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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

Shawn Davis

To learn more about Spy and Surveillance Products visit http://www.spyassociates.com . Read other related articles at http://spyassociates.blogspot.com/.

This article was posted on September 30, 2005

 


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 Top 3 Tips For Buying An LCD TV
 by: Amy Metz

I want a larger screen and so do you. There is absolutely no reason for this wanting except for the feeling of power that a large screen gives you. I have no idea why it is, but we all seem to want a larger screen for our TVs these days. The question is, how to get a good deal on an LCD TV without paying a fortune. Let’s give you our top 3 tips on buying an LCD TV.

1)Don’t buy a used one if you don’t have to. The funny thing about these TVs is that their prices drop significantly every month and that if you just wait a little longer, the price you’ll pay for a new TV is probably not going to be too far off from the price that you are going to pay for a used one. A little patience might actually save you some dollars here.

2)Compare features, not just prices. One of our favorite places to go to compare prices on LCD Tvs is ConsumerReports.org. Consumer Reports was rating different items way before the internet even become popular. Remember buying your first real car? I do. And I went straight to Consumer Reports to find out that the Honda Accord was the car to buy (and still is according to CR). Shopping for a high end LCD Tv shouldn’t be any different than shopping for a new car. All the resources are at your disposal, so give it a try. I’m sure you can find some gems of information at CR regarding your LCD Tv purchase.

3)HD is coming, don’t miss out. High definition television has allegedly been “right around the corner” for years. Well, that time may finally have arrived. Some LCD Tvs come HD ready and some do not. Make sure your new LCD TV supports HD so that when it is finally popularized, you can watch the programs utilizing this latest technology.

And by the way, why would someone want to buy an LCD TV over a “Plasma”. And what is a plasma? Are they different than LCDs? Basically yes. The big difference is that they use different technologies to deliver a picture. Both have pros and cons. However, both deliver a large screen experience to the user.

 

About The Author
 

Amy Metz is a contributing author for http://www.lcdtvme.com. We feature all sort of articles on lcd tvs at LCDTvme.com. Don't buy an LCD TV without reading up on them first.

 

 

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