超低温精密智能铂电阻温度变换器设计  

Design of precision smart platinum resistance transmitter for ultra-low temperature measurement

作　　者：刘辉 张恽 董帅 LIU Hui;ZHANG Yun;DONG Shuai(Beijing Research Institute of Telemetry,Beijing 100076,China)

机构地区：[1]北京遥测技术研究所,北京100076

出　　处：《遥测遥控》2020年第1期45-51,共7页Journal of Telemetry,Tracking and Command

摘　　要：以16位MSP430CPU为核心,通过可编程增益模数转换器AD7715的应用,实现涵盖超低温度在内的全量程温度测量。利用AD7715自带的校准功能,消除增益与零点的漂移和误差,设计出免于调试、可完全互换的铂电阻测试数字化、智能化平台。通过不同温度段温度--电阻函数,解决温度精确计算的难题。测试结果表明:智能铂电阻温度变换器可以与各不同温度段的铂电阻温度传感器匹配,通过简便的传感器校准特性输入设置,消除通用传感器特性造成的误差,获得更高的测试精度。With the16-bit MSP430 CPU as the core,full-scale measurements including ultra-low temperature are realized through the application of programmable gain analog-to-digital converter AD7715 connected to platinum resistance sensors.With the self-calibration capability of the AD7715,the drift and error of the device are removed.The problem of temperature accurate calculation is solved by the temperature-resistance function of different temperature segments.The experimental results show that the smart platinum resistance temperature transmitter can be directly matched with the platinum resistance sensors of different temperature segments.With the calibration parameter set of the sensor,the error caused by the universal sensor characteristics is eliminated and higher accuracy is obtained.

关 键 词：超低温度测量 智能温度变换器 增益与零点自校准 非线性校准 

分 类 号：TH811[机械工程—仪器科学与技术]