-based process for manufacturing a semiconductor gas sensor includes the steps of: I) providing a semi-product, II) etching a substrate to remove a portion of the substrate and a portion of a first insulation layer so as to form a gas-sensing cavity, thereby to expose at least one sensing electrode; and III) depositing a gas-sensitive layer to cover the at least one sensing electrode.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: August 29, 2017
    Assignee: NATIONAL CHIAO TUNG UNIVERSITY
    Inventors: Jin-Chern Chiou, Shang-Wei Tsai
  • Patent number: 9709544
    Abstract: A metal oxide semiconductor-based toxic gas detector is provided. The metal oxide semiconductor-based detector includes a metal oxide semiconductor-based gas sensor that has an electrical characteristic that varies with concentration of a toxic gas. Measurement circuitry is coupled to the metal oxide semiconductor-based gas sensor and is configured to measure the electrical characteristic and provide a digital indication of the measured electrical characteristic. A controller is coupled to the measurement circuitry and is configured to provide a toxic gas output based on the digital indication. The controller is also configured to provide a diagnostic output relative to the metal oxide semiconductor-based sensor based on fluctuations of the measured electrical characteristic over time.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: July 18, 2017
    Assignee: Rosemount Analytical Inc.
    Inventors: Henryk Kozlow, Lucjan Antoni Oleszczuk
  • Patent number: 9551679
    Abstract: A device for measuring thermal conductivity of gas components of a gas mixture in order to determine fractions of the gas components includes a plurality of thermal conductivity sensors, each thermal conductivity sensor being a component of a resistance bridge circuit and being connected to an evaluation unit associated with the device. Each thermal conductivity sensor has a heating element and an integrated temperature measuring element, which elements generate two measuring voltages (UM3, UM2) when the temperature of the thermal conductivity sensor changes as a result of heat dissipation by the gas mixture. Voltages are compared in the evaluation unit in order to detect measuring errors.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: January 24, 2017
    Assignee: CHEMEC GMBH
    Inventor: Eckard Brandau
  • Patent number: 9546972
    Abstract: A thermal conductivity detector includes at least four detector components that are arranged in receptacles of a thermal conduction block in a circle around a center axis of the thermal conduction block. The thermal conduction block comprises a central portion along the axis, the cross-axial dimensions of the central portion being less than the diameter of the circle. There are at least four equal peripheral portions that are connected solely to the central portion and are separated from each other, each of the peripheral portions carrying one of the detector components.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: January 17, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventor: Udo Gellert
  • Patent number: 9366658
    Abstract: An apparatus and a method for identifying a CO2 content of a fluid. The apparatus includes: an absorber device having a porous material, the absorber device being capable of being brought into contact with the fluid; pores of the porous material having at least one hydrophilic first chemically functional group; the first chemically functional group being joined to the porous material; the first chemically functional group having the property of reacting in alkaline fashion with water; an electrode device that is disposed on the absorber device for electrical contacting of the absorber device; and an evaluation device that is electrically connected to the electrode device and by which an electrical property of the absorber device is measurable to identify the CO2 content of the fluid.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: June 14, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Markus Widenmeyer, Martin Schreivogel
  • Patent number: 9134262
    Abstract: A multi-channel contaminant sensor includes a first contamination test platform including an exposed first base metal portion that react in a first manner when exposed to one or more airborne contaminates. A second contamination test platform includes an exposed second base metal portion that reacts in a second manner when exposed to the one or more airborne contaminants.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 15, 2015
    Assignee: EMC Corporation
    Inventors: Nader G. Dariavach, Jin Liang, Francis W. French, Paul T. Callahan, Gordon O. Barr
  • Patent number: 9121773
    Abstract: A method is provided for calibrating a thermal conductivity sensor in a first medium A from measurements in a second medium B. The method includes maintaining the sensor at a substantially fixed temperature T1, and measuring a heat flux IB(T1) from the thermal element in the second medium B. A corresponding heat flux IA(T1) in the first medium A is calculated using known thermal conductivities of the first medium A and the second medium B.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: September 1, 2015
    Assignee: Bascom-Turner Instruments
    Inventor: Alkis C. Makrides
  • Patent number: 9047754
    Abstract: A light emitting diode (LED) lighting system having a gas detection function may be used not only for lighting but also for detection of volatile organic compounds (VOCs) causing the sick house syndrome at home and other odorless and colorless non-combustible gas harmful to a human body. The LED lighting system may be used as an optical sensor showing with the fast response time and high sensitivity with respect to an environment harmful to a human body. In addition, since the presence of gas can be easily detected through a change of color in comparison to sound alarms for fire and gas contamination, emergency situations can be effectively handled.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: June 2, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Jung Hoon Kim
  • Publication number: 20150052974
    Abstract: The present invention relates to a thermal conductivity detector, comprising a sensor block having two cavities for the purpose of accommodating gases, wherein one of the cavities is open and the other cavity is sealed and in each of the cavities there is disposed a thermistor and also sealing elements for the purpose of sealing the cavities, which sealing elements comprise electric current feed through elements, which are electrically connected to the respective thermistor disposed in the respective cavity. At least the sealing element in the sealed cavity is a glass to metal feed through element, which is welded to the sensor block to form a gas-tight joint. The present invention further relates to a method for the production of the thermal conductivity detector.
