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Night
vision goggles are a type of eye-wear that allows you to see in
the dark. Although most often used by military, they are also very
popular for hunting, wild life observation, or boating. Night
Vision Gear offers quality affordable night
vision goggles manufactured by reputable companies such as ATN,
Bushnell
or Yukon
Night Vision.
Night
vision goggles are typically one of two types:
Passive night vision goggles - pick up any light in the given area and amplify it several thousand times. Often a dim star in the sky is enough to illuminate an entire field. This type is commonly used for war reporting, tinting the picture green. The color green is chosen because the human eye is most sensitive and able to discern the most shades in green.
Active night vision goggles - project infrared
light (the same type used by a remote control), and then bases the
visualization off the light reflected back. It is essentially a passive
flashlight, where the only way to see the illuminated area is through
an image enhancer. This feature is commonly found on home video cameras,
as it suits most consumers' needs for seeing in the dark. Interestingly
enough, pointing a television remote control at this type of system
is glaringly bright.
Night vision goggles work by photoelectric effect. As a photon collides with a detector plate, the metal ejects several or many electrons that are then amplified by a series of electron ejections onto a phosphor screen.
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