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Night Vision Explained
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Spy movies are often the first thing that comes to mind when people think about or discuss night vision technology. Do they actually work, or are they another form of moviemaking magic? In case you were wondering, the technology is very real and very effective. The standard set of night vision goggles will allow you to see a person standing 200 yards away on a cloudy, moonless night. Impressive, isnt it?

There are two different types of night vision technology. The first works on the principle of image enhancement. It works by collecting the minute amount of light contained in darkness, and amplifying it to the point where objects can be viewed. It even collects light from the lower end of the infrared light spectrum, which is generally imperceptible to the human eye.

The other way that night vision technology works is through a process known as thermal imaging. This process works by capturing the upper end of the infrared light spectrum. This part of the light spectrum is emitted in the form of heat, as opposed to light as we might recognize it. The warmer an object is the higher amount of this light is emitted.

There are some similar components in both night vision systems. Each of these systems is comprised of optics, some form of signal processing, and a viewing monitor. Image enhancement seems to be the prevailing technology contained in modern night vision systems. Both systems were developed, originally, for military use. In the United States, there are two classifications for night vision devices. The first is called MILSPEC, which refers to military specifications. The other is COMSPEC, which refers to commercial specifications.

This technology has been incorporated into a number of popular products, and put to use is many different ways. They are generally contained in three distinct categories; scopes, goggles, and cameras. Scopes are generally handheld or mounted on weapons, and are monocular. These are good for short-term viewing from a stationary position. Goggles are worn by the user and are binocular. As they are worn by the user, they are ideal for use over a longer period and during movement. Cameras are ideal for surveillance, as the images captured can be saved to a recording device or viewed on a remote monitor. This category also includes video imaging.

Night vision systems have come a long way since their early days of development. They are now used by law enforcement agencies and private investigators on a daily basis. They are also used by civilians for wildlife observation, security, surveillance, and personal entertainment. Night vision devices have become an integral part of the modern arsenal. Remember, not everything you see in the movies is make-believe.

This article was posted on November 14, 2005



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Original Source: http://www.articlecity.com/articles/gadgets_and_gizmos/article_205.shtml


Military Night Vision Goggles For Military With Waterproof Body And Mounting Mechanism By Abigail Taylor on December 04, 2010 0

Military night vision goggles are used by the army, navy and air forces of different countries, today such equipment is also used by the application of many law enforcement and security personnel (fire).

However, people can also buy night vision goggles for personal use, but usually do not have the same specifications you will find the military versions. Because the military night vision goggles have become an expected part of modern warfare is that they allow the user to see the pictures in the dark, which may not only be seen with the naked eye. Also the military versions have a special feature where they can focus on the user sees the image of each eye separately, which means that they are able to maintain depth perception when viewing images at any time.

How night vision works:

Most of the night vision goggles consist of image intensifier tubes, a waterproof body and mounting mechanism. Work in the near infrared bands to detect environmental light of the reflection is seen. image intensifier tubes for night vision goggles then extended to a weak light, using the photoelectric effect. Tube, the photons of light in to a flap that opens up the number of electrons. These electrons are then amplified Surge more electrons. A powerful electric field to pull electrons toward the screen mesh phosphor bronze, which produces light point of electron impact. This allows the screen to phosphorus produces a bright image.

Military night-vision goggles are generally used as artificial light during the military operations, and fight night. This increases the safety of soldiers, much as they can move without detected by their instruments of enlightenment.

The military uses two main types of night vision goggles:

* Image Intensifiers
Image intensifiers work by expanding the ambient light (flashlight enemy, moonlight, starlight) so you can see, as you would in the day. But the problem is that when a very bright light source appears, your picture overwhelmed. Their advantages are low weight, price, size and detailed images they bring, but consumes little electricity.

* Infrared Lenses
Infrared lenses to convert the infrared spectrum of visible light, but retail prices, which is low. He also has difficulty distinguishing between two objects that have the same level of heat (which is a question of who is the enemy and who is a friend). In some cases, night vision goggles can use infrared to see through walls.

These particular military night vision goggles take any light immediately in the vicinity of where they are, and expanded to increase the image of thousands of times using an image amplifier. night vision goggles work of the photoelectric effect, which is due to photons collide with the indicator plate. When photons hit the metal, then produces electrons which are then supplemented by further causing more electrons can be produced that ignites the screen in front of the user eyes. In some cases, all the user needs to illuminate the entire field of vision is a star high in the sky. You will often see these devices used to report on wars and the image we often see on television, where they used to be green.

Original Source: http://www.sooperarticles.com/news-society-articles/military-articles/military-night-vision-goggles-military-waterproof-body-mounting-mechanism-227377.html

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Q&A:

Jess asked Can you put those bright headlights that most new/fancy cars have into a older Honda?

I’ve got a 2002 Honda Civic with standard headlights. My night vision isn’t that great and I prefer driving cars with the bright new lights (what are they? halogen?) I want to know if its possible to put bright lights in my car, either by installing new bulbs or getting the Honda mechanics to do it. If its possible, are they/installation expensive?

And got the following answer:

They’re Xenon and you can get conversion kits you can install yourself.

THETRUTH313 asked My night vision is horrible while driving at night. How can I improve this?

Its been a scary experience for me while driving at night. It may sound crazy because I have been driving for years. But due to my work schedule, I rarely have to drive at night. Now my schedule changed and I have no choice. My night vision is terrible. My eyes seem to be more dry than they are during the day. And the lights on the other cars seem to look like a big blur. Any suggestions or reasons why this may be happening?

And got the following answer:

See an optometrist. You probably just need glasses for driving at night. I have glasses, but the only time I wear them is to drive at night or in the rain, they give me a headache & I don’t need them otherwise, but I don’t drive at night without them.

Old Gamer 56 asked Short of surgery, what can be done to improve my night vision while driving?

I’m 58, I’m near sighted and wear glasses. I have a new job that requires night driving. It almost seems that the more I drive at night, the better my night vision becomes, but I would like to improve it.
Input is appreciated, thank you.

And got the following answer:

Honestly, I don’t believe that’s something that can be corrected surgically. Getting your eyes used to it and making sure that you have adequate lighting on your vehicle are the best options. Of course, if you can get *better* than merely adeqate lighting, that would be a plus. My night vision really sucks so it’s something I struggle with myself.

Rose asked How can I improve my night vision?

I can see really well during the night, but when I drive at night my eyesight is really weak especially when I drive in areas that don’t have light. Is there anything I can do to naturally improve night vision? I know if I go to the eye doctor he is just going to want to prescribe me glasses. But I don’t need glasses since I can see very well during the day. I just need to know if there are any vitamins that I can take?

And got the following answer:

Carrots, bilberries and blueberries will actually improve your night vision temporarily so if you eat them every day you will get the best results as in http://au.search.yahoo.com/search;_ylt=A0oGkmb2_PlQIm0AqakL5gt.?p=%22night%20vision%22%20%2B%20carrots%20%2B%20bilberries%20%2B%20blueberries&fr2=sb-top&fr=ush-ans&vm=r&rd=r1