    Type: Application
    Filed: August 22, 2014
    Publication date: February 26, 2015
    Inventors: Waldemar Pieczarek, Carsten Krejtschi, Detlef Dornseiff
  • Patent number: 8939012
    Abstract: The present invention provides a thermal conductivity detector capable of realizing high detection performance even with the use of a miniaturized heating element, and expanding an effective applicable temperature range of a heating element, and to provide a gas chromatograph using the same. The thermal conductivity detector comprises a flow-path through which a measurement gas is caused to flow, a heating element disposed inside the flow-path, the heating element being formed on the substrate, for detecting thermal conductivity of the measurement gas according to magnitude of an amount of heat taken away from the heating element by the measurement gas, wherein said heating element is provided with a beam including a part where the beam is folded at a predetermined angle, the part being formed at the central part of the beam.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: January 27, 2015
    Assignee: Yokogawa Electric Corporation
    Inventors: Naoki Kishi, Hitoshi Hara, Tetsuya Watanabe, Kentaro Suzuki
  • Publication number: 20140345363
    Abstract: A method for determining physical properties of combustion including: flowing a gas a critical nozzle and past a microthermal sensor wherein the mass flow of the gas through the critical nozzle is the same as the mass flow through the microthermal sensor; measuring the pressure drop in a reservoir of gas flowing to the nozzle; determining a first gas property factor based on the measured pressure drop; determining a second gas property factor based on a flow signal generated by the microthermal sensor; determining a thermal conductivity of the gas using the microthermal sensor; and determining a physical property of the combustion based on a correlation of the first and/or second gas property factors and the thermal conductivity.
    Type: Application
    Filed: May 20, 2014
    Publication date: November 27, 2014
    Inventors: Philippe PRETRE, Andreas KEMPE, Tobias SUTER
  • Patent number: 8826725
    Abstract: A gas detector for use in, for example, measuring the concentration of flammable gas or detecting leakage of flammable gas. The gas detector has a gas detection element in which at least a heat-generating resistor and an insulation layer are laminated on a semiconductor substrate made of silicon while the insulation layer encloses the heat-generating resistor. The gas detector detects flammable gas on the basis of temperature and resistance of the heat-generating resistor which vary according to flammable gas. In the gas detection element, a protection layer in the form of a gas impermeable oxide film is provided on its outermost surface which comes into contact with an environmental atmosphere that contains flammable gas. Thus, alkali resistance is ensured. Since the protection layer is impermeable to gas, entry of impurities (organic silicon) contained in the environmental atmosphere into the protection layer is restrained, whereby output is stabilized and becomes accurate.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: September 9, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Toshihiro Matsuno, Masaya Watanabe, Shoji Kitanoya
  • Patent number: 8800350
    Abstract: A particle sensor including a diaphragm, a diaphragm heater, and at least two measuring electrodes situated on the diaphragm, for electrical conductivity measurement, the diaphragm having a thickness of less than or equal to 50 ?m, in order to allow a calorimetric particle quantity determination.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: August 12, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Andreas Krauss, Tino Fuchs
  • Patent number: 8713990
    Abstract: A simple gas sensor for detecting a concentration of a detected gas with high accuracy, in which a thermal interference can hardly occur between a normal detection element pair and a reference detection element pair, is provided.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: May 6, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Shunji Tsukabayashi, Hidetoshi Oishi, Kazuhiro Okajima
  • Publication number: 20140102172
    Abstract: An integrated circuit and a method of making the same. The integrated circuit includes a semiconductor substrate. The integrated circuit also includes a relative humidity sensor on the substrate. The relative humidity sensor includes a first sensor electrode, a second sensor electrode, and a humidity sensitive layer covering the first and second electrodes. The integrated circuit further includes a thermal conductivity based gas sensor on the substrate. The thermal conductivity based gas sensor has an electrically resistive sensor element located above the humidity sensitive layer.
