Thermocouple
A thermocouple temperature sensor consists of two dissimilar conductors connected to form a closed circuit. When the two junctions are at different temperatures, a thermoelectromotive force is generated in the circuit, a phenomenon known as the thermoelectric effect. This electromotive force is the well-known Seebeck thermoelectric force, referred to simply as thermo-emf. A thermocouple achieves temperature measurement by detecting this thermo-emf. When the measuring junction is heated, a driving force for the thermoelectric current is induced, the magnitude of which is proportional to the temperature difference between the heated measuring junction and the opposite end (the reference junction). The direct measuring end is called the working junction (hot junction), and the terminal connection end is the reference junction (cold junction). When a temperature difference exists between the hot and cold junctions, a thermoelectric current is generated in the circuit. The thermo-emf generated corresponds to a specific temperature value and increases with the rise of temperature.
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Hu ICP Bei No. 2023002235
