Angle or Field of View: The measure of the angle defining the field visible through the Night Vision system at a distance of 100 yards.
Eyepiece Focus: Used to match your Night Vision scope or binocular to your specific eyesight.
Image Intensifier or Intensifier Tube: The active component in a Night Vision system that amplifies light and presents a usable image.
Infrared (IR) Illuminator: Provides a light source for the system to amplify, yielding enhanced images in very low-light conditions such as caves, where no ambient light is available for amplification.
Built-In Dual-Beam Infrared Illuminators: Allows you to adjust the IR from low to high power according to your needs – high beam for long range illumination, and low beam for wide-angle illumination.
Objective Lens: Collects all available light and focuses it on the image intensifier. It also provides image magnification. The best objective lenses have low magnification (5x or less), are high speed (f2 or faster) and are coated for maximum efficiency in the near-infrared bandwidth.
Phosphor Screen: Positioned at the back of the intensifier tube, the green phosphor screen renders a visible Night Vision image. The human eye is most sensitive to green contrasts.
Photocathode: Coverts light (photon energy) into electrons (electrical energy), which are then amplified in the intensifier. The objective lens focuses available light on the photo-electric surface of the photocathode, which is excited and passes electrons within the tube.
Resolution: A measure of the ability to render and display a detailed image. Image-intensifier resolution remains constant and is expressed as the maximum number of line pairs per millimeter (lp/mm) that can be discerned when a black-and-white stripe pattern is focused on the photocathode. |
