In nature, any object with a temperature higher than OK is a source of infrared radiation and has a radiation phenomenon. After the power signal radiated by the object is converted into an electrical signal by the infrared detector, the output signal of the imaging device can completely simulate the spatial distribution of the surface temperature of the scanned object in one-to-one correspondence. Thermal image corresponding to the heat distribution on the surface of the object. Using this method, it is possible to achieve long-distance thermal state imaging and temperature measurement of the target, and to analyze and judge the state of the object to be measured.

 

The basic theory of infrared detection is based on Planck's law of thermal radiation and Stefan-Boltzmann's law, that is, a method for detection using the relationship between the radiation energy of an object and temperature. It performs infrared inspection by scanning and recording temperature changes on the surface of the tested part due to defects and different thermal properties of materials. According to the Stefan-Boltzmann law, when the emissivity of an object's surface is constant, the radiated power of the object is proportional to the fourth power of its temperature. Therefore, the detection of the radiation power of the object actually forms the detection of the surface temperature of the object.