一种高精度铂电阻温度测量方法  

Method of high precision temperature measure based on platinum resistance

作　　者：汪定国[1] 王怡苹[1] 

机构地区：[1]海军航空工程学院科研部,烟台264001

出　　处：《电子测量技术》2012年第11期104-107,共4页Electronic Measurement Technology

摘　　要：提出了一种温度测量方法,以单片机为核心,利用四线制铂电阻温度传感器、恒流源、模拟开关、高分辨率A/D转换器、运放,设计简单的硬件电路,通过多次测量并采用数学算法即可完成高精度的温度测量。该方法有效解决了引线电阻、自热效应和元器件温漂等问题的影响。实验结果表明,利用该方法可将测温精度提高至0.01℃,同时线性度较好,具有很高的应用价值。The paper introduced a method of high-precision temperature measurement by using MCU, four-wire platinum RTD （resistance temperature detector）, constant current source, analog switch, high-resolution A/D converter, operational amplifier. By simple circuit, multi measurements and mathematic algorithm, this method can solve the problems of down-lead resistor, self-heating effect and components＇ temperature drift efficently. Experiment results showed that the method has high temperature measuring accuracy of 0.01℃, good linearity and also high application value.

关 键 词：铂电阻 恒流源 温度测量 自热效应 

分 类 号：TH811[机械工程—仪器科学与技术]