Glossary of Night Vision Terms
Night vision from A to Z
Automatic brightness control A feature that automatically reduces voltage to the micro-channel plate in order to keep within the proper limits the image intensifier's brightness, and to protect the tube as well.
Black spots Tiny spots within the night vision device tube, or visible spots on an image due to dirt buildup on the lens.
Bright-source protection
A function that lowers the amount of voltage to the photocathode when the night vision equipment encounters bright sources of light.
Diopter A unit of measurement that describes eye correction and a lens's refractive power.
Electro-optical transducer The system that directs and speeds up the photo-electronic flux and forms the electronic image.
Emission point A small point of light in the image area that remains even when all other light is blocked from the objective lens.
Eye relief The distance between a viewer's eyes and the furthest element of an eyepiece in order to end up with the best possible image area.
Gain The number of times a night vision device amplifies input of light.
Infrared Light that is radiated with wavelengths longer than those of red light.
Line pairs per millimeter The units that measure image intensifier resolution.
Lumen The unit that denotes the number of photons that can be perceived by the human eye every second.
Photosensitivity The capability of the photocathode material to emit an electrical response when encountering photons.
Recticle The round device found in night vision rifle scopes.
Resolution The capability of an image intensifier to differentiate between objects that are in close proximity to each other.
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