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Having the ability to see in darkness has many benefits. The safety applications are the ones that most spring to mind, and therefore the tactical price of night vision is established. Night vision binoculars are a fixture in military operations where stealth or night security is required. These wonders of technology give humans the capability of vision in low-light or even complete darkness, depending on the technology.
Humans do have night vision, even tho very poor night vision. Simply, it is a trade-off between color vision, and light-intensity vision. Night vision binoculars use different technologies to grant humans this critical capability. There are 2 general methods of achieving night vision, and they are to dilate the range of detectable "light" or to intensify what is there. True to the trade-off, many of these devices display images in one color or false color representations.
Scopes and other optical devices like these need a source of infrared light illuminating the target object or area to function. These are called active devices. Unfortunately, the infrared illumination they use can be detected by other devices, so they are used often as deterrents and not for operations that need stealth.
These are rather bulky, but are available to the public. Light amplification capacities for this class can reach as high as 1000x, but without reference to the impressive nominal rating this isn't really much.
Generation two and higher night vision binoculars and devices are proscribed to military and law enforcement use. These give much better night vision, with light amplification ratings at about 20000x for Gen II, and 30000 to 50000x for higher devices. These are the kind used by Special Forces groups, and members of other agencies that need the capacity,eg Homeland Security, the FBI, and intelligence services.
These sense the variations in temperature voiced in lower infrared radiation. The devices then take this information and produces images using false colours to represent different temperature levels. Therefore , users see silhouettes of objects with areas coloured according to a scale for temperature comparison.
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