本文从三种最基本的热电现象出发,通过对接触电位差、温差电动势的分析讨论,对热电偶的测温原理作了新的解释,指出热电动势的真正来源是沿电极的温度梯度。并利用图示法分析了T类和B类热电偶的特性。图6,参5。 Based on the three most basic thermoelectric phenomena, this paper gives a new explanation of thermocouple temperature measurement principle through the analysis of contact potential difference and temperature difference electromotive force. It is pointed out that the true source of thermoelectric force is the temperature gradient along the electrode. The characteristics of T-type and B-type thermocouples were analyzed by graphic method. Figure 6, reference 5.