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| Number | Title | Issue Date |
| 5415029 | Air flow detector for engine control unit An exothermic resistor type air flow detector according to the invention is compact and requires no special radiation structure. A control circuit comprised of a transistor T and a differential amplifier are formed with an exothermal resistor Rh on an ins... | 05/16/1995 |
| 5383356 | Mass air flow sensor arrangement having increased dynamic range A mass air flow sensor arrangement that has a mass air flow sensor fixedly mounted on a sensor mount which is connected to the low pressure region of a downstream venturi. The sensor mount has an isolation air flow conduit in which is received the sensing... | 01/24/1995 |
| 5324111 | Steam flow meter A steam flow meter provided with a steam flow rate detecting device and a steam pressure and temperature detecting device. In order to accurately maintain the heating temperature of the material to be heated without provision of any further measuring devi... | 06/28/1994 |
| 5299455 | Method and instrumentation system for measuring airspeed and flow angle An instrumentation system for measuring airspeed and angle-of-attack (AOA) is provided. The system includes a sensor assembly, a constant voltage anemometer, a microprocessor assembly with software, and an output device suitable for powering conventional ... | 04/05/1994 |
| 5301126 | Method of processing a signal from a thermal type flow sensor A method of processing signal for a thermal type flow sensor having a temperature dependence resistance employing platinum and the like and a holding member made of alumina for holding it so as to compensate for response delay when fluid flow is changed, ... | 04/05/1994 |
| 5291781 | Diaphragm-type sensor A diaphragm-type sensor is disclosed which comprises a substrate including a cavity, a diaphragm formed on the cavity and supported by the substrate, a heater element arranged on the diaphragm, two sensor elements arranged on both sides of the heater mean... | 03/08/1994 |
| 5230245 | Flow meter and measuring method therefor A flow meter is provided which employs a thermal flow sensor and a correcting flow meter, for example, a Karman vortex flow meter such that the output from the thermal flow sensor is corrected by the Karman vortex flow meter, thereby making it possible to... | 07/27/1993 |
| 5218863 | Instrumentation system for determining flow stagnation points A method and portable microcomputer-based system for determining flow field stagnation points are disclosed. The apparatus uses hot film sensors wrapped around the leading edge of an airfoil to measure boundary layer oscillations. A plurality of sensor si... | 06/15/1993 |
| 5209111 | Method of measuring cross-flow vortices by use of an array of hot-film sensors The invention is a method for measuring the wavelength of cross-flow vortices of air flow having streamlines of flow traveling across a swept airfoil. The method comprises providing a plurality of hot-film sensors. Each hot-film sensor provides a signal w... | 05/11/1993 |
| 5108193 | Thermal flow sensor A thermal flow sensor comprising a substrate which can be etched, an electrical insulating film which is formed on said substrate and which has an etching characteristic different from that of said substrate, a heating resistor which is disposed on said i... | 04/28/1992 |
| 5085073 | Thermal remote anemometer system A sample in a wind tunnel is radiated from a thermal energy source exteriorly of the wind tunnel. A thermal imager system, also located exteriorly of the wind tunnel, reads surface radiations from the sample as a function of time. The produced thermal ima... | 02/04/1992 |
| 5064296 | Integrated semiconductor circuit for thermal measurements Integrated semiconductor circuit for thermal measurements, comprising at least a thermal signal comparator (8), the comparator (8) being provided with a signal feedback loop containing a DA signal converter (3), more specifically, the comparator (8) being... | 11/12/1991 |
| 4969357 | Compensated thermal flux mass flowmeter A mass flowmeter for measuring the velocity of a fluid uses an active and a compensating sensor. The sensors generate heat when supplied with electrical power. A first heat sink is located a first gap from the first sensor in a direction substantially per... | 11/13/1990 |
| 4932255 | Flow sensing using surface acoustic waves A sensor employs a SAW oscillator heated above the ambient by converting RF energy to heat via acoustic dissipation in energy absorbers located outside the path of propagation. The oscillator utilizes a delay line designed to support single mode operation... | 06/12/1990 |
