Night Vison Technology

8/14/2019 Night Vison Technology

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INTRODUCTION: Can we actually see in the dark? Do

these things really work? The answer is yes.

Literally allows one to see in the dark Originally developed for military use

Evolved from bulky optical instruments tolight weight gogglesWith proper night vision equipment, we can

visualize anything at a distance over 200yards on a moon-less cloudy night


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IMAGE ENHANCEMENT:

Employs collecting & amplifying lowerportion of infrared light spectrum

Employs special tube called image

intesified tube & objective lens It has photo-cathode to convert phtons of

light energy into electrons

Continued..


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Image Enhancement:


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THERMAL IMAGING:

Employs special lens & phased array ofinfrared detector

Detector takes one-thirtieth of second to

create pattern called Thermogram Thermogram translated into electrical

impulses & sent to SPU circuit board

SPU connected to display unit where itappears as various colour


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TYPES:-

Uncooled Imaging Devices:

most common typeinfrared detector element contained in a

unit that operates at room temperature

system is quiet & activates immediately

system is more durable & protectable fromrugged use


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Cryogenically Cooled Devices:systems have elements sealed inside a

container that cools below 32F(0C)

incredible resolution & sensitivity

useful for detecting people or working innear absolute darkness

system can see a difference as small as0.2F from more than 1000 ft(300 m)away


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Thermal

Imaging


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GENERATIONS:Four types of generations

Generation 0Developed in earliest 1950s

Based on image conversion

Requires a source of infrared lightmounted on or near the device toilluminate target area

It was the oldest type and now no more inuse

Low gain & less operating life


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Generation 1:Developed in 1960s

Based on vacuum tube technology

Employs fibre optics plate & photo cathodetube

Amplification: 1000

Operating life: 2000 hrs

Larger & heavier than succeedinggenerations


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Generation 1


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one-quarter moon operation

Amplification: 20,000Operating life: 2500 hrs

Eliminates the need of back-to-back tubes

Multi alkali photo-cathode replaced with Ga-As photo-cathode


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Introduction of Ga-As photo-cathode & ion

barrier film on the MCPAmplification: 40,000

Operating life: 10,000 hrs

Ion barrier film increases operating life of

the tube to large extent


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APPLICATIONS:

Military Law enforcement Hunting

Wildlife observation Surveillance Security Navigation Hidden-object detection Entertainment


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SPECIFICATIONS:

Blooming

Black Spots

COMSPEC(Commercial Specification)

Chicken Wire

Diopter

Distortion

S-DistortionShear Distortion

Continued..


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Figure of Merit

Fixed Pattern Noise

FootlambertGain

Image Intensification(I2)

Interpupillary Distance Lumen

Resolution

Scintillation Signal-to-Noise Ratio

Zeroing


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OPERATIONS:

Manoeuvre

Firepower

Command & Control


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REFERENCES:

www.answer.com

www.nightvision.com

www.google.com

www.wikipedia.org
http://www.answer.com/http://www.nightvision.com/http://www.google.com/http://www.wikipedia.org/http://www.wikipedia.org/http://www.google.com/http://www.nightvision.com/http://www.answer.com/

Night Vison Technology

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