    Type: Application
    Filed: October 7, 2013
    Publication date: April 17, 2014
    Applicant: NXP B.V.
    Inventors: Roel Daamen, Aurelie Humbert, Pascal Bancken
  • Patent number: 8689608
    Abstract: The present invention provides a high-responsiveness and high-accuracy thermal gas sensor configured to enable gas to be analyzed based on a variation in heat conductivity. The thermal gas sensor includes a substrate 2 with a cavity portion 5, a thin-film support 6 stacked in the cavity portion and comprising a plurality of insulating layers 8a and 8b, and a first heating member 3 and a second heating member 4 both sandwiched between the insulating layers in the thin-film support. The second heating member is located around a periphery of the first heating member. The first heating member is controlled to a temperature higher than a temperature to which the second heating member is controlled. The concentration of ambient gas is measured based on power applied to the first heating member.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: April 8, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroshi Nakano, Masamichi Yamada, Masahiro Matsumoto, Keiji Hanzawa
  • Patent number: 8689609
    Abstract: The gas sensor includes: a cylindrical member which includes a gas detection chamber therein and extends along an axial thereof; a base member which closes an opening of a first axial end of the cylindrical member; a status sensor which is disposed at a substantially central portion of the base member, and detects at least the temperature or the humidity in the gas detection chamber; a gas detection element disposed around the status sensor on the base member; a lid member which closes an opening of a second axial end of the cylindrical member; and a gas inlet port which penetrates the lid member at a location not coinciding with the status sensor and the gas detection element when seen from the axial direction, and enables the introduction of an inspection target gas from an outside into the gas detection chamber.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: April 8, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hidetoshi Oishi, Akihiro Suzuki, Shunji Tsukabayashi, Kazuhiro Okajima
  • Publication number: 20140041438
    Abstract: A measurement head is provided for a device for measuring the concentration of at least one gas, in particular oxygen. A gas sample a measurement element (1) is arranged in the region of an opening on a circuit board (11). To convey gas a duct (16, 17) is formed in each of two metal bodies, which surround the measurement element (1) and serve as magnetic poles. During operation of the measurement head the gas sample flows substantially perpendicularly, first through one of the metal bodies (12, 13), and then through the opening (18) on a side of the measurement element (1) facing the opening and emerges again through the other metal body (14, 15).
    Type: Application
    Filed: February 21, 2012
    Publication date: February 13, 2014
    Applicant: DRAGER MEDICAL GMBH
    Inventors: Tobias Heise, Alfred Kelm, Hartmut Stark, Günter Steinert, Peter Dreyer
  • Publication number: 20140026640
    Abstract: An improved Pirani sensor uses a measuring element disposed within a fluid between a base plate and a cover. The measuring element is held by suspension members that are connected to the base plate. A heating element is thermally conductively connected to the suspension members. Using the sensor the characteristic of the fluid is determined by evaluating the heat transfer from the thermal element through the fluid into the cover when heating power is applied to measuring element. Parasitic conductive heat loss from the measuring element into the suspension members is compensated by applying power to the heating element.
