标度变换技术在精密温度测量系统中的应用研究  

Application of scale conversion technology in precision temperature measurement system

作　　者：焦新泉 许超 贾兴中 臧冠宇 JIAO Xinquan;XU Chao;JIA Xingzhong;ZANG Guanyu(College of Instruments and Electronics,North University of China,Taiyuan 030051,China;96791 Troops,Alxa 750306,China)

机构地区：[1]中北大学仪器与电子学院,山西太原030051 [2]96791部队,内蒙古阿拉善750306

出　　处：《电子设计工程》2022年第6期91-94,99,共5页Electronic Design Engineering

摘　　要：以K型热电偶为例,介绍了一种在精密测量系统中传感器输出模拟量(电荷或电压信号)与被测对象实际工程值对应关系的线性系数标定方法。另针对温度传感器进行误差分析,采用分段拟合方法对温度测量的非线性误差进行校正与补偿,进一步修正线性系数,从软件上提高系统温度测量的精度。用标准恒温箱和计量检测专用的精密热工仪表校验仪对数据处理进行验证。结果表明,温度测量系统通过该方法的标定能够精确地再现试验时给定的温度变化,具有较高精度。在25~500℃范围内,温度误差低于0.2℃,该线性系数标定方法可应用于工业生产和军事领域的高精度测温场合。Taking K-type thermocouple as an example,a linear coefficient calibration method for the relationship between the analog output of the sensor(charge or voltage signal) and the actual engineering value of the measured object in the precision measurement system is introduced. In addition,the nonlinear error of temperature measurement is corrected and compensated by piecewise fitting method,and the linear coefficient is further corrected to improve the accuracy of temperature measurement in software.The standard thermostat is used to verify the data processing.The results show that the temperature measurement system can accurately reproduce the given temperature change during the experiment by the calibration of this method,and has high precision.The temperature error is less than 0.2 ℃ in the range of25 ℃ to 500 ℃.The linear coefficient calibration method can be applied to high precision temperature measurement in industrial production and military field.

关 键 词：标度变换 精密测量 K型热电偶 分段拟合 残差分析 非线性误差修正 

分 类 号：TN98[电子电信—信息与通信工程]