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8959994 Thermal sensor with temperature control  
In a thermal sensor. a capacitor voltage of a capacitor is compared with a reference voltage, and an output voltage is generated based on the comparison. The output voltage has a pulse density...
8911380 Respiration monitoring system and method  
A respiration monitoring system includes a thermoelectric generator that may be mounted within a mask enclosure or free-standing, covering all or part of the nose and/or mouth of a subject. A...
7755499 Detecting apparatus for detecting operation of fan  
A detecting apparatus for detecting operation of a fan, includes a first current module disposed at an airflow path of the fan, a second current module insulated from the airflow, and an...
7681306 Method of forming an assembly to house one or more micro components  
Formation of a structure with through-holes includes attaching two sub-structures to one another. The resulting structure may be used in a sub-assembly for various types of micro components and...
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...
7600422 Electronic components packaging structure  
In a preferred embodiment, a thermal mass flow meter is provided with: a pipe arrangement that allows a fluid to flow therein, a chip-type heat-generating element that is anchored on the surface...
7430903 Fluid flow measurement using optical fibres  
A method of monitoring fluid flow uses an optical fiber having a heatable coating. The fiber is disposed within flowing fluid, and the heatable coating heated so that heat is transferred from the...
7418859 Device for measuring a volume flow with inductive coupling  
A device for measuring a volume flow, especially a tidal volume flow sensor, with a flow channel (1) and with a sensor element (6) arranged within the flow channel (1), is shown and described. The...
7051418 Method of measuring weak gas flows  
Firstly, a supporting frame is produced, whose opening is spanned by an auxiliary layer flush on one side. Following the production of microstructures, flat parts or membranes on the common plane...
7040159 Air meter  
An air meter is provided which enables the improvement of accuracy of internal reference voltages with few IC terminals. A band gap reference power supply circuit 6 supplies an internal reference...
6892571 Sensor for the measurement of flowspeeds and method for operating the same  
A sensor for measuring a flow speed of a fluid medium includes a housing with a carrier membrane disposed in the housing and being essentially in a form of a vane having a circumference and at...
6854325 Sensor chip having potential surfaces for avoiding contaminant  
A sensor chip having at least upstream from the sensor region, at least one potential surface that, by electrical interaction with the contaminants in the flowing medium, prevents precipitation in...
6845660 Sensor chip with additional heating element, method for preventing a sensor chip from being soiled, and use of an additional heating element on a sensor chip  
A sensor chip exposed to a flowing medium is provided with an additional heater situated upstream and at a definite distance from the sensor area, resulting in the impurities in the flowing medium...
6575027 Mass flow sensor interface circuit  
An improved mass flow sensor interface (“MFSI”) circuit and method are disclosed for sensing and measuring mass flow rate of a gas and provide an output voltage proportional to the mass flow rate...
6568263 Liquid level detector and system  
A system for detecting the level of fluid in a fluid containing vessel. The system includes a device for applying energy to a selected location on the vessel. A sensor in proximity to the location...
6357293 Air flow meter with heat generating resistor  
In a ratiometric output type air flow meter with a heat generating resistor, a ratiometric circuit is provided with a divider circuit which is constituted by invariable resistors and divides an...
6208254 Thermal dispersion mass flow rate and liquid level switch/transmitter  
A thermal dispersion switch/transmitter for determining flow rate and liquid level in a non-contacting apparatus. A special preparation of one or more small spots in the outside surface of the...
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...
5936156 Liquid metering  
A meter to measure the volumetric flow rate of a liquid, for example water, is formed with a pipe forming a liquid flow path containing a low power electrical heater. A first temperature sensor...
5861556 Flowmeter  
A plurality of flow velocity sensors are vertically installed in line at different positions in the same cross section in a gas flow passage in a pipe. Detection signals from the flow velocity...
5827960 Bi-directional mass air flow sensor having mutually-heated sensor elements  
A low cost, bi-directional manifold air flow sensing device based on sensed temperature differential due to airflow achieves improved sensitivity and frequency response by eliminating the heater...
5824895 Air flow meter of a heating resistor type  
A heating resistor type air flow meter for measuring the amount of air flow which passes through an intake pipe for an internal combustion engine. The air flow meter has a constant-temperature...
5764539 Non-invasive system and method for a fluid flow monitoring system  
A non-invasive system and method is provided for a fluid delivery system of the type including a fluid delivery pump delivering fluid in pulses through a fluid delivery tube. The non-invasive...
5677484 Device for measuring the flow in a fluid channel  
A device for measuring the flow of a fluid in a fluid channel, with at least one thermocouple, whose thermojunctions are arranged one behind the other in the direction of flow of the fluid and are...
5537871 Hot wire type air flowmeter  
A hot wire type air flowmeter has a drive circuit for controlling the temperature of a hot wire type resistor and for outputting indications of controlling states as electric signals, an output...
5199300 Device for controlling resistor temperature  
A device for controlling the temperature of a resistor used for measuring purposes is adversely affected in its measuring accuracy as the result of deposits on the resistor (8). To establish the...
5177696 Method of determination of gas properties at reference conditions  
A method of determination of gas properties at reference conditions of temperature and pressure. This determination is needed in systems including mass flow meters, combustion control systems, gas...
