Patent ID: 7165460
Filing Date: 2007-01-23
Classification: G01L

Abstract:
1. A pressure sensor comprising: a sensor membrane exposed to fluid at a known pressure on one side, and exposed to fluid at a pressure to be sensed on its opposite side, the sensor membrane being at least partially formed from a conductive material; a reference membrane exposed to a first reference pressure on one side, and exposed to a second reference pressure on its opposite side, the reference membrane being at least partially formed from a conductive material; associated circuitry connected to both the sensor membrane and the reference membrane for converting deflection of the sensor membrane into an output signal indicative of a pressure difference between the known pressure and the fluid pressure to be sensed; wherein, the associated circuitry converts deflection of the reference to a temperature compensation value used to adjust the output signal to provide a temperature compensated output indicative of the pressure to be sensed.