Abstract In view of the non-linearity of the output of the PT100 sensor, this article describes the temperature characteristics of the PT100 with a third-order model. The mathematical model of pt100 and standard thermometer IRTD is analyzed. The transfer function of pt100 and IRTD is evaluated by step response experiment. A least squares method based on transfer function is proposed as a compensation algorithm, MATLAB is used for simulation calculation. The proposed algorithm can make the maximum error of pt100 temperature measurement to 0.05, and the minimum error can reach to 0.0001, which is achieving the requirements of high precision.

中文翻译：

---

基于三阶模型的PT100高精度测温系统设计

摘要 针对PT100传感器输出的非线性，本文用三阶模型描述PT100的温度特性。分析了pt100和标准温度计IRTD的数学模型。pt100 和 IRTD 的传递函数通过阶跃响应实验进行评估。提出一种基于传递函数的最小二乘法作为补偿算法，利用MATLAB进行仿真计算。提出的算法可以使pt100测温的最大误差达到0.05，最小误差达到0.0001，达到了高精度的要求。