    Type: Application
    Filed: July 29, 2013
    Publication date: January 30, 2014
    Inventor: Heinz Plöchinger
  • Publication number: 20130213114
    Abstract: The invention relates to a leak detector comprising a first sensor for detecting a gas component (helium) in a gas taken in. Because the sensor is susceptible to saturation or contamination, a second sensor is provided. The sensor is a thermal conductivity sensor. The thermal conductivity sensor has a lower detection sensitivity, yet, at a high concentration of the gas component, it does not risk being contaminated. The two sensors together allow for a large detection range, from extremely sensitive measurements to instances with high concentrations of the gas components as those which can occur with gross leaks.
    Type: Application
    Filed: September 1, 2011
    Publication date: August 22, 2013
    Applicant: INFICON GMBH
    Inventors: Daniel Wetzig, Scott Dalton, Daniel Hoffmann, Walwyn Jackson, JR.
  • Patent number: 8490467
    Abstract: A gas sensor includes a substrate having a low thermal conductivity. Localized heating can be produced using a serpentined heater carried by the substrate. The low thermal conductivity of the substrate substantially confines the generated heat to a region local to the heater thereby reducing required power to operate the sensor. Multiple sensing elements can be deposited onto the substrate adjacent to respective heaters and relatively close together because of the thermal isolation provided by the substrate. In one embodiment, the sensor can include the ceramic substrate, the heater, catalytic material overlying the heater with a gas impermeable layer overlying, at least in part the catalytic material.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: July 23, 2013
    Assignee: Life Safety Distribution AG
    Inventor: Keith F. E. Pratt
  • Patent number: 8370088
    Abstract: The invention relates to a method for the real-time determination of the filling level of a cryogenic tank intended to house a two-phase liquid/gas mixture, in which at least one of the the level, volume or mass contained in the tank is calculated for the liquid or the gas at each time step. The method includes the use of a thermal model at each time step to calculate the average temperatures of the liquid and the gas in the tank on the basis of the measured pressure differential and at least one of the pressures of said differential; calculation of the change over time in at least the density of the liquid on the basis of the average temperature of the liquid and the pressures in the tank.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: February 5, 2013
    Assignee: L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Fouad Ammouri, Florence Boutemy, Jonathan Macron, Alain Donzel
  • Patent number: 8340927
    Abstract: An apparatus for measuring a flow velocity and a flow rate of groundwater leaking from the earth surface includes: a storage tank that is fixed to close a side surface and a top surface of an earth surface region from which the groundwater leaks and that stores the groundwater leaking from the earth surface; a liquid column tube that causes the groundwater stored in the storage tank to introduce thereto and causes a water column to rise; and a pressure-type measuring unit that is formed in a top opening of the liquid column tube and that senses a differential pressure. Accordingly, it is possible to easily and rapidly measure a flow velocity and a flow rate of groundwater leaking from the earth surface by the use of a user's terminal in real time, or by time zones, or on the user's request.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: December 25, 2012
    Assignee: Korea Institute of Geoscience and Mineral Resources (KIGAM)
    Inventors: Ki-Sung Sung, Jeong-Chan Kim, Kue-Young Kim, Tae-Hee Kim
  • Patent number: 8326555
    Abstract: A system and related method are provided for measuring conductivity/resistivity of water having high purity, including a temperature sensor and a conductivity/resistivity sensor exposed to a water source. The system further includes a computing assembly configured to receive measurement signals from the sensors and to determine change in resistivity over a change in temperature (a collected R/T slope) from the collected temperature measurements and the collected resistivity measurements. The system compares the collected R/T slope to a standardized R/T slope at a temperature value corresponding to a midpoint temperature of the temperature measurements over the prescribed time interval. Based on the comparing, the system provides providing a compensated measurement for resistivity or conductivity of the water source. As a result, the system can calibrate the sensor continually during use, in real time, resulting in highly improved accuracy.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: December 4, 2012
