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The Physics of Night Vision Goggles

Physics is the branch of science that deals with the nature and properties of matter and energy. The subject of physics includes everything to do with heat, mechanics, light, sound, electricity, structure of atoms, magnetism and other radiations. A good example would be night vision goggles. Night vision goggles are a device with electronic eyes that enhance weak night vision into something more powerful. The light we can see is called visible light which is part of the electromagnetic spectrum.

There are other lights such as infrared and ultraviolet. The spectrum includes gamma rays, x-rays, UV, visible light, infrared, microwaves, and radio waves. Visible light consists of violet, indigo, blue, green, blue, yellow, orange and red which are sensitive to human eyes. Many people who work with the military and law enforcement agencies use night vision technology. It can also be used for hunting and tracking animals at night. Night vision goggles are green at night because photons hitting the lens on the front of the goggles carry light of all colors. It is better for people to look at a green screen at night than a black and white screen.

There are two different types of night vision goggles they are image enhancement (active) and thermal imaging (passive). There are five steps that explain how night vision goggles work.

First, the lens on the front is where the dim light made up of photons of all colors enters. Photons are the particles of light.

Second, when photons enter the glasses, they hit a light-sensitive surface called a photocathode. A photocathode is a cathode that emits electrons when illuminated, causing an electric current. Electrons are subatomic particles that carry electricity around a circuit.

Third, the electrons are amplified by a photomultiplier which is some kind of photoelectric cell.

Fourth, after the electrons leave the photomultiplier, they hit a phosphor screen that is similar to the old television.

Fifth, when there are more photons than were originally introduced into the glasses, the screen becomes brighter than before. Thermal imaging depends on their temperature.

For example, the hotter a certain object is, the more radiation it emits. There are two different types of thermal imaging detectors, which are the cooled infrared camera and the uncooled infrared detector camera. The difference between the two is only the temperature and is it stabilized or not.

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