基于序列激励电压控制的高精度测温方法研究

Research on high-precision temperature measurement method based on driving power sequences

针对高精度测温领域存在的非线性、热电动势及自热效应等问题,设计了一种基于序列激励电压控制的高精度测温方法。采用阻值比较法可以减小测温回路非线性;设计序列激励电压控制消除热电动势,并有效抑制自热效应。给出了测温电路的总体设计方案、测温电路非线性分析以及序列激励电压控制的设计方法。在-40^+200℃范围下,测温精度能达到±0.008℃,具有精度可靠性高、使用方便等优点,可广泛应用于工业生产及军事领域的温度检测。

Aiming at the problems of nonlinearity,thermal electromotive force and self-heating effect in high-precision temperature measurement field, a high-precision temperature measurement method based on the driving power se- quences is designed. The method uses the resistance comparison method to decrease the nonlinearity of the measure- ment circuit. It also designs the driving power sequences to eliminate the thermal electromotive force, and restrains the self-heating effect efficiently. The overall design scheme and nonlinearity analysis of the measurement circuit, as well as the design method of the driving power sequences are given in this paper. The precision obtained using this method can reach - 0. 008 ℃ in the range from - 40 ℃ to ＋ 200 ℃. The proposed method has the characteristics of high precision, high reliability and easy to use, and can be used in the temperature measurement in industrial production and military field widely.