Device for detecting air flow through a passageway
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United States of America Patent
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-
Apr 13, 1993
Issued Date -
N/A
app pub date -
Mar 28, 1990
filing date -
Aug 17, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device is disclosed for detecting the presence and direction of air flow through a passageway having a first opening and a second opening for air to flow therethrough in either a first direction or a second direction. The device comprises a piezoelectric sensor located within the passageway. A flow director is provided within the passageway for directing air flow through the passageway for impingement upon the sensor. The sensor generates a first electrical signal when air flows through the passageway in the first direction and a second electrical signal when air flows through the passageway in the second direction. A discriminator is electrically connected to the sensor for receiving the first and second electrical signals and for discriminating between the two signals to identify the direction of air flow through the passageway.
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