The analysis of temperature compensation of the transient piezoresistive ultra-high pressure sensor

Abstract

The ultra-high pressure piezoresistive sensor works with the Wheatstone half bridge theory. Because of the electric resistance temperature coefficient difference and the four electric resistances value of bridge arm are different in the manufacturing, zero drift and zero temperature drift generally exist in practical application of the ultra-high pressure piezoresistive sensor, which leads to loss of measuring accuracy of sensor. It requires a normalized polynomial fitting algorithm to achieve null balance and compensate zero drift simultaneously. According to model analysis and deduction as well as experiments, statistics obtained through normalized polynomial fitting algorithm is the same as experiments and shows higher accuracy, better compensation effect. The ultra-high pressure piezoresistive sensor compensated by the software method can be widely used in pressure testing and research on interior ballistics, especially the high pressure gun under the high temperature, high pressure, and high impact environment.