    Assignee: Georg Fischer Signet LLC
    Inventor: John W. Morgan
  • Patent number: 8318525
    Abstract: A device for sensing a gas comprises a plastics housing (106, 107) moulded in situ around at least one portion of a conducting lead frame (100), the housing defining an enclosure (113) and being provided with means for enabling gas flow into the enclosure. A gas sensitive element (114) within the enclosure (113) is mounted to the conducting lead frame (100). The conducting lead frame (100) comprises connection leads which are accessible through, and at least partially encapsulated by, the wall of the housing.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: November 27, 2012
    Assignee: City Technology Limited
    Inventors: David Frank Davies, Ian Paul Andrews, Anthony Richard Cowburn, Stuart Christopher Cutler
  • Patent number: 8302459
    Abstract: The measurement sensitivity is improved by suppressing the surrounding temperature influence as much as possible, while realizing scale reduction, and by enlarging the detection signal, while reducing the production errors in enclosing a reference gas. Provided is a thermal conductivity sensor that detects thermal conductivity of a sample gas by using a Wheatstone Bridge circuit constructed in such a manner that measurement resistors that are brought into contact with the sample gas are disposed on a first side, and reference resistors that are brought into contact with a reference gas are disposed on a second side, and comparing the potential difference between connection points of the reference resistors and the measurement resistors. The measurement resistors disposed on the first side are assembled in one measurement space, and the reference resistors disposed on the second side are assembled in one reference space.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: November 6, 2012
    Assignee: HORIBA, Ltd.
    Inventors: Makoto Matsuhama, Tomoko Seko, Shuji Takada, Hiroshi Mizutani, Takuji Oida, Masahiko Endo, Takuya Ido
  • Publication number: 20120222556
    Abstract: A system and process for the recovery of at least one halogenated hydrocarbon from a gas stream. The recovery includes adsorption by exposing the gas stream to an adsorbent with a lattice structure having pore diameters with an average pore opening of between about 5 and about 50 angstroms. The adsorbent is then regenerated by exposing the adsorbent to a purge gas under conditions which efficiently desorb the at least one adsorbed halogenated hydrocarbon from the adsorbent. The at least one halogenated hydrocarbon (and impurities or reaction products) can be condensed from the purge gas and subjected to fractional distillation to provide a recovered halogenated hydrocarbon.
    Type: Application
    Filed: August 31, 2010
    Publication date: September 6, 2012
    Applicant: Blue-Zone Technologies Ltd.
    Inventors: Dusanka Filipovic, Laurence Whitby, Biljna Milin, Frederick Cashin
  • Publication number: 20120204623
    Abstract: A gas detector for use in, for example, measuring the concentration of flammable gas or detecting leakage of flammable gas. The gas detector has a gas detection element in which at least a heat-generating resistor and an insulation layer are laminated on a semiconductor substrate made of silicon while the insulation layer encloses the heat-generating resistor. The gas detector detects flammable gas on the basis of temperature and resistance of the heat-generating resistor which vary according to flammable gas. In the gas detection element, a protection layer in the form of a gas impermeable oxide film is provided on its outermost surface which comes into contact with an environmental atmosphere that contains flammable gas. Thus, alkali resistance is ensured. Since the protection layer is impermeable to gas, entry of impurities (organic silicon) contained in the environmental atmosphere into the protection layer is restrained, whereby output is stabilized and becomes accurate.
