Principle Of Infrared Thermometer

In nature, all objects whose temperature is higher than absolute zero are constantly emitting infrared radiation energy to the surrounding space. The size of the infrared radiant energy of an object and its distribution according to wavelength-have a very close relationship with its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined, which is the objective basis on which infrared radiation temperature measurement is based.

The infrared thermometer is composed of optical system, photodetector, signal amplifier, signal processing, display output and other parts. The optical system concentrates the infrared radiation energy of the target in its field of view, and the size of the field of view is determined by the optical parts of the thermometer and its position. The infrared energy is focused on the photodetector and converted into a corresponding electrical signal. The signal passes through the amplifier and signal processing circuit, and is converted into the temperature value of the measured target after being corrected in accordance with the internal therapy algorithm of the instrument and the target emissivity. In addition, the target and the environmental conditions where the thermometer is located should also be considered, such as the influence of temperature, atmosphere, pollution and interference on performance indicators and correction methods.