This entry was posted on Tuesday, July 1st, 2008 at 4:14 pm and is filed under How Night Vision Works, Night Vision Equipment, Night Vision Monoculars. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
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.
July 20th, 2008 at 5:59 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
July 20th, 2008 at 6:00 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
July 20th, 2008 at 6:01 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
July 20th, 2008 at 6:01 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
July 20th, 2008 at 6:02 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
July 20th, 2008 at 6:02 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
July 20th, 2008 at 6:03 pm
How Night Vision Works | Scout Master…
Enjoying the outdoors can be so much fun when you have these night vision gears that you can get in this site. Its co cool having one of these things that will help you see the beauty of the nature at night….
August 24th, 2008 at 11:47 pm
How Night Vision Works | Scout Master…
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August 24th, 2008 at 11:49 pm
How Night Vision Works | Scout Master…
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August 24th, 2008 at 11:50 pm
How Night Vision Works | Scout Master…
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August 25th, 2008 at 12:38 am
How Night Vision Works | Scout Master…
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August 25th, 2008 at 12:41 am
How Night Vision Works | Scout Master…
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