| 4918995 | Electronic gas meter An electronic compact gas meter includes a solid state flow sensor for sensing gas flow rate, data acquisition circuits including an analog-to-digital converter coupled to the sensor for controlling same and providing an output indicative of gas flow, and... | 04/24/1990 |
| 4911009 | Thermal air flow meter A thermal air flow meter for measuring the flow rate of intake air supplied to an internal combustion engine comprises a thermal sensor disposed in an intake air passage, a drive circuit including a circuit pattern formed on a circuit board for driving th... | 03/27/1990 |
| 4876887 | Thermal flux mass flowmeter A mass flowmeter for measuring velocity of a flowing fluid employs a thermal sensor. The sensor generates heat when supplied with electrical power. A heat sink is located in the fluid flow directly across from the sensor perpendicular to the flowing fluid... | 10/31/1989 |
| 4875782 | Automated temperature probe apparatus and method An apparatus and method for measuring the temperature of a viscous material flow by traversing at least a portion of the flow stream are provided. The apparatus includes an elongated temperature probe which is linearly translated by a motor which has a po... | 10/24/1989 |
| 4776214 | Mass air flow sensor Several embodiments for mass airflow sensors are illustrated herein. In each case a sensing element (11) for the mass airflow sensor (10, 34, 50) is provided on a first portion (18) of a thin flexible film substrate (19) while an extension of this substra... | 10/11/1988 |
| 4776213 | Mass airflow meter A mass airflow meter for positioning within a duct wherein a fluid flows, particularly an air intake of an internal combustion engine, includes a symmetrical body having an axial passageway and a radial passageway. The radial passageway has a temperature ... | 10/11/1988 |
| 4726225 | Surface acoustic wave gas flow rate sensor with self-heating feature A surface acoustic wave device for measuring the mass flow rate of a gas includes a surface acoustic wave delay line formed of a piezoelectric substrate and having a temperature coefficient of delay on the order of 10-4 /°C. The substrate has ... | 02/23/1988 |
| 4654803 | Photothermal deflection method of measuring fluid velocity A method of measuring the velocity of a fluid by noninstrusive means comprises passing a pump laser beam pulse through the fluid wherein the fluid contains a constituent absorbing the wavelength of the laser so that a temperature gradient, and therefore a... | 03/31/1987 |
| 4548516 | Sequential thermography fluid flow indicator An apparatus for indicating the fluid flow through implanted shunts by temperature sensing. The sensor comprises a series of thermistors carried by a flexible substrate mounted on a rigid support. The sensors are placed in external proximity to a section ... | 10/22/1985 |
| 4484472 | Concentric rod and tube sensor for thermal mass flow controller and flow meter A concentric rod and tube sensor for a thermal mass flow controller or flow meter is disclosed. The flow meter has a flow passage therethrough for measuring the flow rate of a fluid and includes a heater for heating the fluid flowing therethrough. The flo... | 11/27/1984 |
| 4354504 | Thermal diffusion flow probe A blood-flow probe utilizing two-terminal integrated circuit temperature transducers each of which produces an output current proportional to the absolute temperature of the probe contact plate with which the temperature transducer is associated. One such... | 10/19/1982 |
| 4339949 | Process and apparatus for the thermal measurement of mass flow A thermal measurement of mass flow is obtained by passing a flowing mass through a hollow passageway, measuring the temperature of the mass at the inlet and at the outlet of said passageway and additionally measuring the heat flow released or absorbed thr... | 07/20/1982 |
| 4326780 | Portable thermo-anemometer with bimetallic sensor An extremely sensitive portable thermo-anemometer comprises: (1) a matched pair of preformed bimetallic cantilevers which are arranged symmetrically to face and bend toward each other upon a temperature change and which also functions as a vibrating conta... | 04/27/1982 |
| 3990443 | Drop rate sensing and regulating apparatus An apparatus, for example, an intravenous drop-feed apparatus for sensing the rate at which liquid drops fall along a predetermined vertical path and for regulating this drop rate to be substantially equal to a preselected drop rate includes a disposable ... | 11/09/1976 |
| 3975941 | Oil well rate metering method A process for determining the production rate of an oil well by measuring the intensity of radiant heat from a fire at the end of a flowline leading from the oil well. The oil from the well head is lead through a horizontal flowline to a burn pit and igni... | 08/24/1976 |