    Type: Application
    Filed: February 11, 2011
    Publication date: August 16, 2012
    Inventors: Toshihiro Matsuno, Masaya Watanabe, Shoji Kitanoya
  • Patent number: 8161795
    Abstract: A physical gas sensor of thermal type capable of determining the concentrations of a gas mixture even in the presence of humidity by measuring the thermal diffusivity and conductivity includes a cell with thermal conductivity whose frequency response to the gases is known, in particular in respect of humidity, delivering a signal Vm representative of the concentration of the gas. This cell is excited by a pulsed signal so that a processing can be carried out at different analysis frequencies: at low frequency and at higher frequency. The output signals from the two processing chains are combined in the circuit (60) so as to provide the levels of concentration of the gas and the concentration of the water vapour. The signals obtained may also be re-combined together with components of the signal Vm of various passbands.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: April 24, 2012
    Assignee: Neroxis SA
    Inventors: Yves De Coulon, Olivier Chetelat, Marc Brodard, Emmanuel Onillon
  • Patent number: 8156787
    Abstract: A metal compound (50) able to trap a sulfur component in exhaust gas is arranged in a flow path of the exhaust gas, a property of the metal compound (50) changing along with an increase of the amount of sulfur component trapped at the metal compound (50) is measured, and the cumulative value of the amount of SOX actually contained in the exhaust gas is calculated from the measured property. On the other hand, the assumed cumulative value of the amount of SOX, assumed to be contained in the exhaust gas when assuming that fuel or oil of a sulfur concentration assumed in advance is used, is calculated. It is judged if fuel or oil with a high sulfur concentration is being used from the actual cumulative value of the amount of SOX and the assumed cumulative value of the amount of SOX.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: April 17, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takamitsu Asanuma, Kohei Yoshida, Hiromasa Nishioka, Hiroshi Otsuki, Yuka Nakata
  • Publication number: 20120073357
    Abstract: A method for the determination of gas concentrations xi in a gas mixture using a thermal conductivity detector with a Wheatstone bridge. It comprises the following method steps: measuring the bridge voltage Xa; correcting the measured values for the bridge voltage Xa, in particular with respect to drift; determination of the thermal conductivity of the gas mixture; and determination of at least one gas concentration xi. Preferably, an automatic zero-point correction and an automatic measuring range end value correction occur within the framework of the correction.
    Type: Application
    Filed: September 13, 2011
    Publication date: March 29, 2012
    Applicant: THERMO ELECTRON LED GMBH
    Inventors: Heinz Gatzmanga, Roberto Wolff, Hermann Stahl
  • Publication number: 20120042712
    Abstract: The present invention provides a thermal conductivity detector capable of realizing high detection performance even with the use of a miniaturized heating element, and expanding an effective applicable temperature range of a heating element, and to provide a gas chromatograph using the same. The thermal conductivity detector comprises a flow-path through which a measurement gas is caused to flow, a heating element disposed inside the flow-path, the heating element being formed on the substrate, for detecting thermal conductivity of the measurement gas according to magnitude of an amount of heat taken away from the heating element by the measurement gas, wherein said heating element is provided with a beam including a part where the beam is folded at a predetermined angle, the part being formed at the central part of the beam.
    Type: Application
    Filed: August 17, 2011
    Publication date: February 23, 2012
    Applicant: YOKOGAWA ELECTRIC CORPORATION
    Inventors: Naoki Kishi, Hitoshi Hara, Tetsuya Watanabe, Kentaro Suzuki
  • Patent number: 8117898
    Abstract: A method for sensing gas composition and gas pressure, based on the thermal constants of a variable electrical resistor, is presented. The method for sensing gas composition and pressure includes monitoring a variable electrical resistor whose dynamic thermal response is determined by the thermal conductivity and thermal capacity of the surrounding gas of a given atmospheric environment. In the thermal domain, the sensor has a low-pass characteristic, whose phase delay is determined by the thermodynamic characteristics of the surrounding gas such as composition and pressure. The method can be used for sensing gas composition and can also be used for sensing gas pressure.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: February 21, 2012
    Assignee: Institut National D'Optique
    Inventors: Jean François Viens, Loïc Le Noc
  • Patent number: 8110783
    Abstract: A tubular heater includes a continuous heat-generating resistance element formed in a predetermined pattern on one surface of a tubular insulating substrate, and first and second lead wires connected opposite ends of the heat-generating resistance element and extending from one end of the tubular insulating substrate in a common axial direction of the tubular insulating substrate. The first and second lead wires are disposed in diametrically opposed relation to each other about a central axis of the tubular insulating substrate.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: February 7, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takashi Sasaki, Akihiro Suzuki
  • Publication number: 20120024043
    Abstract: Thermal conductivity detectors and methods of operating thermal conductivity detectors are described herein. One or more device embodiments include a single fluidic channel, wherein the single fluidic channel includes a single inlet and a single outlet, and multiple sensors configured to determine one or more properties associated with a thermal conductivity of a fluid in the single fluidic channel.
