Types of Bushnell® Night Vision
Generation 1
Does not require an active infrared light source.
Instead it amplifies available ambient light.
Advanced Night Vision
Utilizes fiber optic bundles to eliminate distortion
and noise resulting in a high-resolution, high-contrast
premium image. Superior contrast allows you to
see dark subjects against darker backgrounds. Lower
distortion renders a
flatter, less rounded image with crisper details.
Night Vision Monocular
A Night Vision device for use with one eye.
Audio Monocular
Features direct sound amplification technology.
Headphones, boom microphone and recording port included.
Night Vision Binocular
Two complete sets of optics and image intensifiers
that are connected and share a common power supply.
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.
Bright Light Protection Circuit
An electronic circuit that turns the power to the
Night Vision device down or off when it is exposed
to bright light (such as automobile headlights).
This protects the image intensifier and extends
its life. The device will recover and resume normal
operation in 1–2 minutes.
Eyepiece Focus
Used to match your Night Vision scope or binocular
to your specific eyesight.
Infrared (I.R.) 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.
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.
Built-In Dual-Beam Infrared Illuminators
Allows you to adjust the I.R. from low to high power
according to your needs – high beam for
pin-point illumination, and low beam for wide-angle
illumination.
Image Intensifier or Intensifier Tube
The active component in a Night Vision system that amplifies light and presents
a usable image.
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
Converts 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. |
