基于铂电阻的温度测量仪的设计与实现

Design and Implementation of Temperature Measuring Instrument Based on PT100

针对大亚湾中微子实验中,需要精确测量掺钆液闪温度的问题,设计并实现了一种基于铂电阻的分布式温度测量仪;该测量仪可以同时测量多点的温度,并将测量结果通过网络传输到数据服务器中,从而实现远程在线监测;为解决器件温漂带来的误差问题,该文采用了3电阻测量法的自校正技术,通过比较3组测量信号的相对大小来求得被测热电阻的电阻值,进而计算出温度值;通过计量炉的实测的数据比较,测量误差小于0.059℃,满足测量精度需求。

In Daya Bay reacrot eutrino experiment, the accurate measurement of the gadolinium--loaded liquid scintillation temperature is necessary. For meeting the demand, a distributed temperature measuring instrument based on platinum resistance was designed and presented in this paper. The proposed measuring instrument can not only measure multiple temperatures synchronously, but also send the data to the data server via a network, so as to complete the long--range online monitoring. For correcting the error caused by the temperature shifting of the device, a self--correction technology based on 3 resistance measurement method was used. In that method, the resistance values were obtained by comparing the three signals. Furthermore, the temperature can be calculated. Comparing to the measured data of the measurement stove, the error was small than 0. 059℃ and met the demand of accuracy.