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Radiation, Infrared
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INFRARED RADIATION IS the part of the electromagnetic spectrum popularly (but not entirely accurately) conceptualized as heat. The IR region covers wavelengths that span nearly three orders of magnitude; it is conventional therefore to break this down into further subgroups (Table 1).
Table 1: Conventional breakdown of IR radiation Name Wavelength Comments Near-infrared (NIR) 0.75–1.4μm Absorbed by water and commonly used in fiberoptic technology. Short Wavelength Infrared (SWIR) 1.4–3μm Strongly absorbed by water and used in long-range telecommunications. Mid wavelength Infrared (MWIR) 3–8μm Used in heat-seeking missile technology. Long Wave Infrared / Far IR (LWIR) 8–1000μm Not absorbed by water, therefore used for thermal-image sensors. The main application of IR radiation in relation to climate change is in the fields of meteorology and climatology. Satellite measurements of IR radiation received from the Earth can be used to derive cloud types and ...
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