    Type: Application
    Filed: July 29, 2010
    Publication date: February 2, 2012
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Adam D. McBrady, Robert Higashi, Karen M. Newstrom-Peitso, Fouad Nusseibeh
  • Patent number: 8055456
    Abstract: An interior space of the at least one housing of a force-measuring device is filled with a gas composition that is distinguishable in at least one parameter from the ambient atmosphere. A sensor that is arranged in the interior space, or on the housing, measures this distinguishable parameter. A processing unit of the force-measuring device compares signals obtained from the sensor to monitor and determine the condition of the force-measuring device.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: November 8, 2011
    Assignee: Mettler-Toledo AG
    Inventors: Urs Loher, Kurt Jensen, Volker Ziebart
  • Patent number: 8024958
    Abstract: A gas sensor includes a substrate having a low thermal conductivity. Localized heating can be produced using a serpentined heater carried by the substrate. The low thermal conductivity of the substrate substantially confines the generated heat to a region local to the heater thereby reducing required power to operate the sensor. Multiple sensing elements can be deposited onto the substrate adjacent to respective heaters and relatively close together because of the thermal isolation provided by the substrate. In one embodiment, the sensor can include the ceramic substrate, the heater, catalytic material overlying the heater with a gas impermeable layer overlying, at least in part the catalytic material.
    Type: Grant
    Filed: May 8, 2008
    Date of Patent: September 27, 2011
    Assignee: Life Safety Distribution AG
    Inventor: Keith F. E. Pratt
  • Publication number: 20110185789
    Abstract: A calorific value calculation formula generating system is equipped with a measuring mechanism for measuring heat dissipation constant values or thermal conductivity values of each of plural mixed gases each containing plural kinds of gas components at plural temperatures; and a formula generation module for generating a calorific value calculation formula having heat dissipation constant or thermal conductivities at the plural temperatures as independent variables and a calorific value as a dependent variable on the basis of calorific value values of the plural mixed gases and the heat dissipation constant values or the thermal conductivity values measured at the plural temperatures.
    Type: Application
    Filed: October 1, 2008
    Publication date: August 4, 2011
    Applicant: YAMATAKE CORPORATION
    Inventors: Yasuharu Ooishi, Yasue Hayashi, Hiroyuki Muto, Shigeru Aoshima, Shuji Morio
  • Publication number: 20110154885
    Abstract: The present invention provides a high-responsiveness and high-accuracy thermal gas sensor configured to enable gas to be analyzed based on a variation in heat conductivity. The thermal gas sensor includes a substrate 2 with a cavity portion 5, a thin-film support 6 stacked in the cavity portion and comprising a plurality of insulating layers 8a and 8b, and a first heating member 3 and a second heating member 4 both sandwiched between the insulating layers in the thin-film support. The second heating member is located around a periphery of the first heating member. The first heating member is controlled to a temperature higher than a temperature to which the second heating member is controlled. The concentration of ambient gas is measured based on power applied to the first heating member.
    Type: Application
    Filed: December 20, 2010
    Publication date: June 30, 2011
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: HIROSHI NAKANO, MASAMICHI YAMADA, MASAHIRO MATSUMOTO, KEIJI HANZAWA
  • Publication number: 20110107816
    Abstract: A thermal conductivity detector includes a structure defining a cavity, the structure principally comprising a material having a first coefficient of thermal expansion; a sensing element for sensing a thermal conductivity of a gas flowing within the cavity, the sensing element having a second coefficient of thermal expansion different from the third first coefficient of thermal expansion, the sensing element being disposed at least in part within the cavity; and a compensation structure having a third coefficient of thermal expansion different from the first and second thermal coefficients of expansion. Over a selected temperature range, a stress within the sensing element is less than a yield stress of any component of the sensing element, and a stress within the compensation structure is less than a yield stress of any component of the compensation structure.
    Type: Application
    Filed: November 6, 2009
    Publication date: May 12, 2011
    Applicant: AGILENT TECHNOLOGIES, INC.
