16-01-2013, 01:23 PM
Infrared Detectors
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INTRODUCTION
What are infrared detectors?
An infrared detector is simply a transducer of radiant energy, converting radiant energy in the infrared into a measurable form. Infrared detectors can be used for a variety of applications in the military, scientific, industrial, medical, security and automotive arenas. Since infrared radiation does not rely on visible light, it offers the possibility of seeing in the dark or through obscured conditions, by detecting the infrared energy emitted by objects.
Under infrared light, the world reveals features not apparent under regular visible light. People and animals are easily seen in total darkness, weaknesses are revealed in structures, components close to failure glow brighter, visibility is improved in adverse condition such as smoke or fog.
PRINCIPLE OF WORKING
Infrared (IR) detectors have been called the eyes of the digital battlefield.
Infrared detectors are transducers of radiant energy. Since infrared radiations do not rely on visible light, they offer possibility of seeing in the dark or through obscured conditions, by detecting the infrared energy emitted by objects. The detected energy is translated into imagery showing the energy differences between objects. Hot objects such as people stand out from the typically cooler backgrounds (Fig.4) regardless of the available visible light. Under infrared light, the world reveals features not apparent under regular visible light. People and animals are easily seen in total darkness, weaknesses are revealed in structures, components close to failure glow brighter, visibility is improved in adverse condition such as smoke or fog.