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Night Vision
Jonny McPhil
Night Vision is an optical device consisting of high-quality
image intensifier tubes and optics that amplify existing light.
The Night Vision gives you the ability to see in conditions that
are too dark for a naked eye. Every Night Vision product has an
Infrared Illuminator. The Infrared Illuminator provides a light
source for the system to amplify the images. It can give you the
enhanced images in very low light conditions, such as caves,
where no ambient light is available for amplification of the
objects inside.
The working principle of a Night Vision is simple as well as
interesting. In very dark conditions, the available light, like
starlight, moonlight or infra-red light is gathered by the front
Objective Lens of the Night Vision. The objective lens then
transmits it through a set of optical lenses to the Electronic
Intensifier Tube (EIT.). The high levels of energy that is
produced by the device's intricate power supply rap out
electrons from the Photocathode Screen, located on the front of
the Electronic Intensifier Tube.
The same energy from the EIT generates a highly static field,
pushing the electrons to the Phosphorescent Screen, which is a
very sensitive layer at the back of the EIT. These electrons
strike the Phosphorescent Screen with immense speed and allow
it to illuminate. This whole procedure produces an image, which
is then magnified by the Ocular Lens located at the back of the
Night Vision. By looking through the ocular lens of the Night
Vision, you will see the image as you see in a normal optical
device.
The image that you get in the Night Vision will not be clear at
the first instance. It will appear in an indistinct green color.
Finally, the Ocular Lens gives the adjustment that is fit for
your particular eyesight. The Objective Lens of a Night Vision
gives you the choice of adjusting the focus according to the
distance of the object you are viewing.
There are different types of Night Vision glasses. Some of the
popular Night Vision glasses are Generation1, Advanced Night
Vision, Night Vision Monocular, Night Vision Binocular and the
Audio Monocular. The Generation 1 doesn’t need an active infra
red light source. Instead it amplifies the existing light
several thousand times to let you see in the dark. It is
currently the most popular type of Night Vision in the world.
These units provide a bright and sharp image at a low cost,
which is perfect, for all your adventures, exploration and
voyages.
The other versions of Night Vision are used for specific
purposes only. For instance, the Monocular and the Binocular
with different lens powers are used for close range viewing and
short range viewing. Night Visions of various types are put into
use for fishing, boating, wild life observation and security
purposes. Unlike Generation 1, the other types of Night Visions
are pretty expensive.
Author provides great information at
http://www.anightvision.com -
Night Vision resources.
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