Notes

The Physics of Night Vision Goggles
Physics is the branch of science in terms of the type and properties of matter and energy. The matter of physics includes anything having to do with heat, mechanics, light, sound, electricity, the structure of atoms, magnetism, and other radiation. A good example will be night vision goggles. Night vision goggle is really a device with electronic eyes that boost weak night-time vision into something more powerful. The light we are able to see is named visible light which is section of the electromagnetic spectrum.

There are other lights such as for example infrared and ultraviolet. The spectrum includes the gamma rays, x-rays, UV, visible light, infrared, microwave, and radio waves. Visible light includes violet, indigo, blue, green, blue, yellow, orange, and red which are sensitive to the human eyes. Lots of people who works with the military and police agencies use night vision technology. It can also be useful for hunting and watching animals during the night. The night vision goggles are green during the night as the photons that hit the lens at the front end of the goggles are carrying light of most colors. It is best for people to look at a green screen during the night than looking at a black and white screen.

There are two several types of night vision goggles are image enhancement (active) and thermal imaging (passive). There are five steps explaining just how night vision goggles work is.

First, the lens at the front is where in fact the dim light enters which is crafted from photons of all colors. Photons are the particles of light.

Second, once more info enter the goggles, it strikes a light-sensitive surface called a photocathode. Photocathode is a cathode that emits electrons when illuminated, causing a power 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, it hits a phosphor screen which is similar to the old fashion television.

Fifth, when there are more photons than originally entered the goggles, the screen becomes a brighter version than before. Thermal imaging is focused on a function of these temperature.

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