Night Vision | Thermal Vision Explained!!!
Hello guys! Welcome to technstuff.in, so today we are going to discuss about the night vision devices and thermal vision devises and how they work. So what comes first in mind when we hear night vision or thermal vision is the action movie scenes or army fighting enemy in low light building or in moonless night. There is two possibilities to identify the object or person in low light or in dark – Thermal Vision and Night Vision. Human eyes are not capable to see in dark like many animals. The human eye don’t have the reflecting tissue called Tapetum lucidum, present in the eyes of owls, dogs, cats, horses and some underwater animals. You have seen the shining eyes of theses animals, that is because of Tapetum lucidum. The best thermal vision animals includes snakes. Eyes of the snakes are provided with thermal sense.
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Basically we can use Night Vision goggles or binoculars to view in low light. Some popular uses are night vision for hunting, wildlife observation, home security, and several others. Equipment like goggles, binoculars, monocular, dedicated rifle Multipurpose Viewers uses night vision mechanism. These devices have variations such as dual image tube binoculars, long range binoculars, single eye goggles, both eyes goggles and so on. Now when i say Night Vision, some light must be present to see something, in zero percent light you can’t use Night Vision Devices. So basically one can use Night Vision Device in Moon light, Star Light or Infra-red Light.
Night Vision Device consist of several components: Front lens, Photo Cathode, Phosphorus Screen and Eyepiece. Night Vision Device collects the light which can be moonlight, infra-red light or it can be starlight at and through Front Lens. Basically the light is the huge collection of photons. The light gathered at Front Lens goes into Photo Cathode Tube. The work of Photo Cathode Tube is to convert Photons of light into electrons. Through chemical and electrical process these electrons are amplified into large numbers. After then these electrons are passed from Phosphorus Screen for getting visible light back. The screen converts the electrons into photons and the visible image can be seen through the Eyepiece. As the advantage of using night vision it gives clear image but you can’t see the colorful images, yeah! that is the limitations of the both thermal and night vision devices. The image will be a clear green amplified re-creation of the scene you were observing.
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We have seen how Night Vision can be used in case we have some light. So here comes thermal vision where one can identify objects even in complete darkness. Thermal Vision Devices makes it possible to see the unseen. Thermal vision mechanism works on the infrared energy. The humans, animals and all other objects either natural or man made emits the energy that is infra-red energy. These objects emits the infra-red energy as the heat. First developed for military purposes, thermal imaging has since been adopted by law enforcement, fire and rescue teams and security professionals. Thermal imaging cameras are commonly referred to as “FLIR” (“forward-looking infrared”).
Different objects emits different amount of energy, some object may be hot some of them may be cool. The Thermal Devices detects this energy emitted from the objects. The thermal heat or say infrared energy is focused from scene by the Optics Lens and it is then focused onto Infrared Detector. The thermal image processing is done by electronic sensors. The processed image then can be presented on the electronic screen or the eyepiece of the goggles. Unlike traditional most night-vision equipment which uses image-enhancement technology, thermal imaging is great for detecting people or working in near-absolute darkness with no ambient lighting.
I hope you guys would be cleared regarding Night And Thermal Vision mechanisms. Please comment in case any suggestion or query. Hope you liked the article, you can also find more interesting articles here so don’t forget to bookmark technstuff.in.