Measuring and testing – Volume or rate of flow – Thermal type
Patent
1995-06-20
1998-05-12
Dombroske, George M.
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
057508933
ABSTRACT:
Both of voltage range and supplied power range of a heater can be enlarged, one-sided power source for a driving circuit can be realized easily, power source voltage can be lowered, and flowing velocity can be measured with high accuracy.
First reference resistor is connected in series to fluid temperature measuring body, and second reference resistor is connected in series to heater temperature sensor. Temperature setting resistor for determining set temperature difference between the heater temperature sensor and the fluid temperature sensor is connected in series to the fluid temperature sensor. Bridge circuit is constructed in such way. The voltage of heater temperature sensor is inputted to non-inverted input terminal of differential amplifier, while the voltage of fluid temperature measuring body and temperature setting resistor is inputted to inverted input terminal of the same.
The output terminal of the differential amplifier is connected to a buffer circuit.
REFERENCES:
patent: 5050429 (1991-09-01), Nishimoto et al.
patent: 5072614 (1991-12-01), Hisanaga
patent: 5423212 (1995-06-01), Manaka
Heathkit/Zenith Educational Systems, Semi-conductor Devices, 160 & 161, Dec. 1983.
Miyachi Tatsuo
Murata Norihiko
Artis Jewel V.
Dombroske George M.
Ricoh Co. Ltd.
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