Web Definition: Infrared
Infrared radiation is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation. The name means below red, red being the color of visible light of longest wavelength. Infrared radiation spans three orders of magnitude & has wavelengths between 700 nm & 1 mm. The Earth s surface absorbs visible radiation from the sun & re-emits much of the energy as infrared back to the atmosphere. Certain gases in the atmosphere, chiefly water vapor, absorb this infrared & re-radiate it in all directions including back to Earth. This, the greenhouse effect, keeps the atmosphere & surface much warmer than if the infrared absorbers were absent from the atmosphere. near infrared NIR, IR-A DIN, 0,7–1,4 µm in wavelength, defined by the water absorption & commonly used in fiber optic telecomunication because of the low attenuation losses in the SiO 2 glass medium. short wavelength IR SWIR, IR-B DIN, 1,4–3 µm Water absorption increases significantly at 1450 nm.
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