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Infrared imaging works by detecting radiation that objects give out.  Many quality night vision products incorporate infrared imaging systems into their optics, allowing people to see things that the human eye cannot register unaided. 

All scenes “glow” in infrared, whether or not light is present.   Some infrared imagers can detect otherwise invisible dangers, such as buried weapons.   Infrared imagers are also used in forensics, since they can reveal differences in chemical composition that are not visible in ordinary.

Night vision equipment work in the near-infrared band at a wavelength of about 1 micrometer. Unlike thermal imaging systems, which operate in complete darkness by detecting heat radiation signatures in infrared wavelengths beyond 3 micrometers, night vision works in near darkness by detecting ordinary ambient light, usually from the moon and stars, that is reflected by objects in the scene being viewed. Night vision contains an image intensifier tube that uses the photoelectric effect to amplify very weak light. As each photon of incoming light collides with a detector plate inside the intensifier tube, the plate ejects several electrons that are further amplified into a cascade of electrons. These electrons are accelerated by a strong electric field towards a phosphor screen which emits light at the point of impact of the electrons. A bright image is thus formed on the phosphor screen. Outdoor environments that are illuminated only by star light can be easily viewed using night vision devices.

Most night vision devices do not detect color information, and hence a monochromatic phosphor screen is sufficient. A green phosphor display is generally used because the human eye is most sensitive to the color green, which falls in the middle of the visible light spectrum.

For anyone who’s shopped for night vision equipment, you know it can be pretty expensive.  With gas prices what they are, finding the extra money for something like a night vision combo package can be more challenging than ever.  Thankfully, though, there’s a great alternative to surplus suppliers and overpriced hunting stores.  ScoutMasterPro has helped me find some of the best deals anywhere on top-notch night vision equipment and accessories.

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