冷端补偿对导热系数测量影响的分析

Analysis of the Influence of Cold End Compensation on the Thermal Conductivity Coefficient

为了研究冷端补偿对不良导体的导热系数的影响,借助傅里叶热传导定律得到导热系数的表达式。控制热电偶冷端补偿测量得到不良导体的导热系数。结果显示,无冷端补偿对测量结果无显著影响,操作简单且成本较低。在实际实验及工程测量中,冷端补偿不是必需的。

In order to study the effect of cold-junction compersation on the thermal conductivity coefficient of poor conductor.First,the expression of thermal conductivity coefficient is derived detailedly according to the Fourier heat equation.Then,measure the thermal conductivity coefficient through two different methods on the cold end compensation and non cold end compensation.In the end,compare and analyze two different measurement methods.Without cold end compensation,the operation is simple and the cost is saved.In the experiment and in the engineering survey,for conditional laboratories and instruments,the instrument can be equipped with cold end compensation.For unconditional laboratories and instruments,the instrument can not be equipped with cold end compensation,it has little effect on the results of the measurement.Through the above research,it has a certain guiding significance for the operation of the experiment and the measurement of the thermal conductivity coefficient.