1. Night Vision By Arthur Wolff Justin Fromm

2. Night Vision Uses Rifle Mounted Scopes Binoculars Cameras Telescopes Goggles

3. Uses cont. These devices are used in many applications. Military Hunting Law Enforcement Recreation

4. Parts Objective Lens Image Intensifier Tube  Batteries  Photocathode  Microchannel Plate  Phosphors Screen Ocular Lens

5. Image Enhancement 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.

6. Image Enhancement cont. 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.

7. Image Enhancement again 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.