TC-Ⅱ导热系数测定仪温度测控电路的改进设计  

An improved design of temperature measurement and control circuit for TC-Ⅱ heat conductivity measuring apparatus

作　　者：杨运经[1] 贾根良[1] 张敏[1] 

机构地区：[1]西北农林科技大学应用物理系,陕西杨凌712100

出　　处：《大学物理》2016年第6期36-40,共5页College Physics

基　　金：西北农林科技大学教改项目(JY1102116)资助

摘　　要：TC-Ⅱ导热系数测定仪基于稳态法测量材料的导热系数.实验教学中发现:使用该测定仪时,非稳态过渡时间长,稳态不易准确判定;热电偶测温需用对其冷端温度补偿且将温差电动势与温度之间线性化近似.由此影响到学生测定结果的准确性与重现性.针对上述问题,本文设计了一种结构简单TC-Ⅱ导热系数测定仪温度测控改进电路,可有效地提高导热系数测量的准确性与重现性.TC-Ⅱ heat conductivity measuring apparatus can be used to measure the heat transfer coefficient of material based on the stability method. However,experimental teaching activity shows that students have difficulty in determining the steady state using the TC-Ⅱ measuring apparatus due to long unsteady transition time,and the thermocouple temperature measurement needs cold end temperature compensation and the linear approximation between thermoelectric potential and the temperature. Therefore,the accuracy and repeatability of the students＇ measurement results are affected by the above issues. This paper proposes a temperature measurement and control improved circuit with a simple structure. It can effectively improve the accuracy and reproducibility of thermal conductivity measurement.

关 键 词：导热系数 稳态法测量 温度测控 改进设计 

分 类 号：O551.3[理学—热学与物质分子运动论]