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当物体的温度超过绝对温度(即°K)时均能产生电磁辐射,低温热辐射的波长主要在0.75～30μm的红外线波段,而所辐射的能量与温度高低成一定的比例关系,其光谱辐射密度Eλ按波长分布符合普郎克公式:
When the object temperature exceeds the absolute temperature (° K) can produce electromagnetic radiation, low-temperature thermal radiation wavelength is mainly in the 0.75 ~ 30μm infrared band, and the radiation energy and temperature is a certain proportion of the relationship between its spectral radiation Density Eλ according to the wavelength distribution in line with Praxel formula: