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| Number | Title | Issue Date |
| 7654137 | Corrosion-resistant metal made sensor for fluid and a fluid supply device for which the sensor is employed The present invention provides a corrosion-resistant metal made sensor for fluid and a fluid supply device for which the sensor is employed. More specifically, the corrosion-resistant metal made sensor for fluid is equipped with a corrosion-resistant metal su... | 02/02/2010 |
| 7302838 | System and method for closed loop control of boundary layer shear stress A system is provided for controlling boundary layer shear stress adjacent a surface over which a fluid stream has been established. The system comprises a boundary layer control device adapted for altering at least one flow characteristic within a boundary layer in ... | 12/04/2007 |
| 7293454 | Anti-aliasing acoustic filter in the presence of pulsating flow An exhaust flow measurement system uses a noise attenuation device to cancel exhaust gas pulsations at the harmonic frequency of a flow rate measurement transducer. ... | 11/13/2007 |
| 7286925 | Method for pulsation correction within a measuring device measuring a media mass flow A method and a device for the pulsation correction of measured values of a flow device, which is used to measure pulsating gas flows in internal combustion engines. A raw signal of the flow sensor is fed to an adder of a compensation circuit. The raw signal is at th... | 10/23/2007 |
| 7210344 | Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configure... | 05/01/2007 |
| 7201033 | Flowmeter in-situ calibration verification system A calibration system includes a tube or other conduit, a gas source, and a computational device. The tube has an end positioned relative to a flow sensor, and is in communication with the gas source. The tube and gas source introduce calibration gas into the tube at... | 04/10/2007 |
| 7196875 | Permalloy sensor having individual permalloy resist pattern runners with lengths perpendicular to a wafer level anisotropy A permalloy sensor having high sensitivity is presented A substrate and a sensor has a first surface having a wafer level anisotropy in a given direction. A permalloy resistor pattern of individual runners is deposited on the surface such that the mechanical length ... | 03/27/2007 |
| 7191645 | Dynamic mixed gas flowmeter A compensated flowmeter having a probe adapted to project into flowing media within a conduit. The probe includes a thermal dispersion sensor, and a compensating gas properties sensor contained within a no-flow chamber of the probe. The thermal flow sensor has activ... | 03/20/2007 |
| 7140246 | Frequency output type hot-wire flow meter According to the invention, to correct the curvature characteristic in output due to individual differences between frequency output type hot-wire flow meters, a frequency output type hot-wire flow meter includes a heating resistor disposed in the measurement target... | 11/28/2006 |
| 7132838 | Active sensor circuit with one or more T-network pairs A sensor circuit is provided that includes a first T-network including a first impedance serially connected to a second impedance at a first junction and a first variable resistance sensor element connected at a first end to the first junction and at a second end to... | 11/07/2006 |
| 7127366 | Automatic thermal conductivity compensation for fluid flow sensing using chemometrics An automatically compensated fluid flow sensor uses chemometric analysis to produce a compensated fluid flow measurement. A compensation measurement having at least one additional measurement, such as a measurement of thermal conductivity, electrical conductivity, p... | 10/24/2006 |
| 7099767 | Control device for internal combustion engine An intake passage upstream of a throttle valve is divided into a plurality of intake divided-flow conduits, and air flow meters are arranged in the respective intake divided-flow conduits. The throttle opening is obtained, and a throttle valve passing-through air am... | 08/29/2006 |
| 7084378 | Mass-flow sensor heating element protection method and apparatus A heating element protection apparatus for a mass-flow sensor may include a heating element disposed in a gas, a gas temperature sensor disposed in the gas to sense a temperature of the gas, a slope detector to measure a slope of the temperature as power is supplied... | 08/01/2006 |
