Temperature insensitive pressure sensor

Details Temperature insensitive pressure sensor Temperature insensitive pressure sensor

2006-08-15

2006-08-15

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

C073S715000, C073S716000

Reexamination Certificate

active

07089797

ABSTRACT:
A pressure sensor that compensates for variations in temperature by having first (53) and second (51) chambers with first and second respective flexible membranes. The first and second flexible membranes deflect in response to pressure differences within the first and second chambers respectively. The first membrane is exposed to the fluid pressure (66) to be measured, such as the air pressure in a tire. The second membrane sealed from the fluid pressure, and, associated circuitry converts the deflection of the first flexible membrane into an output signal related to the fluid pressure, and converts the deflection of the second membrane into an adjustment of the output signal to compensate for the temperature of the sensor.By sealing the second chamber from the tire pressure, the deflection of the second membrane can be determined as a function of temperature. This can be used to calibrate the output signal from the first chamber to remove the effects of temperature variation.

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