The working principle of the infrared thermometer is based on the thermal radiation principle of the object. Specifically, its working principle can be divided into the following steps:

The object emits thermal radiation: According to the temperature of the object, it will emit a certain amount of thermal radiation, including infrared radiation with the most heat. All objects above absolute zero will radiate infrared rays by themselves, and the radiation energy of infrared rays is related to the temperature of the object itself.

Receiving infrared radiation: The infrared thermometer uses its special optical system (such as a lens) to gather the infrared radiation energy of the target object in the field of view and focus the infrared energy on the photodetector. The infrared sensor receives the infrared radiation emitted by the object, and the power of the infrared radiation is proportional to the temperature of the object.

Filtering other radiation: In order to ensure the accuracy of the measurement, the infrared thermometer will block other irrelevant radiation, such as visible light and ultraviolet radiation, through a filter plate or window.

Electrical signal conversion: The infrared sensor converts the received infrared radiation into a corresponding electrical signal.

Temperature calculation: By processing and calculating the electrical signal, the infrared thermometer can determine the temperature value of the target surface.
In addition, infrared thermometers also have the characteristics of non-contact measurement, which makes the measurement process more hygienic and convenient. However, it should be noted that infrared thermometers can only measure the temperature of the surface of objects, not the internal temperature. At the same time, when using it, you should also pay attention to environmental conditions (such as steam, dust, smoke, etc.) and the applicable scope of the thermometer (such as not being able to measure temperature through glass, not being suitable for measuring temperature on shiny or polished metal surfaces, etc.).

In general, infrared thermometers use infrared radiation emitted from the surface of an object to measure temperature, and finally obtain the temperature value of the surface of the object through steps such as lens focusing, electrical signal conversion and temperature calculation.

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