Image Intensifier
Night vision takes the small amount of light that's in the surrounding area (such as moonlight or starlight), and converts the light energy (photons), into electrical energy (electrons). In the image intensifier tube, photons enter the photocathode which in turn releases electrons. These electrons pass through a thin disk (a microchannel plate) that's about the size of a quarter and contains over 6 million channels. As the electrons pass through the channels, they strike the channel walls which, in turn, release more electrons. By the time the electrons exit the microchannel plate, they have been multiplied thousands of times. The multiplied electrons then are accelerated onto a phosphor screen (like that in television.) When the electrons strike the screen, the phosphor glows in the same pattern as the light (photons) that originally entered the photocathode. The user then sees the brightened, intensified image--similar to someone watching a TV screen.
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