铂电阻测温正反馈线性化的研究与设计

Research and Design in linearization of Positive Feedback Method for Platinum Resistance Temperature Measurement Circuit

在分析铂电阻测温正反馈线性化电路输出特性的基础上,研究了不同拟合直线对其输出非线性的影响,给出提高测温区域输出信号线性度及灵敏度的设计方法。与传统的三点线性拟合设计法相比,该方法有效地提高电路的测温精度,且简单实用,可满足工业过程高精度测温的需要。

The output characteristic of platinum resistance positive feedback for temperature measurement circuit was ana- lyzed. Based on it, the effect of different fitting line on its nonlinear was researched, and the design method about improving the lin- earity and sensitivity of output signal in temperature region was introduced. Comparing with the traditional method of three-point lin- ear fitting line, this method can increase the temperature measurement accuracy of circuit effectively, simple implement, and practi- cal use. Furthermore,it meets the high-precision temperature measuring in industrial process well.