How Do Night Vision Equipment Work?
Night vision equipment refers to electronic-cum-optical devices which work by amplifying or intensifying whatever light there is in existence rather than depending on a source of light in-built into them. They are sensitive to a wide spectrum of light, which ranges from visible to infrared. The light that is available at the infrared part of the spectrum can be increased by an accessory illuminator, which casts a light beam that is invisible to the human eye. Hence when viewing something with a night vision device, you do not look through it. Instead, you are viewing an electronic image that is amplified on a phosphor screen. The light enters via an objective lens and then falls upon a photo cathode, which has a high energy charge via the power supply. This charge of energy accelerates through a vacuum that exists in the intensifier and falls upon a phosphor screen, similar to a TV screen, which is the place where the image is focused. The image is magnified by the eyepiece. The phosph
