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Night Vision Explained

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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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.

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titties mcgee asked Where can you buy night vision monoculars in melbourne?

i need to know where to find night vision or (preferably) thermal imaging goggles cheap soon in melbourne, victoria! help?

And got the following answer:

You can find both for sale on eBay. Night vision isn’t too expensive but wait till you see what thermal imaging sells at. No such animal as “cheap” thermal imaging.

I hope this helps and you can find it useful

franch asked Where is a good place to buy a cheap Night Vision monocular in Ft Lauderdale?

I checked that model and is very cheap and efficient, I’m Interesting in that, but I want go to store by try on.×50-nv-monocular-yk24042b-free-shipping-p-9.html


And got the following answer:

The best place to buy is, they carry several models and let those who purchased them rate them. They ship quicly and are price competitive with anyone else. I have a nightowl (green tube) unit and a yukon ccd unit which can be used in daylight as a 5x binocular. ATN makes a great unit but they are pricey. Good luck finding one you like

George asked Does Bushnell make good night vision binoculars or monoculars?

Is their perhaps another company i should be looking at. There is alot of wildlife in my fathers backyard and i would like to buy him one for his birthday so he can see the animals at night.

And got the following answer:

they make 5 I believe. The equinox, stealthview, stealthview II, night watch and nightvision. They are not the top brand by any means for night vision but for what your intentions are they would be fine up to about 200 or so yards. They are the cheaper of the brands around 650 to start.

Lp asked Here’s a question to all military and law enforcement, about night vison…?

I am an avid collector of civilized military equipment. Even though most of this amounts to the simple things such as ruck sack, camel pack, etc. I have been looking to get some gen 1/gen 2 night vision. preferably monocular, but its not set in stone. though this is mainly more of an adulthood toy or for recreational use only, I still want the best for my buck. Being night vision, you can walk in the store and look at it but you cant try it out. Obviously because 1 it would ruin the mechanics, and 2 the lights are always on. Having never served in the military or law enforcement, i don’t know much about nv and the information on the net, doest really go into detail about blurriness, stability, and durability. so i figured i would ask the experts. Oh yeah, i forgot to mention, I would really like to get one with a head mount… Thought that would be pretty cool to. Anyway your comments are greatly appreciated, THANK YOU FOR SERVING, and God bless..


And got the following answer:

One of my additional duties was NVG instructor and I was certified in that. A couple of things I would recommend is not to buy any NVG without testing it out first. One of the big things especially with the generation 1/2s is that the micro chip in them burns out after about 1000 hours of use and needs to be replaced and that chip is not cheap. Optically they are alright for observing something or observing game but depth perception with them is off and so I would not recommend anything more than that with them like walking, running, or driving. Most of what you see used now is generation 3/4s which have about double the life for the microchip for ground troops and less problem with depth perception but that problem is not corrected entirely for distances closer than 4-6 feet.

The newer, aeronautic versions are excellent and have largely corrected the depth perception problem which is why you can do things like pilot a chopper or fly an aircraft. Those versions are very expensive, costing several thousand dollars per unit and much more compact but largely unavailable to the public.

So if you just want them for show and to add to your collection of military stuff then buy the cheapest but if you think you might want to take them out and play with them some evening then don’t buy them without checking them out first and that they work. They also take a double A battery. One other thing you need to be aware of is some studies have shown that they can cause eye problems for some people who use them for extended periods of time over time.