Air flow sensor
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United States of America Patent
Stats
-
Nov 8, 1983
Grant Date -
N/A
app pub date -
May 22, 1981
filing date -
May 22, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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