What should we understand by Night Vision??? : Explanation
This review is all about the explanation of night vision, people often ask that what is night vision? , can we see in the dark ? , what are the applications of Night Vision ? etc. So today i will present the Explanation of Night Vision in simple words so that everyone can understand.
As we know that it is very difficult to see in the dark at night , trying to see your surroundings in a pitch-black room and all you always feel your way around and hope that you don't trip your head into something or bump into something, there are times that actually being able to see in the dark is a must.
Night Vision:
Fortunately night vision isn't just a thing in your favorite game like call of duty or something but 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 word "night vision" is something called "image intensification" or "image enhancements" this is that stereotypical green form of night vision that you might have seen in the military games or action movies.
Speaking of which that green color is used on purpose because human 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.
Working of image enhancement:
When photons the tiny particles that make up light enter an image enhancer they first hit a special layer called a photocathode which releases electrons these electrons then hit a second layer called a microchannel plate, which multiplies the electrons before they hit the phosphorous screen where they , then converts them back into light because there are now so many more electrons you get a Brighter Image.
Thermal Imaging:
But hold on a second, what if there isn't enough light for the thermal enhancers to see at all this is were 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 thing's 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 of different ways.
There are cameras that produce images called "thermograms" which sometimes look rainbow colored where the different colors represent different temperatures. Thermograms 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 color 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 of firefighter trying to locate people that need to be rescued in a burning building, a hunter picking a prey deep in the woods hiding behind Foliage, or cops trying to locate that hiding suspect.
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 catch a thief.
So this was Explanation of Night Vision . I hope you guys this review.
