Design of PT100 high-precision temperature measurement systems based on third-order model
Wei Wang, Mingxia Yang, Liyuan Yu, Dali Liu · Ferroelectrics · 2020
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.