Nonlinear Rectification for the Circuit of Platinum Resistor in Temperature Measurement
Haibin Yu · Dianzi qijian · 2010
In order to overcome platinum resistance temperature sensor error caused by the nonlinear,the circuit of Platinum resistance temperature is designed based on research about nonlinear characteristics of platinum resistance.In circuit,Non-equilibrium Bridge is driven by constant current source.Use Sub-least-squares method is used to fit reverse indexing function to reduce measurement error caused by platinum non-linear.At last,the paper gives the results of the experiment of temperature measurement system based on stm32f103vbt6.The results show that Non-linear error of Platinum Resistance is less than 0.03%,and temperature error is less than 0.25 ℃,this can meet the needs of the majority of situations.