Measuring and testing – Volume or rate of flow – Thermal type
Patent
1978-09-29
1980-07-29
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
042144787
ABSTRACT:
Airflow measuring apparatus utilizes a temperature-varying resistance layer on a carrier as a sensor. The resistance and temperature of the temperature-varying resistance layer are maintained substantially constant by a regulator circuit, independent of the amount of cooling by air flowing past the element. To minimize errors resulting from heating and cooling of the carrier, the surface of the carrier which does not have the temperature-varying resistance element is covered by a temperature-independent resistance layer and the current through the temperature independent resistance layer is controlled such that the temperature independent resistance layer is at substantially the same temperature as the temperature-varying resistance layer. Thus thermal gradients in the carrier are eliminated.
REFERENCES:
patent: 3352154 (1967-11-01), Djorup
patent: 3603147 (1971-09-01), Dorman
patent: 3604261 (1971-09-01), Olin
patent: 3648518 (1972-03-01), Ranier et al.
patent: 3942378 (1976-03-01), Olmstead
patent: 3992940 (1976-11-01), Platzer, Jr.
Olin "Split-Film Anemometer Sensors" in Instruments and Control Systems vol. 3#6 6/70.
Goldstein Herbert
Robert & Bosch GmbH
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