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INTRODUCTION
Night vision technology, literally allows one to see in the dark.
It is originally developed for military use .
Humans have poor night vision compared to many other animals.
With the proper night-vision equipment, we can see a person standing over 200 yards (183 m) away on a moonless, cloudy night.
TYPES OF NIGHT VISION
It is broadly classified into two types
Biological Night Vision
Molecules in the rods of the eye undergo a change in shape as light.
Molecules in the human rods is insensitive to the light.
Technical Night Vision
Image intensifier
Thermal imaging
WORKING OF TECHNICAL NIGHT VISION
Technical Night vision can work in two very different ways
Image Intensifier
Night vision amplifies light to achieve better vision .
A conventional lens, captures ambient light.
The gathered light is sent to the image-intensifier tube.
The light energy released electron from the cathode and accelerated.
These electrons enter micro channel plate and bounce off and generate more electron.
Thousands of other electrons to be released in each channel.
Original electrons collide with the channel,exciting atoms and causing other electrons.
New electrons collide with other atoms, creating a chain.
In image-intensifier tube, the electrons hit a screen.
The energy of the electrons release photons and create green image on the screen.
The green phosphor image is viewed through another lens.
NIGHT VISION DEVICES
Night vision devices are basically divided into three categories
SCOPES
They are monocular normally
handheld or mounted on a weapon.
GOGGLES
They are binocular and
worn on the head.
CAMERAS
Used for transmission or recording
of images mostly if the location is fixed.
GENERATIONS
Generation 0
The earliest (1950's) night vision products were based on image conversion, rather than intensification.
Generation 1
Vacuum Tube Technology
Full Moon Operation
Amplification: 1,000
Operating Life: 2,000 Hours
CONCLUSIONS
Today in the 21st century we have come a long way in the development of night vision technology, from the early 1940’s.
Night vision devices are basically designed for utmost defensive purposes but the application within the scientific or the civilian range is often prohibited by law.
In present scenario the applications of night vision technology is very essential to combat terrorism which is a major problem being faced by mankind.