Thermal expansion compensated pressure sensor
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United States of America Patent
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May 6, 2008
Grant Date -
Mar 22, 2007
app pub date -
Nov 27, 2006
filing date -
Oct 18, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pressure sensor (30) for environments with wide ranging temperatures such as vehicle tires. The sensor has a conductive sensor membrane (53) exposed to the fluid pressure to be sensed, and a similarly conductive reference membrane subject to a predetermined pressure difference. Both membranes are connected to circuitry that converts the deflection in the sensor membrane into an output signal indicative of the pressure difference across the sensor membrane, and converts the deflection of the reference membrane into a thermal expansion compensation value used to adjust the output signal in response to temperature variations in the pressure sensor's environment.
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