| 7076359 | Method for producing at least one characteristic line of an air mass detecting device for an internal combustion engine In a method for producing at least one characteristic line of an air mass detecting device for an internal combustion engine precise results can be obtained in the case of a pulsating air flow in a suction region of the internal combustion engine by an air mass dete... | 07/11/2006 |
| 7058532 | Flowmeter A flowmeter for achieving a fluid flow rate value by using calibration curves on the basis of the output of a detection circuit using a bridge circuit (73) containing as constituent resistors respective temperature sensing elements of a flow rate detector con... | 06/06/2006 |
| 7043991 | Damper for a gauge sensor in a dry etch chamber A damper for protecting a gauge sensor measuring the pressure of a dry etch chamber. The damper includes a vacuum tube for connecting the gauge with the chamber and at least one plate for blocking the plasma of the chamber from directly striking against the sensor. ... | 05/16/2006 |
| 7040160 | Flow sensor A flow sensor is described, in particular for analysis of gas flows, having a substrate and at least one sensor component which is sensitive to a flow of a medium, the sensor component being separated from the substrate in at least some areas by a region that is a p... | 05/09/2006 |
| 7036368 | Heating resistor type air flow rate measuring apparatus A heating resistor type air flow rate measuring apparatus is provided with a couple of heating resistors placed at the positions where those resistors may each interfere thermally with respect to an air flow, and a couple of driving circuits for driving those heatin... | 05/02/2006 |
| 7016790 | In-line hot-wire sensor for slurry monitoring An in-line hot-wire sensor for monitoring the mixing and the flow rate of slurry is disclosed. The hot-wire sensor may include a number of resistors organized into a Wheatstone bridge, as well as a frequency-domain transform mechanism. The resistors include a hot-wi... | 03/21/2006 |
| 6999882 | Method for determining a mass airflow In a method for determining a mass airflow in an air duct using a mass airflow sensor, sensor signals at successive times, indicating the magnitude of the mass airflow, are captured and, using a characteristic curve for the mass airflow sensor, corresponding values ... | 02/14/2006 |
| 6915788 | Engine controller To provide a method of processing intake air pressure signals for accurately detecting the engine load including the accelerating state and the intake air flow rate from the intake air pressure. Intake air pressure signals detected with an intake air pressure... | 07/12/2005 |
| 6865937 | Deionized water spray on loss of fluid processing tank exhaust Methods and apparatus are provided for increasing the safety of a clogged or failed exhaust system. In accordance with a first embodiment, an apparatus is provided that includes (1) a tank adapted to contain a processing fluid; (2) an exhaust system coupled to the t... | 03/15/2005 |
| 6820482 | Method and device for determining gas flow A gas flow determination method and a corresponding gas flow determination device. A sensor device including a diaphragm and a frame enclosing it is provided; a predetermined temperature profile is created on the diaphragm; the gas flow to be determined is directed ... | 11/23/2004 |
| 6820480 | Device for measuring gas flow-rate particularly for burners A device for measuring the flow-rate of gas in a duct, particularly for burners. The device includes a gas flow-rate sensor generating a first output signal proportional to the flow-rate detected, a temperature-compensation circuit receiving the first output signal ... | 11/23/2004 |
| 6810345 | Gas flow meter A gas flow meter having a gas flow detection circuit for detecting a current flowing through a resistor installed in a gas passage and a voltage generated across the resistor and outputting a voltage signal representing a gas flow passing through the gas passage; a ... | 10/26/2004 |
| 6756571 | System and method for compensation of contamination of a heated element in a heated element gas flow sensor A system for compensation of contamination of a heated element in a heated element gas flow system in which the heated element becomes heated from an ambient temperature to an elevated temperature upon the application of electrical power to the heated element during... | 06/29/2004 |
| 6732581 | Low thermal capacity device for high precision pocket-size spirometry and other applications The spirometer has a low thermal capacity. A circuit supplies power to the spirometer in pulses to heat the spirometer to body temperature. The circuit senses the temperature of the spirometer between intervals. The circuit can also be used in a calorimeter to measu... | 05/11/2004 |
