Matches 1 - 50 out of 58 1 2 >
Match Document Document Title
6658931 Fluid flow sensing and control method and apparatus  
A gas mass flow sensor or probe ( 35, 37, 39 ) of an air flow sensing and control system ( 17, 19, 21 ) based upon hot-wire type devices where flow sensing is achieved by controlling the difference...
6553828 Cooled dual element thermocouple computer and flow velocity measurement method  
Embodiments of a flowmeter and velocity measurement method are described, which include preferably a dual element thermocouple that is immersed in a flowing fluid and a computer that processes,...
6318168 Thermal dispersion probe with microcomputer controller  
Thermal dispersion probes used as flowrate sensors in process control of a medium heated by a heater. The device includes a reference temperature sensor for producing an electrical signal...
5682899 Apparatus and method for continuous cardiac output monitoring  
A fluid volume flow monitoring apparatus, fluid volume flow monitoring system and process of monitoring fluid volume flow are disclosed. The fluid volume flow monitoring apparatus includes a...
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...
5515295 Methods and systems for fluid identification and flow rate determination  
Methods and systems for determining the identity and flow rate of a fluid are provided. Linearized output signals are provided. To determine fluid flow, a test fluid is passed through a conduit. A...
5461910 Fluid flow direction and velocity monitor  
A fluid flow detection monitor (80), particularly useful in monitoring pressure differentials between a controlled environment and its surroundings, includes a heat source (1) situated between an...
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...
5383357 Mass air flow sensor device  
A mass air flow sensor device for determining the mass of air flowing therethrough is operatively associated with an engine control module of an internal combustion engine which uses data...
5369994 Flow sensor  
The invention is directed to a flow sensor having a heater, two temperature measuring sensors, a heater temperature sensor and a medium temperature sensor. A control circuit is provided which...
5216743 Thermo-plastic heat exchanger  
The present invention provides a flow-through instantaneous fluid heater system designed to satisfy the need for a heater not limited by being connected to a storage tank and which can be made...
5208650 Thermal dilation fiber optical flow sensor  
A thermal dilation type optical flow sensor includes an optical heating sce for heating a flowing fluid and a sensor disposed in a downstream direction from said heating source wherein the sensor...
5207227 Multiprobes with thermal diffusion flow monitor  
A single probe with thermal diffusion flow monitor (hereinafter known as "SPTDFM") that has improved reliability, smaller overall size, simpler method of sensor positioning, better compatibility...
5193388 Method and apparatus for determining the flow rate of a flowing fluid mass  
A method and apparatus controls the temperature of a precision resistor and, in turn, measures the flow rate of a flowing fluid mass. The precision resistor is a hot wire or hot film of an air mass...
5184509 Method and apparatus for measuring the air flow in the air intake passage of an internal combustion engine  
A method and a circuit arrangement for measuring the air flow in the air intake passage of an internal combustion engine provide an output pulse signal which can be easily processed in digital...
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...
5150611 Flow sensor  
An apparatus for measuring the mass flow rate of air has a resistance bridge circuit, whose diagonal voltage is applied to a switching control element, which is in turn supplied with voltage pulses...
5048332 Flow meter for measuring fluid flow with multiple temperature sensors  
A part of a tube, through which a fluid passes, is cooled by means of an electronic cooling element and a flow rate of the fluid is measured on the basis of a temperature of a surface of the tube...
4947889 Method of measuring flow rate and flow meter for use in said method as well as apparatus for controlling flow rate of liquid using said flow meter  
A part of a tube, through which a fluid passes, is cooled by means of an electronic cooling element and a flow rate of the fluid is measured on the basis of a temperature of a surface of the tube...
4944035 Measurement of thermal conductivity and specific heat  
A method and apparatus for determining both the thermal conductivity, k, and specific heat, c p , of a fluid of interest are disclosed. An embodiment uses proximately positioned resistive heater...
4914742 Thin film orthogonal microsensor for air flow and method  
A microbridge air flow sensor which has a sealed etched cavity beneath the silicon nitride diaphragm so that the cavity is not susceptible to contamination from residual films or other material...
4884443 Control and detection circuitry for mass airflow sensors  
A mass airflow sensor is disclosed which uses a small, thin dielectric diaphragm providing good thermal isolation for thin-film heating and temperature sensing elements, resulting in high flow...
4881407 Hot wire air flow meter  
The bobbin (21) of the heating resistor (1) is made by zirconia or glass fiber. On the surface of the bobbin, a platinum film (31) or a platinum wire (23) are formed. At both ends of the heating...
4843881 Fluid flow sensor system  
A mass flow sensing system in which two heating/sensing coils are disposed about a conduit through which the fluid passes, the coils being located up and down stream along the conduit and close...
4833912 Flow measuring apparatus  
A flow measuring apparatus includes a resistance layer for detecting a flow rate within a passage and an additional resistance layer for burning off deposits formed by suspended particles the like,...
4831876 Measurement probe  
In a measurement probe for measuring the mass of a flowing fluid, particularly the intake air of an internal-combustion engine, having at least one temperature-dependent first resistor which is...
