The size of the thermoelectromotive force in the thermocouple loop is only related to the conductor material that composes the thermocouple and the temperature of the two junctions, and has nothing to do with the shape and size of the thermocouple. When the two electrode materials of the thermocouple are fixed, the thermoelectromotive force is the function difference between the two junction temperatures t and t0. This relationship has been widely used in practical temperature measurement. Because the cold end t0 is constant, the thermoelectromotive force generated by the thermocouple only changes with the temperature of the hot end (measurement end), that is, a certain thermoelectromotive force corresponds to a certain temperature. We only need to measure the thermoelectromotive force to achieve the purpose of temperature measurement. The basic principle of thermocouple temperature measurement is that two kinds of material conductors with different compositions form a closed loop. When there is a temperature gradient at both ends, a current will flow through the loop, and there will be an electromotive force-thermo-electromotive force between the two ends, which is the so-called Seebeck effect. The two homogeneous conductors of different compositions are the hot electrodes, and the end with the higher temperature is the working end. The lower temperature end is the free end, which is usually at a constant temperature. According to the functional relationship between thermoelectromotive force and temperature, a thermocouple indexing table is made; the indexing table is obtained under the condition that the temperature of the free end is at 0 °C, and different thermocouples have different indexing tables.
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