Matches 1 - 50 out of 113 1 2 3 >


Match Document Document Title
8935959 Thermal type flow rate sensor  
To reduce a signal variation of a bridge circuit connected with a temperature sensing resistor that is caused by a strain even when the strain is generated at a diaphragm portion of a substrate...
8413503 Constant temperature anemometer  
A constant temperature anemometer is disclosed. The anemometer includes electrically conductive pins including a first set of pins and a second set of pins. A conductor is coupled to the...
8197762 Method of dispensing a volatile material  
A method of dispensing a volatile material comprises the steps of providing power to a volatile material diffuser having a diffusion element. The method further includes the step of operating the...
7946167 Constant temperature hot-conductor anemometer  
A constant temperature hot-conductor anemometer includes a set of electrically conductive pins including a pair of inner pins and a pair of outer pins. A conductor is electrically and mechanically...
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...
7653503 Temperature-compensating sensor system  
A temperature compensating fluid flow sensing system is provided that comprises a resistance-based sensor element that is included in a constant voltage anemometer circuit configured to establish...
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...
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...
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...
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...
6983214 Flow rate measuring method and flow-meter  
A flowmeter including a flow rate detection circuit including a thermal flow rate sensor (10) disposed in a measurement flow passage through which fluid to be measured passes, a temperature sensor...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
5522261 Fluid flow direction and velocity monitor and temperature compensating circuit therefor  
A fluid flow direction and velocity monitor, particularly useful in monitoring pressure differentials between a controlled environment and its surroundings, includes a heated thermal sensor...
5515714 Vapor composition and flow sensor  
The present invention is directed to a single solid state thermal diffusion sensor capable of measuring both the composition and flow of gaseous vapors traveling through a duct. The sensor...
5493100 Thermistor flow sensor and related method  
A fluid flow rate measuring apparatus having a thermistor exposed to a flow of fluid and a driver circuit operable in an initial constant-voltage mode, in which it applies a substantially constant...
5467650 Open channel flowmeter  
A flowmeter for measuring the volumetric discharge in an open channel makes two measurements: (1) velocity at a fixed point, and (2) fluid level. A level-discharge function which is a function of...
5460039 Flow sensor system  
A system for measuring the flow rate of gas includes a flow head having a sensor thermoresistor mounted transversely to the flow of gas, and a reference thermoresistor mounted parallel to the flow...
5435180 Method and system for measuring air flow rate  
An air flow measuring system has a unit for measuring an air flow rate and outputting an air flow rate indicative signal, a unit for measuring an air temperature for outputting an air temperature...
5419187 Air flow rate meter and detection method  
An air flow rate meter for detecting an air flow rate in a wide operating temperature range. A heating temperature of a heat generating resistor for detecting an intake air flow rate is set on the...
5361634 Heat-sensitive flow rate sensor  
A heat-sensitive flow rate sensor employs a measuring resistor unit which has a heat-sensitive resistor. The resistance value of the heat-sensitive resistor progressively decreases towards a...
5349851 Active thermal isolation for temperature responsive sensors  
A temperature responsive sensor is located in the airflow over the specified surface of a body and is maintained at a constant temperature. An active thermal isolator is located between this...
5347861 Thermal mass flow meter  
The portions on the sides far to each other of two sensor coils wound around the outer circumferential portion of the conduit, through which the fluid passes, at the suitable interval are...
5343745 Apparatus and method for detecting intake air quantity for internal combustion engine  
An apparatus for detecting an intake air quantity for an internal, combustion engine and method therefor are disclosed in which a passed time from a time at which a power supply to a temperature...
5321983 Method of correcting temperature characteristics of flow velocity sensor  
In a method of correcting temperature characteristics of a flow velocity sensor, the flow velocity sensor having a heater and a pair of temperature-measuring sensors arranged on both sides thereof...
5317910 Process for determining a flow rate of a fluid  
A process for determining the flow rate of a fluid, in particular of an air flow of an internal combustion engine, a temperature dependent resistor through which a heating current flows being...
5272915 Airflow sensing system  
Disclosed is an airflow sensing system for determining the type of airflow flowing over a flight surface. A hot film sensor is driven by a constant voltage feedback circuit that maintains the...
5263369 Flow sensor system and method  
A gas flow sensor system, using hot wire flow and temperature sensors, compensates and corrects for various factors, such as water vapor content and gas composition in the measured gas, gas...
5237867 Thin-film air flow sensor using temperature-biasing resistive element  
Two discrete self-heating elements are provided in a silicon based sensor structure. The first, "transfer" self-heating element receives constant current and elevates the temperature of the sensor...
5237523 Flowmeter fluid composition and temperature correction  
A method for correcting the flow measurement of a gaseous or liquid fluid of interest for changes in the composition and temperature of that fluid in a flowmeter of the hot element type is...
5233868 Non-intrusive mass flow measuring apparatus and method  
A non-intrusive mass flow measuring apparatus includes a sensor unit and a processor unit. The sensor unit includes a sensor conduit, a heating element, and three separate temperature sensor...
5226319 Hot wire air flow meter  
A hot wire air flow meter for producing a pulse output includes the combination of a hot wire element, for detecting air flow, a cold wire element, for detecting air temperature and an electronic...
5222395 Thermal type flowmeter  
A heat-conductive stream pipe has an upstream side and a downstream side temperature-sensing element having resistance wires wound round the pipe at a certain distance there-between to assure that...
5211056 Thermal type intake air flow measuring instrument  
Analog circuit of a thermal type intake air flow sensor for detecting a quantity of air drawn into an automotive engine is formed as a part of the input hardware of a microcomputer for control of...

Matches 1 - 50 out of 113 1 2 3 >