Night VisionNight Vision

By

Arthur Wolff

Justin Fromm

Night Vision UsesNight Vision Uses

• Rifle Mounted Scopes

• Binoculars

• Cameras

• Telescopes

• Goggles

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Uses cont.Uses cont.

• These devices are used in many applications.

• Military

• Hunting

• Law Enforcement

• Recreation

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PartsParts

• Objective Lens

• Image Intensifier Tube Batteries Photocathode Microchannel Plate Phosphors Screen

• Ocular Lens

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• The objective lens collects ambient and lower spectrum infrared light.

• The light is sent to the intensifier tube

• The light passes through the photocathode, this coverts the photons into electrons

• Electrons then are accelerated down the hole of the microchannel plate.

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• The electrons are multiplied by the thousands do to a process called “cascaded secondary emission”

• “Cascaded secondary emission” is a process when the electrons hit the walls of the channel exciting the atoms there which in turn release more electrons, and those electrons in turn do the same thing.

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• The electrons then exit the channel and hit a screen coated in phosphors. It is because of these phosphors that we get the green image associated Night Vision

• This screen converts the electrons back into photons.

• These photons move on through the ocular lens were they can be viewed.

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