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通常市场上的数显温度计其传感器都是热电阻的，原理就是温度的变化会使传感器的阻值呈规律性的变化，这样的话，根据变化的曲线写好程序就可以显示出相应的温度了。热电偶的要复杂点，涉及到热电动势，也就是所谓的塞贝克效应。

Usually, the digital thermometers in the market are all thermoelectric sensors. The principle is that the change of temperature will make the resistance of the sensor change regularly. In this way, according to the curve of the change, we can write the program to show the corresponding temperature. The thermocouple to be more complex, involving the thermoelectric power, also is called the Seebeck effect.