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[H1445]How To Night Vision

by Jonny Mcphil, Jon

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.

It's difficult to see in the dark. Unless there's some light peeking in through the window or from under a door, our vision is compromised. If we wait a little while, our night vision kicks in, allowing us to see somewhat better. It's not enough that we can read in the dark, but it should be enough to keep us from stumbling into furniture or tripping over the carpet. Sometimes though, our human night vision isn't enough and we need a little help.

That's where technology kicks in. Thanks to science we can use night vision to do all sorts of things. With the proper equipment we can hunt, take pictures or even fight wars in the dark. We can also perform surveillance and search and rescue missions.

Here's how it works: Your night vision product will take existing light and amplify it through an objective lens, which then focuses on an image intensifier. A photocathode located inside the intensifier converts the photon energy into electrons. The electrons in turn strike a phosphor screen creating a viewable image. In reality it looks like you're watching television on a green screen.

Atmospheric conditions can affect night vision. For instance, if it's cloudy, foggy, or overcast, night vision can be compromised. The clearer the night, the farther one will be able to see with night vision technology. It should also be noted that night vision shouldn't be magnified, as light is lost during the magnification process making it more difficult to see.

Night vision devices include:
-Cameras
-Binoculars
-Scopes for firearms
-Goggles

If you think that using a night vision device on a frequent basis might be harmful, you couldn't be more wrong. Night vision products are no more harmful than a television or movie screen. It doesn't emit radiation or other harmful rays and there's no reason for it to cause blindness.

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Jonny Mcphil has sinced written about articles on various topics from Computers and The Internet. . Jonny Mcphil's top article generates over 18100 views. to your Favourites.

James Hunt has sinced written about articles on various topics from History, Virtual Private Network and Mobile Phone Reviews. James Hunt has spent 15 years as a professional writer and researcher covering stories that cover a whole spectrum of interest.Read more at