Patent ID: 7783448

Claim:
A method of sensing pressure with a pressure sensor, the method comprising: subjecting the pressure sensor having on output P which varies based on the sensor's frequency F and the temperature T to several different temperatures and applied pressures; determining the pressure sensor's frequency F at the different temperatures and applied pressures and collecting data points representing the same; from the data points and at each different temperature, generating several polynomials P=ƒ(F) and T=ƒ/(F); using the pressure sensor to sense an unknown pressure Pμ at a temperature Tμ at which the pressure sensor has a frequency Fμ; selecting, from the generated polynomials, polynomials that surround Tμ and Fμ; evaluating the selected polynomials for Fμ to calculate values for P=ƒ(Fμ) and T=ƒ(Fμ); from the calculated values, generating a polynomial P=ƒ(T); and solving Pμ=ƒ(T) for Tμ and outputting Pμ.