Advantages and disadvantages of night vision devices

Night vision has its strengths and weaknesses. Through both areas, I try to get more benefits than disadvantages. Being able to see in the dark is of utmost concern for everyone. As you read, I spend most of my time in this area because night vision was mainly for the army.


Engineers and scientists at the United States Telecom Electronics (CECOM) Night Vision and Electronic Sensors Division (NVESD) discover ways to capture electromagnetic radiation available outside the human eye and develop devices to allow American soldiers Fight day and night and play "My Night". Night vision equipment allows night fighters to see, control, and fire at night or during periods of limited visibility. The military used two types of night vision devices: image intensifiers and heaters. Image enhancement devices rely on light amplification and require some light. These devices can amplify available light by 2000 to 5000 times. Thermal Predictive Infrared Detector (FLIR)-Sometimes called a "sensor"-detects the temperature difference between an object and its surroundings. The FLIR system is installed on some combat vehicles and helicopters.
Night-vision goggles are electro-optic devices that improve (or amplify) existing light rather than relying on its own light source. Image intensifiers capture ambient light, electronically amplify it thousands of times, and show soldiers the battlefield with fluorescent screens such as night vision goggles. This ambient light comes from the stars, moon, or sky shining from distant artificial light sources, such as cities. The device is sensitive to a wide range of light from visible light to infrared (invisible). Instead of looking at night-vision goggles, the user sees an enhanced electronic image of the phosphor screen.
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The light hits the night vision through the lens and hits the photocathode driven by a highly charged power supply. The energy charge is accelerated by the vacuum inside the amplifier, hits the fluorescent tube and focuses the image. The eyepiece magnifies the image.
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Soldiers can only perform combat operations without an active light source and image intensifier. The main advantages of image intensifiers such as night vision devices are small size, light weight, low energy consumption and low cost. These features have allowed the U.S. Army to purchase image intensifying glasses for individual military use with headgear. Research and development of image intensifiers in the region of longer wave spectral sensitivity, higher sensitivity, higher field of view, and higher resolution continue.
Looking through night vision is very similar to looking through a tunnel. Normal field of view is almost 190 degrees, but at night vision drops to 40 degrees. There is no side or "side" view you are used to, and you often see danger. To get there, you need to turn your head to look for dangers on both sides that are not visible in a narrow view. Generally, binocular signals (binocular vision) are used to estimate the distance and depth of the subject. However, night vision devices primarily use one eye (monocular), which can lead to real problems. For example, if you are using NVD and are displaying two objects of different sizes side by side, the larger object will be displayed nearby. When looking at overlapping objects with night vision equipment, objects in front of them become "visible" closer. Also, some of the objects checked with night vision goggles seem to be farther than they actually are. This is because the loss of detail tends to be related to distance. Light sources that are not part of the ground, on the other hand, may appear closer than they actually are. It is important to note that with these potential problems, night vision goggles tend to overestimate distance and underestimate depth.
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Your eyes need time to adapt from day to night. Therefore, you hardly know when you start a dark movie during the day-your eyes need time to get used to the darkness. The same goes for night vision goggles. If you remove the night glasses, it takes time for the eyes to darken. The time required depends on how long you wear night vision goggles. Most people will be about 75% darker within 30 seconds of removing the glasses. This is especially important if you are wearing night vision goggles. Raise and then lower in effect in front of you.