Hi, this is Wayne again with a topic “How Does Night Vision Work?”.
There aren’t actually too many more things more difficult than trying to see your surroundings in a pitch-black room, and while you can always feel your way around and hope that you don’t trip ahead first into the toilet, there are times that actually being able to see in The dark is a must, fortunately, night vision isn’t just a thing in your favorite first-person shooter. It’S present in everything, from surveillance, cameras to military periscopes to ordinary smartphones. In fact, part of the reason night-vision has so many applications is because it’s not just one specific piece of technology. Rather, it comes in several different forms that can be deployed depending on use case, but what many people think of when they hear the words night vision is something called image, intensification or image enhancement. This is that stereotypical green form of night vision that you might associate with the military or what you see in action movies, speaking of which that green color is used on purpose, because your eyes are more sensitive to green than other colors. Image. Enhancement works by being able to detect low levels of light and then amplify it when photons, the tiny particles that make up light enter an image enhancer, they first hit a special layer, called a photo cathode which releases electrons. These electrons then hit a second layer called a microchannel plate which multiplies the electrons before they hit the phosphorus green. Why are these things also? Epic? Well, that then converts them back into light, because there are now so many more electrons you get a brighter image, so you’ll have an easier time getting into someone’s base and killing all their nudes but hold on a second.
What if there isn’t enough light for thermal enhancers to see at all? This is where thermal imaging comes in. Instead of detecting light, thermal cameras detect heat coming off of different objects, since they can see infrared light, you see heat causes things to emit photons in the infrared or IR spectrum, and although humans can’t see infrared light, these special cameras take advantage of it. In a number different ways: hey our cameras, produce images called thermo grams, which sometimes look rainbow-colored where the different colors represent different temperatures. Therma grams are useful for everything, seemingly from medicine, to construction, but they’re, very specifically handy for night-vision, since it’s really easy to pick out different objects such as people or animals, due to their different colors standing out on the screen.
Thermal cameras often can’t achieve the same level of detail as their image enhancing counterparts, but they have a big advantage of being able to pick out things that might be hard to see with a normal image. Enhancer, for example, a firefighter trying to locate people that need to be rescued in a burning building, a hunter picking out prey deep in the woods hiding behind foliage or cops trying to locate that hiding fugitive and speaking of thermal imaging. Some cameras can even create their own infrared light in a process called active illumination where they actually light up their surroundings with IR radiation, because this additional infrared energy reflects off of whatever the cameras pointed at this strategy can result in much higher resolution images great for Things like surveillance cameras, where you really want to get a positive ID on that perp that tried to steal your slushie machine.
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