基于热电偶的测温仪表冷端补偿方法

›› 2015, Vol. 28 ›› Issue (10): 145-.

基于热电偶的测温仪表冷端补偿方法

黄毅,周汉义,陶庆栋,李云

(合肥工业大学材料工程系,安徽合肥 230009)

出版日期:2015-10-15 发布日期:2015-10-29
作者简介:黄毅(1989—),男,硕士研究生。研究方向:自动化。E-mail:Supermanhy1010@163.com

Cold Junction Compensation in Thermocouple Thermometers

HUANG Yi,ZHOU Hanyi,TAO Qingdong,LI Yun

(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

Online:2015-10-15 Published:2015-10-29

摘要/Abstract

摘要： 热电偶是测温仪表中常用的温度传感器之一。在测温过程中,难以保证热电偶冷端恒温,所以对测量结果必须进行冷端补偿。文中以热电偶工作原理为基础,由PT1000测量冷端温度,通过A/D转换后由MCU传给上位机,将电阻值通过软件换算成电压值加到热电偶的电压上,再通过补偿块消除冷端温度变化带来的影响,从而进行补偿。试验表明,该方法不仅测量精度高,且工作稳定。

关键词: 热电偶, 冷端补偿, 温度传感器

Abstract: The thermocouple is one of the common temperature sensors used in thermometers.In the measurement of temperature,it is difficult to maintain stable temperature for the thermocouple cold junction,so the results need cold-junction compensation.In this paper,the cold junction temperature measured by PT1000 is sent to the MCU of the host computer after A/D conversion to convert the resistance value by software into a voltage value,which is added to the voltage applied to the thermocouple,and then the effects of the temperature change in the cold junction is eliminated by the compensation module.Tests show that the method is accuracy and stable.

Key words: thermocouple;cold junction compensation;temperature sensor

中图分类号:

TB942

黄毅,周汉义,陶庆栋,李云. 基于热电偶的测温仪表冷端补偿方法[J]. , 2015, 28(10): 145-.

HUANG Yi,ZHOU Hanyi,TAO Qingdong,LI Yun. Cold Junction Compensation in Thermocouple Thermometers[J]. , 2015, 28(10): 145-.

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