Infrared thermometer black body radiation law: A black body is an idealized radiator, which absorbs radiation energy of all wavelengths, has no reflection and transmission of energy, and has an emissivity of 1 on its surface. It should be pointed out that there is no real black body in nature, but in order to clarify and obtain the distribution law of infrared radiation, a suitable model must be selected in theoretical research, which is the quantized oscillator model of body cavity radiation proposed by Planck, which leads to Planck's law of black-body radiation, that is, the black-body spectral radiance expressed in wavelength, is the starting point of all infrared radiation theories, so it is called the black-body radiation law.
