Night Vision Technology

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  • Topic: Night vision device, Image intensifier, Infrared
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NIGHT VISION TECHNOLOGY

ABSTRACT

A night vision device (NVD) is an optical installment that allows images to be produced in levels of light approaching total darkness. They are most often used by the military and law enforcement agencies, but are available to civilian users. The term usually refers to a complete unit, including an image intensifier tube, a protective and generally water-resistant housing, and some type of mounting system. Many NVDs also include sacrificial lenses, IR illuminators, and telescopic lenses. NVDs are mounted appropriately for their specific purpose, with more general- purpose devices having more mounting options. For instance, the AN/PVS-14 is a monocular night vision device in use with the US military as well as by civilians. It may be mounted on the user's head for hands free use with a harness or helmet attachment, either as a monocular device, or in aligned pairs for binocular "night vision goggles" which provide a degree of depth perception as do optical binoculars. The AN/PVS-14 may also be attached to a rifle using a Pica tinny rail, in front of an existing telescopic or red dot sight, or attached to a single-lens reflex camera. Other systems, such as the AN/PVS-22 or Universal Night Sight, are designed for a specific purpose, integrating an image intensifier into, for example, a telescopic sight, resulting in a smaller and lighter but less versatile system.

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NIGHT VISION TECHNOLOGY
Presented BY
DEEPIKA.G.D NIGHT VISION TECHNOLOGY

Introduction
Types of NVT
Thermal Imaging
Image Enhancement
Performance Attributes
Technical characteristics
Equipments
Applications
Conclusion
References

Introduction
NVT allows us to see in the dark
Originally developed for military use
Now used for site security, surveillance as well as search and rescue Evolved from bulky optical instruments in lightweight goggles through the advancement of image intensification technology. Types of night vision

Categorized by generations
Each substantial change NVT establishes a new generation
Categorized into:
Generation-0
Generation-1
Generation-2
Generation-3
Generation-4

Generation-0
Created by US Army
Uses active infrared
A projection unit called IR illuminator is attached
Full moon operation
Use anode in conjunction with cathode to accelerate the electrons Problems “acceleration causes distortion of image as well as reduction of life of the tube Also, it was quickly duplicated by the hostile nations

Generation-1 (1960™s)
Uses passive infrared
Uses ambient light provided by the moon and the stars
Don™t require a source of projected infrared light
Don™t work well on cloudy or moonless nights
One quarter moon operation
Uses same image-intensifier tube technology as Generation-0
Same problems as faced by the Generation-0

Generation-2 (1970™s)
Offer improved resolution and performance over Generation-1 devices Considerably more reliable
Able to see in extreme low light conditions due to the addition of microchannel plate(MCP) to the image-intensifier tube The images are less distorted and brighter

Generation-3 (1990™s)
Currently used by the US Army
Better resolution and...
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