A Temperature Compensation Algorithm Based on Curve Fitting and Spline Interpolation

Abstract

The zero and sensitivity of piezo resistive pressure sensors will drift with temperature because of the temperature characteristics of the semiconductor, and it is the main factor causing the measurement error of pressure sensor. For high-precision pressure monitoring system, temperature drift has become an important obstacle to improve performance of the system, especially in the field of applications with large changes of ambient temperature. On the basis of analysing the advantages and disadvantages of a variety of temperature compensation methods, a temperature compensation method combined with polynomial curve fitting and three spline interpolations is proposed, and it can improve the performance of the system.