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Title: The Human Eye and Night Vision Goggles

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Subject: Technology
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Date: August 20, 2002
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Length: 4 / 1044
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With NVG's, everything on the ground can be clearly seen from an altitude of 1,500 feet above ground, and up. In using the same camera analogy in describing the eyes, we can use that of a video camera to describe how Night Vision Goggles (NVG's) operate...

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When we use a video camera, we are not looking at an image directly, but are viewing an electronic image displayed on a screen. The NVG senses ambient light (sometimes as faint as starlight or low-level moonlight), processes it through an image intensifier called a photocathode, magnifies the intensity of the light some 1,000 to 3,000 times, and then projects the image onto a phosphor screen that in turn creates a monochrome, video-like image, which the user sees through the eyepieces...

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