    Inventor: Phillip W. BARTH
  • Publication number: 20110107817
    Abstract: A particle sensor including a diaphragm, a diaphragm heater, and at least two measuring electrodes situated on the diaphragm, for electrical conductivity measurement, the diaphragm having a thickness of less than or equal to 50 ?m, in order to allow a calorimetric particle quantity determination.
    Type: Application
    Filed: November 8, 2010
    Publication date: May 12, 2011
    Inventors: Andreas Krauss, Tino Fuchs
  • Patent number: 7926323
    Abstract: A heat radiation coefficient C [=Ph/(Th?To)] from a microheater is calculated in accordance with a power Ph applied to the microheater which is supported in air and provided in an ambient gas, a heater temperature Th, and an ambient temperature To at this moment. Further, a thermal conductivity ?(T) of the ambient gas is obtained from the calculated heat radiation coefficient C based on a proportional relation [C=K·?(T)] between a thermal conductivity ?(T) of the ambient gas and the heat radiation coefficient C at a measurement temperature T [=(Th?To)/2].
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: April 19, 2011
    Assignee: Yamatake Corporation
    Inventors: Yasuharu Ooishi, Shigeru Aoshima, Nobuyoshi Shingyouji, Yasue Hayashi, Shuji Morio
  • Publication number: 20110079074
    Abstract: A method for detecting a ratio of a first substance to that of a second substance in a mixture of substances, includes generating heat in a heating element; measuring a temperature proximate to the heating element; and calculating the ratio of the first substance to that of the second substance from the temperature. In some embodiments, the ratio of the concentrations of hydrogen and chlorine in a mixture of hydrogen and chlorine may be determined.
    Type: Application
    Filed: May 28, 2010
    Publication date: April 7, 2011
    Inventor: Saroj Kumar Sahu
  • Patent number: 7900374
    Abstract: An automatic drying apparatus and a method of controlling the same is disclosed, enabling exact drying by using a humidity sensor (37) provided at a location having a stabilized output characteristic for automatic drying, the automatic drying apparatus including a heating apparatus (31) for heating air supplied into a drum into which a drying object is introduced, a fan (32) for forcibly drawing air into the drum; and a humidity sensor (37) provided between the fan (32) and the heating apparatus (37) such that a sensing surface is positioned to be parallel to a flowing direction of air passed through the fan (32), for outputting a sensing voltage value for determining dryness of the drying object.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: March 8, 2011
    Assignee: LG Electronics Inc.
    Inventors: Sun Cheol Bae, Dae Woong Kim, Chang Woo Son
  • Publication number: 20100294021
    Abstract: A fluid identification device of long life for identification of a target fluid. The device uses at least two liquid type detection parts each of which is equipped with both of a temperature detector and a heating element, selects electrical conduction to any one of the heating elements, and identifies the target fluid based on a fluid temperature detection signal of the temperature detector in the fluid detection part not including the heating element whose electrical conduction has been selected and an output of the fluid type detection circuit.
    Type: Application
    Filed: February 13, 2007
    Publication date: November 25, 2010
    Applicant: MITSUI MINING & SMELTING CO., LTD.
    Inventors: Tsutomu Makino, Atsushi Koike
  • Publication number: 20100242573
    Abstract: The measurement sensitivity is improved by suppressing the surrounding temperature influence as much as possible, while realizing scale reduction, and by enlarging the detection signal, while reducing the production errors in enclosing a reference gas. Provided is a thermal conductivity sensor that detects thermal conductivity of a sample gas by using a Wheatstone Bridge circuit constructed in such a manner that measurement resistors that are brought into contact with the sample gas are disposed on a first side, and reference resistors that are brought into contact with a reference gas are disposed on a second side, and comparing the potential difference between connection points of the reference resistors and the measurement resistors. The measurement resistors disposed on the first side are assembled in one measurement space, and the reference resistors disposed on the second side are assembled in one reference space.
    Type: Application
    Filed: March 18, 2010
    Publication date: September 30, 2010
    Applicant: HORIBA LTD.
    Inventors: Makoto Matsuhama, Tomoko Seko, Shuji Takada, Hiroshi Mizutani, Takuji Oida, Masahiko Endo, Takuya Ido