热敏电阻测量误差的非线性逆滤波器补偿

热敏电阻传感器存在着严重的非线性静态特性和响应滞后的动态特性，当被测量的温度变化率高于传感器的响应速度时，测量结果与真值之间存在较大的误差．为了补偿这个测量误差，文中采用一个由无限响应的IIR滤波器和静态非线性环节构成的非线性滤波器去减小误差．IIR滤波器的系数通过实验数据得到，它是传感器的动态逆模型；非线性静态环节由查表和插值算法实现．该方法能改善热敏电阻的动态特性，具有不依赖传感器模型的特点．实验结果表明，该方法是有效的．

Measurement Error of Thermistor Compensated by Nonlinear Inverse Filtering

Thermistor temperature sensor has serious static nonlinear characteristic and slow dynamic response. When the temperature change rate is too high compared with the response speed of the thermistor, there is an error in the measured temperature. In order to solve this problem, a nonlinear inverse filter was employed. It is composed of a finite impulse response IIR filter and a static nonlinear unit.The coefficient of IIR filter is obtained via experiment, which is an inverse module of sensor's dynamic characteristic. The static nonlinear unit is implemented by the algorithm of table searching and value insertion. The method can be realized without knowing the dynamic model of the sensor. The experimental results show that the method is effective.