When thinking of these types of goggles you may start to think of video games or action movies but in reality these goggles are operating on scientific principles and use real technology. They are often used by law enforcement and military organizations but are also available to civilians. When wearing night vision goggles you can see as far away as two hundred feet son a cloudy moonless night.
There are two methods used to enhance sight, which are:
• Thermal imaging-this method is able to capture the heat of the object. The warmer the object is the brighter the colors. It is useful if you are looking for animals or humans because non-breathing material like rocks and trees do not show up very well.
• Image enhancement-this method concentrates on particles of light that are too low or too small in the color spectrum for humans to pick up. One benefit with image enhancement is that it can allow for easy identification of an object unlike thermal imaging. The green tint that appears in the night vision images is a result of this type of technology. When the image pages through the lenses they reach a screen that is coated in phosphors. It glows when it is activated by electrons. The phosphors are tinted green intentionally because the human eye can differentiate between and identify shades of green better than any other color.
The first night vision goggles were used in the Korean War and World War II. They were invented by the United States Army. A similar technology was invented by the Nazi forces but was used mainly for a tank accessory. The American goggles were used by snipers. The need to use an infrared illumination source was eliminated by the later models, which instead use ambient light. The current army-issued goggles are highly advanced. They can magnify light thirty thousand to fifty thousand times.
Using night vision goggles to create an effect is a favorite thing to do in film making. These effect frequently appear in loves for comic effect and for their traditional used as sniper or military aids. Some of these famous movies include Blackhawk Down, Patriot Games, and Cats and Dogs.
Some countries have laws that dictate which form of night vision goggles citizens are allowed to use commercially. The prices for these specialty goggles vary and depend on the general of technology that is used. A simple device can cost between one hundred fifty to two hundred dollars. Some are so advanced that they can cost more than ten thousand dollars.
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