4817427 Device for measuring water flow rate in plant stem  
The disclosed device includes a heater mounted on a plant stem for generating a heat flow Q so as to give a heat supply (Q-Q o ) to water flow in the stem, Q o being heat loss, a means for...
4745805 Process and device for the measurement of the flow of raw sap in the stem of a plant such as a tree  
A process for the measurement of the flow of raw sap in the stem of a tree or other plant, and a device for the embodiment of the process. According to this process, two holes of small diameter are...
4744246 Flow sensor on insulator  
A flow sensor on a thermally insulating substrate is provided with improved thermal conductance and ruggedness to hostile environments. The flow sensor includes a pn junction temperature sensing...
4739657 Resistance with linear temperature coefficient  
The sensors and heater of a microbridge flow sensor are each compensated for non-linear curvature of the resistance versus temperature curve by the use of a section of permalloy in series with a...
4739656 Flow sensing device  
A fluid flow sensing device comprises first and second p-n junctions, one of which is arranged to be disposed in the fluid flow to be measured and the other of which is arranged to be disposed at a...
4712996 Gas burner control system with mass flow sensor  
A gas burner control system for controlling operation of a furnace having a blower fluidically connected to the combustion chamber of the furnace utilizes a mass flow sensor for preventing or...
4693116 Semiconductor-chip gas-flow measuring apparatus  
A gas-flow measuring apparatus including a semiconductor chip and a sensing circuit. The semiconductor chip includes an electric heater and two temperature-detecting elements. One of the...
4688425 Direct-heated flow measuring apparatus having film resistor  
In a direct-heated flow measuring apparatus including an electric heater of a film resistor type and a temperature-detecting resistor for detecting the temperature within a passage, the flow rate...
4688424 Apparatus for measuring air quantity  
An apparatus for measuring the rate of flow of a fluid such as for measuring the quantities of intake air of internal combustion engines. The apparatus includes a first conductive film and a second...
4683858 Apparatus for controlling engine  
In an apparatus for controlling an engine, as an air flow sensor for measuring intake air flow quantity, a heater resistor having temperature-resistance characteristic and a temperature sensitive...
4682496 Flow rate detecting apparatus having semiconductor chips  
A semiconductor type flow rate detecting apparatus having first and second control units arranged at upstream and downstream positions respectively in a flow stream to be measured and an operation...
4571991 Air flow measuring apparatus  
An air flow detecting element is located in the air flow to be measured. This air flow detecting element comprises a heater made of resistant material having a positive temperature coefficient and...
4566320 Fluid flow sensing means with ambient temperature compensation  
A flow sensing or differential pressure sensing device utilizing a pair of bridges is disclosed. A first bridge operates a heating element and a temperature dependent resistor to in turn control an...
4478077 Flow sensor  
A flow sensor comprising a pair of thin film heat sensors and a thin film heater is disclosed. The flow sensor further comprises a semiconductor body with a depression therein and structure...
4468963 Method and apparatus for measuring the mass of a pulsating medium flowing in a flow cross section  
A method and apparatus are proposed for measuring the mass of a pulsating medium flowing in a flow cross section, in particular for measuring the aspirated air mass of internal combustion engines....
4437345 Gas flow measuring device  
A gas flow measuring device has a measuring circuit for measuring the flow of gas based on the output signals of an electric heater and a first and a second temperature dependent resistor. In the...
4417471 Gas flow measuring device  
A first temperature dependent resistor and a second temperature dependent resistor are disposed within a single gas passage defined by a branch pipe extending into a conduit for a gas whose flow...
4409828 Gas flow measuring device  
An electric heater connected between first and second temperature dependent resistors provided inside a pipe through which the gas the flow of which is to be measured is heated for the measurement...
4391132 Gas flow measuring apparatus  
A gas flow measuring apparatus includes first and second temperature dependent resistors located in a gas tube respectively downstream and upstream of an electric heater which is also located in...
4332157 Pyroelectric anemometer  
Disclosed is a pyroelectric anemometer capable of providing an accurate indication of fluid flow rate. A pyroelectric substrate has a heater element located essentially transverse to the fluid flow...
4304129 Gas flow measuring apparatus  
A flow measuring pipe includes therein an electric heater and a temperature dependent resistor positioned downstream of the electric heater. The lines of the electric heater are arranged in a...
4043195 Digital thermodynamic flow-meter  
An apparatus is disclosed for measuring instantaneous rate of flow and total flow of a fluid. The data are obtained by measuring the quantity of energy necessary to replace an equivalent amount of...
4041757 Fluid flowmeter  
Apparatus for measuring the flow of fluid through a main supply line having a restrictive element therein to develop a pressure drop. A shunt fluid flow path bypasses this element. The shunt path...
3975951 Intake-air amount detecting system for an internal combustion engine  
There is provided an intake-air amount detecting system for an internal combustion engine in which a first temperature of an intake air for an internal combustion engine is measured, the intake-air...
Matches 1 - 50 out of 58 1 2 >