多通道热电偶温度采集系统设计与实现  

Design and Implementation of Multi-channel Thermocouple Temperature Acquisition System

作　　者：张旭博 姚雪美 徐贺杨 洪应平[1] ZHANG Xubo;YAO Xuemei;XU Heyang;HONG Yingping(Key Laboratory of Instrumental Science and Dynamic Testing of Ministry of Education,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,太原030051

出　　处：《计算机测量与控制》2025年第4期270-276,321,共8页Computer Measurement &Control

摘　　要：随着温度测量技术迅速发展,近年来在多种工业测温环境中开始使用热电偶来测温,很大程度上提高了用户测量的便利性;针对国内热电偶采集系统多通道、高精度、快速测量的要求,实现了一种使用STM32控制的90通道高精度热电偶温度采集系统,系统采用STM32作为主控单元,使用分辨率为24位的A/D转换器AD7793,并使用K型热电偶传感器实时监测实验环境温度,并使用PT100温度传感器作为冷端补偿,进行热电偶信号的温度校准,最终实现在-20~280℃条件下的90通道热电偶温度监测;该系统支持RS485通信接口,并使用上位机软件实现温度的实时显示和记录;经验证,该系统能够实现90通道温度的精确采集,通过高低温箱进行温度测试该系统符合项目需求指标,且误差范围在±0.25,为工业领域温度测量和记录提供了便利、稳定的工程化解决方案。With the rapid development of temperature measurement technology,thermocouples are increasingly used in various industrial temperature measurement environments in recent years,greatly enhancing the convenience of users'measurements.To meet the requirements of multi-channel,high-precision,and rapid measurement of domestic thermocouple acquisition systems,a 90-channel high-precision thermocouple temperature acquisition system controlled by STM32 is developed.The system uses STM32 as the main control unit,a 24-bit resolution A/D converter AD7793,and K-type thermocouple sensor to monitor the temperature of the experimental environment in real time,and adopts PT100 temperature sensor as the cold end compensation to calibrate the temperature of the thermocouple signal.Finally,it achieves 90-channel thermocouple temperature detection with a temperature range from-20 to 280℃.The system supports RS485 communication interface and uses upper computer software to achieve real-time temperature display and recording.After verification,the system can accurately collect the temperature of 90 channels.Through temperature tests in high and low-temperature chambers,the system meets the requirements and indicators of the project,with an error range of±0.25℃.It provides a convenient and stable engineering solution for temperature measurement and recording in the industrial field.

关 键 词：温度采集 热电偶 冷端补偿 STM32 多通道 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]