5119674 Flowmeter  
A flowmeter comprising a thermocouple with hot and cold junctions and a current source for causing a termperature difference between the hot and cold junctions of the thermocouple. The...
5117691 Heated element velocimeter  
The present invention is a heated element sensor for detecting the flow rate of a fluid or other physical characteristics of a fluid. The invention teaches driving the thermo-resistive element...
5111692 Temperature compensated liquid level and fluid flow sensor  
A temperature compensated, self-heating, resistance thermal detector in a sensor circuit for determining fluid level or fluid flow. A resistor in shunt with the detector provides the temperature...
5080106 Apparatus for measuring cardiac output  
An apparatus for measuring cardiac output designed to prevent measurement errors by eliminating the need for a manufacture step of examining a temperature sensing element during manufacture of the...
4944035 Measurement of thermal conductivity and specific heat  
A method and apparatus for determining both the thermal conductivity, k, and specific heat, cp, of a fluid of interest are disclosed. An embodiment uses proximately positioned resistive heater and...
4888987 High sensitivity measurement device for measuring various parameters of non-electric quantity  
A sensing element is constituted by a single or plurality of p-n junctions alternating between the foward and reverse states. A pulse circuit applies different magnitudes of foward and reverse...
4850219 Method and apparatus for measuring the quantity of intake air based on the temperature variation caused by heat dissipation  
A method and apparatus for measuring the quantity of intake air of an internal combustion engine in its suction stroke include the operating steps of: heating a thermal resistor element located in...
4848147 Thermal transient anemometer  
A thermal transient anemometer having a thermocouple probe which is utilized to measure the change in temperature over a period of time to provide a measure of fluid flow velocity. The...
4821568 Method and apparatus for determining a measurable variable  
A method for determining a measurable variable of a flowing medium, in particular the flow velocity and/or the material properties, in which the temperature variation of a heated sensor is...
4787251 Directional low differential pressure transducer  
A pressure differential measuring apparatus (25) wherein the direction of fluid flow (5) is determined by calculating the ratio between pressures of two discrete fluid masses (3, 4). The device...
4581930 Average mass flow rate meter using self-heated thermistors  
A thermal type flow meter for measuring the mass flow rate of a fluid medium especially that of a gas in a duct, said meter comprising a plurality of thermistors operated electrically in the...
4565091 Apparatus for measuring the quantity of airflow passing through an intake passage of an engine  
Disposed in an intake pipe of an engine is a temperature-sensitive element formed of a resistance element whose resistance value varies with temperature. A heating current is supplied to the...
4501145 Immersion thermal exchange parameter determination  
This process consists in raising the temperature of a probe immersed in the fluid to a temperature threshold corresponding to an electric resistance (R1), in measuring at least a second...
4476720 Unidirectional fluidflow sensor system  
A unidirectional fluidflow sensor system including: a sensing chamber for placement in a fluidflow to be monitored; the chamber including input port means facing toward the fluidflow and smaller,...
4462251 Control device in connection with an air flow rate meter of an internal combustion engine  
A control device is proposed for the burnoff procedure of a hot wire in a constant-temperature anemometer. The control device ascertains temperature increases elapsing in an uncontrolled manner at...
4413514 Air flow sensor  
A velocity sensor enclosed within a venturi housing is disposed in a moving fluid stream. A self-heated, negative coefficient thermistor is supported in the interior of the housing to sense...
4334186 Apparatus for driving hot-wire type flow sensor  
An apparatus for driving a hot-wire air-flow sensor of constant temperature difference type includes a hot wire and a temperature sensitive compensating element such as a resistor for compensating...
4322970 Method and apparatus for controlling start-up of airflow measuring systems in automotive vehicles  
To effect reliable start-up of electronic systems in which a comparator compares a measured value with a reference, particularly in which a comparator senses current flow through a temperature...
4059982 Apparatus for the measurement of thermal properties of biomaterials  
Appropriate heating and temperature sensing means are immersed in a medium the thermal conductivity, k, and thermal diffusivity, α, of which are to be determined both in the presence of and in the...
3905230 Device for measurement by active sensor  
The device comprises a thermoresistance sensor for immersion in the medium o be studied; a generator for delivering to the sensor a first electrical pulse and, at the end of a predetermined time...
3859852 FLUID FLOW MEASURING DEVICE  
A method and apparatus for measuring the volume rate of gaseous fluid flow in a given cross-section of a duct. In measuring the flow in a duct, a varistor is connected with an electrical power...
3803913 APPARATUS FOR DETERMINING HEAT-TRANSFER RATES AND THUS THE FLOW RATES OR THERMAL CONDUCTIVITIES OF FLUIDS  
A thermistor bridge circuit and method in which a sensing thermistor generates a square wave having a varying duty cycle, such wave providing an accurate indication of the rate of heat transfer...
3719083 FLOWMETERS  
A flowmeter comprises an electrically resistive sensing element which is heated electrically while exposed to a stream of fluid. The heating power is supplied in the form of a train of identical...

Matches 1 - 50 out of 55 1 2 >