Air flow sensor

Details Air flow sensor Air flow sensor

1981-05-22

1983-11-08

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

044135149

ABSTRACT:
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 changes in velocity of the stream. A positive coefficient thermistor is supported on the exterior of the housing and compensated for fluctuations in the ambient air temperature. The negative coefficient thermistor is operated at a temperature substantially above ambient. An automatic starting circuit is provided for cold start-up and initially heats the negative coefficient thermistor to the elevated operating temperature.

REFERENCES:
patent: 3068693 (1962-12-01), Ferran et al.
patent: 3123900 (1964-03-01), Millar
patent: 3220255 (1965-11-01), Scranton et al.
patent: 3363462 (1968-01-01), Sabin
patent: 3372590 (1968-03-01), Sterling
patent: 3735752 (1973-05-01), Rodder
patent: 3891391 (1975-06-01), Boone
patent: 4343183 (1982-08-01), Plapp

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