Infrared Radiation

Infrared RadiationInfrared radiation, infrared rays and electromagnetic radiation occupy the spectral domain between the red end of visible light spectrum and short-wave radio-frequency emission. The infrared spectrum range is provisionally classified into near, intermediate and far-infrared radiation. V. Herschel, a genius English scientist, discovered infrared radiation in 1800. Then it was proved that infrared radiation is in line with optical laws, therefore, its nature is similar to visible light. Similar to visible and ultraviolet radiation spectra, infrared radiation spectrum may either be made up of discrete lines or be continuous. This depends on infrared radiation source. Generally, optical properties (transparency, reflection factor, and refraction factor) within the infrared domain substantially differs from properties occurring within visible and ultraviolet domains. Many substances transparent within the visible domain turn out to be non-transparent in the infrared domain and vice versa.The Earth atmosphere attenuates infrared radiation as it disperses and is absorbed. Nitrogen and oxygen contained in air do not absorb infrared radiation. Though they attenuate radiation due to its dispersal. However, it disperses less than visible light. Water vapors, carbon-dioxide, ozone and other air impurities selectively absorb infrared radiation. Water vapors whose absorption bands lie within almost the whole infrared spectrum domain are the most intensive infrared ...

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