Wednesday 6 July 2011

infrared technology


Infrared (IR) light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.7 micrometers, and extending conventionally to 300 micrometres. These wavelengths correspond to a frequency range of approximately 430 to 1 THz,[1] and include most of the thermal radiation emitted by objects near room temperature. Microscopically,
IR light is typically emitted or absorbed by molecules when they change their rotational-vibrational movements.

Sunlight at zenith provides an irradiance of just over 1 kilowatt per square meter at sea level. Of this energy, 527 watts is infrared radiation, 445 watts is visible light, and 32 watts is ultraviolet radiation.
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