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热电偶是一种常用的测量温度的器件,它是由二根不同性质的导线A、B焊接在一起而组成的。对于一定的导线A、B,线路中产生的电动势是它的二个接点T_1、T_2的温度函数,如图1(a)所示,其中一个接点放在被测温度中(称为测量接点),另一接点放在一已知的温度中(称为参考接点),如果在热电偶回路中接入第三种金属C,只要C的两端处在相同温度,则对温差电动势没有影响。如果选择合适的材料A、B组成热电偶,使热电势与温度成线性关系或近似线性的单
Thermocouple is a commonly used temperature measurement device, which is composed of two different nature of the wire A, B welded together. For a certain wire A, B, the electromotive force generated in the line is the temperature function of its two contacts T_1, T_2, as shown in Figure 1 (a), one of the contacts placed in the measured temperature (called the measuring contact) And the other contact at a known temperature (referred to as the reference junction). If the third metal C is connected to the thermocouple circuit, there is no effect on the thermoelectric force as long as both ends of C are at the same temperature. If you choose the right material A, B composed of thermocouples, so that the thermoelectric power and temperature linear or approximately linear single