| |
The Way Night Vision Works
By Shawn Davis
Most people are familiar with the concept of night vision. After all, it is seen in countless action and spy movies. However, the truth is that night vision is more than a fantastical concept; it is reality. And with goggles, night scopes, binoculars and monoculars, it is possible to see on a moonless, cloudless night. In fact, the technology is so advanced that you can see a person standing more than 200 yards away. That's twice the length of a football field! The remarkable feat of human sight at night is accomplished one of two ways: image enhancement or thermal imaging.
Image enhancement is a night vision technique that collects tiny amounts of light that may not be perceptible to the human eye. These are the smallest glimmers of light, sometimes even on the lower end of the infrared spectrum, that are discovered by the device in use. The points of light are than amplified by the device to a point that allows the object or person to be seen easily.
The other way night vision works is by thermal imaging. This is technology that works exclusively in the upper portion of infrared light. Rather than gathering reflected light, this is heat that is given off by objects or people. This is known as thermal infrared, and it occupies the largest amount of space as part of the infrared spectrum (which is at the lower end of the light spectrum, below what is detectible by the human eye). This means that there is a great deal of wavelengths that can be detected by the proper devices. Because thermal imaging works by putting the heat coming from objects in visible form, it is to be expected that some objects will appear clearer than others. Humans, for example, emit more heat than a tree, and so a tree will not be as clear.
Night vision products make excellent additions to any surveillance collection, and they can be very helpful in locating objects or people in dark places. You will pay in a price range from under $300 to more than $15,000, depending on features, accuracy, and purpose of the accessories you choose to aid your night vision.
(c) 2005 Copyright www.spyassociates.com. This article is about: Night Vision
About the Author
To learn more about Spy and Surveillance Products visit http://www.spyassociates.com Read other related articles at http://spyassociates.blogspot.com/
Article Source: http://www.simplysearch4it.com/article/11783.html
| If you wish to add the above article to your website or newsletters then please include the "Article Source: http://www.simplysearch4it.com/article/11783.html" as shown above and make it hyperlinked. |
| Some other articles by Shawn Davis | Detecting Spy Cams
You know that using spy cams can be very useful for surveillance. But if you use spy cams, isn't it ...
Avoiding Phone Taps
When you want to avoid phone taps on your line, one of the things you need to do is get a bug sweeper. These ...
Spy Bugs to Listen In
There are many different spy bugs that can be used to listen in on conversations. These can be bugs that you plant at a home, or listening devices that you wear on your person (or ...
Protect Your Home with a Spy Cam
Most of the threats to your home and your valuables come from within. When you use a spy cam in your home, then you get a better idea of what is really going on ...
High Tech Spy Surveillance Equipment
For the consummate professional, nothing less than the best spy surveillance equipment is acceptable. The best private investigators and bounty hunters never skimp when it comes to their ...
Types of Phone Bugs
Everyone loves learning about phone bugs. This is because they are among the most popular covert eavesdropping devices. These listening devices can allow someone to relatively easily listen in on ...
|
|
| |
|
|
|
