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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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PVP 750mm Laser Night Vision 800m Human fishing


Andrew Peck asked Is it possible for a human to acquire night vision?

If someone was birthed in the dark, and raised in the dark until they were 20, would they adapt the dark and acquire night vision like Riddick? And if they did, would they need to wear goggles in the day time?

And got the following answer:

The type of night vision you are referring to only exists in the movies.
However, humans DO have a form of “Night Vision”. It takes about 45 minutes for your eyes to adjust from normal amounts of light (such as inside a building) to very little light (like when you go outside at night).
You can’t see perfectly clearly, nor can you see much detail or color. But, you can see well enough to see movement, the outline of a road, building, person, animal or even a gun from pretty far away.
If you are exposed to bright light, even for a Second, you will lose your night vision and have to wait for your eyes to readjust.
When I was in the Army, part of my training was “Night Fire Training”. We had to identify and shoot targets at night. Then locate camouflage targets in the dark. After that we had to drive with no lights on and no Night Vision Goggles.
We also had to do this stuff in Iraq. (If you have your lights on, it’s easier for the enemy to see you and shoot you).
I had no problems doing this stuff.

Note: Your night vision will only work if there is at least a little bit of light available, such as light from the stars and moon. In total darkness, you can’t see much of anything at all.

We also got to use night vision Goggles once in a while.

J asked Is there a video camera that has IR, night vision, and digital settings all combined in one?

I was wondering if there is a video camera that records digitally but also can record IR and night vision simultaneously — that is, if I look at this camera’s viewing screen, I can switch from digital, to IR, or to night vision at the flip of a switch.

Also, could this camera switch through these settings at will when previewing a recording?
So if I’m previewing a recording in night vision, can I flip a switch to IR and see the same recording in a different setting?

And got the following answer:

You’ll have enough trouble finding a camera that can shoot in both visible light and “night vision” (near infrared—just outside of human vision, but not able to be felt as heat).

Thermal cameras (those that can see heat) are typically purpose-built, since they require different sensors:

Considering all the expensive-sounding materials used for the sensor alone, it is safe to say that any camera that could take video of all three EMR regions would be too costly for regular people.

Person1001 asked Can you see the infrared a TV remote emits with Night Vision equipment?

Just curious. I know Night Vision works with infrared, so if were wearing some night vision equipment would I be able to see my remote sending a signal to my TV.

And got the following answer:

Definitely. It is infrared. Night vision equipment works by detecting light whose wavelength is longer than human vision can detect, and displaying it within the human visible spectrum. The infrared from your remote control is not qualitatively different from the infrared radiated by body heat.

Charmin asked How do humans have night vision (please explain thoroughly)?

I heard about night vision from a friend, but they didn’t explain it well. They said humans can have night vision, and I thought it sounded pretty cool. So, please explain what it is. Thanks. 🙂

And got the following answer:

Night vision is just like day vision, except for two things: in day vision there are three colors which combine to form trichromatic color vision; in night vision there is only one. The second is that while for day vision the protein(s), called -opsins, which are light sensitive, stay about the same from one minute to the next, while for night vision that protein breaks down and stops functioning in the presence of bright light, and then in the dark is slowly reconstituted, which is why night vision becomes more acute after spending some time in the dark.

The pigment protein that night vision uses is much more sensitive to light than those in color vision. It happens to peak in the yellow-green region, which is why red and blue are generally seen as very dark colors at night.