Friday, April 19, 2013

INIFRA RED COMMUNICATIONS


Infrared is an energy similar to visible light, but with a longer wavelength. Infrared energy
is invisible to the human eye, however, while visible light energy is emitted by objects only at a
very high temperature; infrared energy is emitted by all objects at ordinary temperatures. Since
thermal imager’s sense infrared energy which varies with the temperature of objects in a scene, the
image generated provides a thermal signature of the scene. This image can be displayed on a
standard video monitor. Infrared energy from objects in a scene are focused by optics onto an
infrared detector. The infrared information is then passed to sensor electronics for image
processing. The signal processing circuitry translates the infrared detector data into an image that
can be viewed on a standard video monitor
In infrared communication an LED transmits the infrared signal as bursts of non-visible
light. At the receiving end a photodiode or photoreceptor detects and captures the light pulses,
which are then processed to retrieve the information they contain.

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