The error compensation for static hysteresis characteristics of Giant Magneto-Resistance sensor

摘要

The hysteresis is an important factor influencing the measurement accuracy of Giant Magneto-Resistance sensor (GMR). This paper takes the error compensation of static hysteresis as a breakthrough point to study. At first, a testing apparatus of static hysteresis characteristics is designed. After that, the method of polynomial hysteresis error compensation is proposed by T(x) model based on hyperbolic tangent function. Then the current or magnetic field value is obtained by inversing T(x) model. Compared to output of GMR sensor, T(x) inverse model reduces the influence of hysteresis on measurement accuracy, and improves the Linear working range and linearity.