| 6662121 | Thermal fluid sensor, fluid discriminating apparatus and method, flow sensor, and flow rate measuring apparatus and method When a micro-heater heats fluid using an external driving current, an upstream thermopile 8 detects the temperature of the fluid before it is heated to produce a first temperature detected signal and a downstream thermopile 9 detects the temperature of th... | 12/09/2003 |
| 6520009 | Air flow rate measuring apparatus An air flow rate measuring apparatus generates a flow rate signal with a nonlinear characteristic from a flow rate detecting unit provided with a heat generating resistor and converts that into a signal with a linear characteristic by a linearizing circui... | 02/18/2003 |
| 6470741 | Hot wire anemometer gas flow sensor having improved operation and compensation A hot wire gas flow rate sensor having a bridge circuit with a sensing resistor avoids saturation of the signal processing circuitry at high gas flow rates by increasing a bias signal to a differential amplifier in the signal processing circuitry in a ste... | 10/29/2002 |
| 6386030 | Balanced bridge temperature regulator for an air-mass flow meter A temperature regulator, circuit for an air-mass flow meter in which the temperature regulator circuit includes a bridge circuit one of whose bridge branches contains a temperature resistor of substantially higher resistance than a heating resistor in the... | 05/14/2002 |
| 6272919 | Method for measuring a gas flow rate and a gasmeter therefore Gasmeter for determining a flow rate of gas within a channel is provided. The gasmeter includes a channel for passing through it a flow of gas along a first sensor and a chamber which is arranged for receiving and containing at substantially stand still g... | 08/14/2001 |
| 6205854 | Heat-sensitive type flow sensor A heat-sensitive type flow sensor which can be manufactured by using discrete parts at low cost in a miniature size with high accuracy and reliability includes a correcting circuitry capable of compensating for a detected current indicating a flow rate of... | 03/27/2001 |
| 6019505 | Time lag approach for measuring thermal conductivity and specific heat A method and apparatus for providing a more direct approach to determine the thermal conductivity, thermal diffusivity and specific heat of a fluid of interest, independently of the amplitude of the sensor output. This is preferably accomplished by measur... | 02/01/2000 |
| 5854425 | Method for measurement and compensation of a time constant for a constant voltage anemometer A method for compensating for the time constant (delay time) of hot-wire/hot-film in a constant voltage anemometer is provided. The method is a two-part series of steps, the first series for measuring the time constant in a particular wind tunnel setup an... | 12/29/1998 |
| 5646344 | Device for determining a pulsating air mass flow in an internal combustion engine The device determines the pulsating air mass flow in an internal combustion engine. The device includes a sensor producing an output signal to be evaluated to determine a pulsating air mass flow and a filter device for filtering the output signal to produ... | 07/08/1997 |
| 5641903 | Gas rate sensor for detecting horizontal angular velocity A gas rate sensor comprising a sensor body, a pump control device and a resistive bridge circuit. Semiconductor substrates are accurately photoengraved by semiconductor fabrication techniques to integrally form a pair of heat-generating and heat-sensitive... | 06/24/1997 |
| 5635635 | Method and apparatus for detecting the intake air quantity of an engine The present invention is able to detect the intake air quantity which has been discriminated into flow direction by detecting the engine intake air quantity at two locations separated in the direction of flow of the intake air, comparing the detection val... | 06/03/1997 |
| 5629481 | Mass air flow measurement system and method A mass air flow measurement system comprising a sensing device located in an air flow providing an output signal relational to an mount of mass air flow past the device, wherein the sensing device has an inherent sensor response time constant and acts to ... | 05/13/1997 |
| 5582628 | Unit and system for sensing fluid velocity A thermal anemometer having a large number of thermally isolated fins is placed in a fluid flow. The flow velocity is computed from the temperature of the fin tips and the fluid temperature along with knowledge of the amount of power supplied to the fins.... | 12/10/1996 |
