Thermoelectric sensorIt is a device that converts temperature changes into electrical changes, utilizing the characteristic of the electromagnetic parameters of sensitive components changing with temperature to achieve measurement purposes. Usually, the measured temperature changes are converted into resistance changes and voltage changes of sensitive components, and then output voltage or current through corresponding measurement circuits. The temperature changes of the object are detected by the changes in these parameters. In practical work, besides usingThermoelectric sensorIn addition to temperature measurement, certain physical and chemical properties of objects can also be used to measure temperature based on their relationship with temperature, such as changes in geometric dimensions, color, and pressure.

The resistivity of most metal conductors increases with temperature and has a positive temperature coefficient, which is the basis for thermal resistance temperature measurement. Thermoelectric resistance thermometers widely used in industry are generally used to measure temperatures in the range of -200~+500 ° C. With the development of science and technologyThermal resistanceThe measuring range of the thermometer can reach around 1K at the low temperature end and 1000 ° C at the high temperature end. The characteristic of a thermistor thermometer is high accuracy, suitable for measuring low temperatures. When measuring temperatures below 560 ° C, its output signal is easy to measure with a thermocouple.