The working principle of high temperature resistant platinum rhodium thermocouple: Two conductors of different components (called thermocouple wire or thermoelectrode) are connected at both ends to form a loop. When the temperature of the junction is not the same, an electromotive force will occur in the loop. This phenomenon It is called pyroelectric effect, and this electromotive force is called thermoelectric force. Thermocouples use this principle to measure temperature, during which the end that is directly used to measure the temperature of the medium is called the working end (also called the measuring end), and the other end is called the cold end (also called the compensation end); The appearance or matching appearance is connected, and the appearance will point out the thermoelectric potential generated by the thermocouple. A thermocouple is actually an energy converter, which converts heat energy into electrical energy, and uses the generated thermoelectric potential to measure the temperature. Regarding the thermoelectric potential of the thermocouple, the thermoelectric potential of the thermocouple is the difference between the temperature functions of the two ends of the thermocouple, not The function of the temperature difference between the two ends of the thermocouple, the size of the thermoelectric potential generated by the thermocouple, when the thermocouple data is uniform, it has nothing to do with the length and diameter of the thermocouple, only the composition of the thermocouple data and the temperature difference between the two ends. After the two thermocouple wires of the thermocouple are confirmed, the size of the thermoelectric power of the thermocouple is only related to the temperature difference of the thermocouple; if the temperature of the cold end of the thermocouple is certain, the thermoelectric power of the thermocouple is only the working end Single-valued function of temperature. Weld the conductors or semiconductors A and B of two different materials to form a closed loop.
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