Night Vision: Image Intensification Technology
NIGHT VISION TECHNOLOGY N A Badrinath “A Military that can see at night will always enjoy distinct advantage over an opponent that can’t.” The first thing which comes to our mind when we hear about Night Vision is a Hollywood spy or action movie. We wonder whether it actually happens; answer is yes, with a proper night vision equipment human eye can see objects which are 200 M away even on a cloudy moon less night. Night vision signifies the ability of human eye to see in dark. The capability which is possessed by Owls and Cats. Thanks to science and technology that the same has become possible to human eye. Night vision device was first time developed in early 1930s due to innovation by Russian – American scientist Vladimir Zovorikin. …show more content…
Image intensification technology converts invisible light of the image to the visible light so that the object which otherwise cannot be seen by the naked eye can be sent and captured. System consists of Photo Cathode Plate (PCP), Micro Channel Plate (MCP) and a Phosphor plate to intensify and project the …show more content…
MCP has thousands of micro channels and is made of Fibre Technology. Electrons hitting the MCP are joined with thousands of similar electrons which hits the phosphor screen. These electrons cause phosphor atoms to reach the exited state and release photons. As the electrons maintain their position in relation to the channel in which they enter, photons create a clear image on the screen. Image is seen through another lens which allow magnification and focusing. Table below shows the development of Night Vision Device (NVD) since the time of its inception. Gen 0 Used active infrared. Projection unit, called an IR Illuminator was attached to the NVD. The unit projected a beam of near-infrared light, similar to the beam of a normal flashlight. Invisible to the naked eye, this beam which reflected off objects and bounced back to the lens of the NVD. The problem with that approach was that the acceleration of electrons distorted the image and decreased the life of the tube. Gen 1 Used passive infrared. NVDs used ambient light of moon and stars to augment the normal amounts of reflected infrared in the
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