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7/31/2019 Night Vision Technology (Nvt)
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INDEX
INTRODUCTION
GOVERNING PRINCIPLE
TYPES
-Image intensification tech-Thermal imaging tech
N.V.T Characteristics
ADVANTAGES
LIMITATIONS
APPLICATIONS
FUTURE PROSPECTS
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WHAT IS NVT?
N.V.T encompass techniques of image conversion,
image intensification and thermal imaging
.
Night vision equipment has evolved from bulky
optical instruments in lightweight goggles.
Was first used in second world war.
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GOVERNING PRINCIPLE
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GOVERNING PRINCIPLE
Incoming light is
collimated by fiber
optic plates
Impacting aphotocathode which
releases electrons, ,
which in turn impact a
phosphor screen.
Green illumination is
liberated creating an
image.
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TYPES OF NVT
Image Intensification -works by collecting the tiny amounts of light.
- including the lower portion of the infrared light
spectrum.
Thermal imaging - operates by capturing the upper portion of the
infrared light spectrum emitted by hot objects.-Hotter objects, such as warm bodies, emit moreof this light than cooler objects.
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Image intensification technology
Takes the small amount of light that's in thesurrounding area (such as moonlight or starlight).
Converts the light energy (photons) into electricalenergy (electrons).
Electrons pass through a thin disk containingmore than 10 million channels.
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Image Intensification Technology
As the electrons go through the channels,
secondary emission of electrons takes place.
Electrons collides with phosphor screen
creating clear image even in night.
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Thermal Imaging Technology
Thermal imaging works as:
-A special lens focuses the infrared light emitted
by all of the objects in view.
-The focused light is scanned by a phased arrayforming thermogram pattern.
-The thermo gram created by the detectorelements is translated into electric impulses.
-The impulses are sent to a signal-processing unit.
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Some Characteristics OfN.V.T
Depth Perception
Degraded performance in Fog
and Rain
Honeycomb
dark and bright Spots
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ADVANTAGES
The ability to see in total darkness.
Possessing better vision than the enemy, thus
putting him at a disadvantage.
Increased mobility as a result of improved vision.
Quite useful in security and rescue operations.
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LIMITATIONS
Lack of clarity.
Limited field of vision.
Necessity of an additional power source.
Most night vision devices do not detect color
information
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APPLICATIONS
Military purposes
Law enforcement
Wildlife observation and hunting
Navigation
Investigation and security
Surveillance and hidden object detection
Search and rescue operations
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FUTURE PROSPECT
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CONCLUSION
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Thank you for your attention!
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