IGYWRK
The Wikipedia Enthusiast Communication Group ( Telegram : @wikipedia_zh_n , IRC : #wikipedia-en link , both connected) welcome everyone to join.
| [ Close ] |
Night-vision goggles [ edit ]
 | This entry does not list any references or sources . (May 4, 2011) |
 | This entry may contain original research or did not verify the contents . (November 12, 2012) |
Night Vision < night Vision Device , referred NVD >, also known as night vision goggles , strengthen technology device dark light through optical technologies, usually for military use. At present, it is also widely used in civil security.
table of Contents
[ hide ]- 1night vision instrument classification and principle
- 1.1LLL night vision
- 1.2Active Infrared Night Vision
- 1.3thermal imaging infrared instrument
- 1.4Laser Night Vision/Night Vision System
- 2spectral enhancement
- 3contrast enhancement
- 4night vision goggles maintenance
- 5See
- 6References
Night Vision Classification and Principles [ edit ]
Low light night vision instrument [ edit ]
Principle: similar to a television , the other is to enhance the luminosity of one end of the eyepiece. It can be said that it is the simplest night vision instrument.
Features: Weak but well-established light sources, such as stars, moonlight, lights, flares, etc., cannot be used in all black environments. However, because the principle is simple and the cost is low, and completely dark nights are not common, even if there are people can use the low light remedies. Therefore, since the 1960s, it has been used extensively by the US military during the Vietnam War and has become the most widely used night vision instrument.
Active infrared night vision instrument [ edit ]
Principle: Instrument outwardly emit an infrared light beam, irradiation target, and the target image reflected infrared image is converted into visible light so as to perform night observation, mainly for military night sighting, driving the vehicle, reconnaissance photography and the like.
Features: It is not limited by the illuminance. It can be observed under all black conditions with good results and low price. However, the observation distance is very close, and it is easy to be discovered by the other party during the observation period, thus exposing itself and it is rarely used militaryly. Today, it is mainly used for civilian use, and the cost is relatively cheaper.
Thermal imaging infrared instrument [ edit ]
Principle: Thermal imaging infrared instrument is based on the principle that all objects above absolute zero have infrared radiation , using the difference between target and background infrared radiation to find and identify the target instrument.
Characteristics: Due to the different infrared radiation intensity of various objects, humans, animals, vehicles, airplanes, etc. are clearly observed, and are not affected by obstacles such as smoke, fog and trees, and can work day and night. It is the most advanced night-vision observing equipment currently mastered by humans. However, due to its high cost, it can only be applied to the military at present. Although thermal imaging has a wide range of applications, power, underground pipelines, fire-fighting medical care, disaster relief, and industrial inspections have huge markets, it is still difficult to popularize.
Laser night vision/night vision system [ edit ]
Principle: The laser night vision instrument is developed from the laser rangefinder . It is similar to the infrared night vision instrument. It only has a longer observation distance and can reach several kilometers. It also solves the problems that are easily discovered by the other party. Because the beam is very narrow, it will only be seen at an angle. It is mainly used for monitoring.
Features: This type of product is widely used in border defense, military, public security, cultural relics, bases, oil fields, industrial and mining, factory areas, fisheries, forest farms, orchards and other places and areas. The device is suitable for all-weather, especially the ideal surveillance camera system for zero-light at night, with a monitoring distance ranging from a few meters to several kilometers. It is an excellent high-tech surveillance camera with excellent effect and quality in practical products of similar products. Product, the price is quite expensive. However, due to its various characteristics, the market is very popular.
Spectral enhancement [ edit ]
The human eye can only see limited visible light . Spectral enhancement can make people see the spectral band that is invisible to the human eye, thereby increasing the light source to see things. Because people can't see things does not mean that there is no other light source reflection (such as near- infrared rays or ultraviolet rays). Some animals use this principle to see a broader spectrum of light for nighttime activity.
Contrast enhancement [ edit ]
Sometimes the light is so weak that you can't see clearly or look far. At this time, the fuzzy outline is enhanced by noise filtering, and the human brain is combined into a reasonable image to make people see.
Night vision mirror maintenance [ edit ]
Using night-vision goggles under bright light is most detrimental to night-vision goggles. Although the night vision device will automatically cut off the circuit to protect the equipment when overloaded, exposure to strong light will shorten the useful life of the night vision device. Exposure to rain, fog, or even high humidity can also damage night vision equipment. For night use considerations, the night vision device is designed so that it can withstand short periods of intense light or wet conditions. There is a very precise vacuum tube in the night vision equipment , so be sure to take precautions against accidental impact and care. The method of clearing the night-vision lens is the same as cleaning the camera lens. The lens has an optical coating and can easily be scratched if it comes into contact with a rough material, or it can be penetrated by dust into the glass. It is usually not necessary to remove the lens to clean the interior. If you do not use it for a long time, it is best to remove the battery and store it in a cool, dry place.
See also [ edit ]
- Infrared imaging (FLIR)
References [ edit ]
- What are the night vision devices [ failed link ]
- Night Vision Common Types and Brands
- US D248860 - Night vision Pocketscope
- US 4707595 - Invisible light beam projector and night vision system
- US 4991183 - Target illuminators and systems initiative same
- US 6075644 - Panoramic night vision goggles
- U.S. Patent 7,173,237
- US 6158879 - Infra-red reflector and illumination system
- Histological study of choroidal melanocytes in animals with tapetum lucidum cellulosum (abstract)
Category :
- Military equipment
