How infrared goggles work?

Published: 21st June 2010
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There are two types of night vision infrared goggles, one is active, the other is passive. The night vision infrared goggles are the active type, or can be simply called as infrared goggles.



The mechanism of night vision infrared goggles is like this. It is a bulky device that should be mounted on the head in front of eyes. When it works, a device in the night vision infrared goggles will cast infrared light over an area. Infrared light is non-visible to human, but a special camera (lenses) in the night vision infrared goggles can see the objects within the infrared range. The camera lets in the light and objects and then transfers the image to the wearer, so the wearer can see the objects through the night vision infrared goggles.



This active type of night vision infrared goggles were first introduced and used during World War II by snipers searching for some targets at night. But as this type of night vision infrared goggles is active to emit infrared light over the area of searching, though the light can't be seen by human, but can easily be recognized by enemies wearing the same goggles. Actually infrared goggles are no longer military grade any more. But night vision infrared goggles are still widely used for the purpose of property security and other civil utilizations.



With the advancement of technology night vision infrared goggles have also greatly increased performance while the cost of them greatly reduced, hence the hobbyists can afford to buy one for fun, and even kids can have cheap yet functional toys of night vision infrared goggles to explore at night for something beyond human's visual range.



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