Principle and Application of Infrared Thermopile Sensor

Principle and Application of Infrared Thermopile Sensor

1. The principle of the infrared thermopile sensor


As long as any object is above absolute zero, it will radiate energy at a certain wavelength, but the radiation energy in the low temperature section is very weak. At room temperature, all objects in nature are emission sources of infrared radiation, but the wavelengths of infrared radiation are different.


The non-contact temperature sensor is made by using the principle that the radiant energy of an object changes with temperature.


2. The application of the infrared thermopile sensor


The infrared thermopile sensor converts the absorbed infrared radiation into heat energy, and converts the temperature change into an electronic signal, which is amplified and displayed.


As a non-contact infrared temperature sensor, the infrared thermopile can quickly measure the surface temperature of the object without direct contact with the object to be measured. It can measure high-temperature, dangerous or moving objects without contaminating or damaging the object to be measured.


At present, it has been widely used in forehead thermometers, ear thermometers, smart home appliances, lamp switches, food temperature detection and other fields.


Infrared thermopile is based on the principle of the Seebeck effect. Two materials with different Seebeck coefficients are connected in series to construct a closed loop (i.e. a pair of thermocouples). The warmer end is often called the "hot junction" and the colder end is called the "cold junction", and the charge carriers in the material move in the direction of decreasing temperature gradient, causing charge to accumulate at the cold junction, and a thermoelectric potential is generated in the loop.

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