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NIGHT VISION TECHNOLOGY

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NIGHT VISION TECHNOLOGY BY DEEPIKA.G.D 1DB05IS015 DBIT NIGHT VISION TECHNOLOGY Introduction NVT allows us to see in the dark Originally developed for military use Now ... – PowerPoint PPT presentation

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Title: NIGHT VISION TECHNOLOGY


1
NIGHT VISION TECHNOLOGY

  • BY
  • DEEPIKA.G.D

  • 1DB05IS015

  • DBIT

2
NIGHT VISION TECHNOLOGY
  • Introduction
  • Types of NVT
  • Thermal Imaging
  • Image Enhancement
  • Performance Attributes
  • Technical characteristics
  • Equipments
  • Applications
  • Conclusion
  • References

3
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.

4
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

5
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

6
Figure illustrates Generation 1 Night vision
technology.
7
Generation-1 (1960s)
  • Uses passive infrared
  • Uses ambient light provided by the moon and the
    stars
  • Dont require a source of projected infrared
    light
  • Dont 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

8
Figure illustrates Generation 2 Night vision
technology.
9
Generation-2 (1970s)
  • 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

10
Generation-3 (1990s)
  • Currently used by the US Army
  • Better resolution and sensitivity
  • Photocathode is made up of Gallium Arsenide
  • MCP is coated with an ion barrier
  • Tube life is increased

11
Generation-4 (2000s)
  • Known as filmless and gated technology
  • Shows significant improvement in both high- and
    low-level light environments
  • No ion barrier in MCP
  • Responds quickly to different lightning
    conditions
  • Reduced background noise
  • Enhances signal to noise ratio
  • Images are less distorted and brighter

12
Thermal imaging
  • This technology operates by capturing upper
    portion of the infrared light spectrum, which is
    emitted as heat
  • Hotter objects emit more of this light than the
    cooler objects
  • These elements then create a thermogram
  • Thermogram ?electric pulses? display data

13
The basic components of a Thermal-imaging system
14
Thermal imaging
It is quite easy to see everything during the
day...
...but at night, you can see very little.
Thermal
imaging lets you see again.
15
Thermal imaging devices
  • Two types
  • 1. Uncooled.
  • 2. Cryogenically cooled.
  • Great for detecting people or working in
    near-absolute darkness

16
Image Enhancement
17
Image Enhancement
  • It is also known as Image intensification
  • Relies on image intensifier tube to collect an
    amplify infrared and visible light
  • Lens captures the light which is then sent to
    image intensifier tube
  • It has photocathode that converts photons into
    electrons
  • When electrons pass through MCP ,more electrons
    are presented
  • This causes chain reaction where atoms are
    released
  • Electrons reach phosphor screen and photons are
    released
  • Those phosphor create green image

18
Performance Attributes
  • Sensitivity (photo response)- tubes ability to
    detect the available light
  • Signal- plays a key role in night visions
    performance
  • Resolution- ability to dissolve detail in the
    image

19
Technical Characteristics
  • Textures, Light and Dark
  • Depth Perception
  • Fog and Rain
  • Honeycomb
  • Spots

20
Equipments
  • Three categories
  • Scopes
  • Goggles
  • Cameras

21
Equipments
  • Scopes- monocular, handheld, better look at a
    specific object and then return to normal viewing
    conditions.
  • Goggles- binocular, handheld or worn, excellent
    for constant viewing
  • Cameras- send the image to a monitor for display
    or to a VCR for recording.

22
DARK INVADER Multi-purpose Pocketscope
DARK INVADER Night-vision Goggles 4501
23
Stealth 301 Series Day/Night Video Camera
Camcorders are a fast-growing segment of the
night-vision industry.
24
Soldiers using DARK INVADER night-vision Goggles.
25
Applications
  • Military
  • Law enforcement
  • Hunting
  • Wild life observation
  • Surveillance
  • Security
  • Navigation
  • Hidden-object detection
  • Entertainment

26
Conclusions
  • Although the term night vision'' currently
    encompasses three distinct technologies, it is
    the evolution of image intensification technology
    that first made devices practical and widely
    used.
  • Their success was the result of advancements in
    light amplification and resolution techniques.

27
References
  • http//electronics.howstuffworks.com/nightvision3.
    html
  • http//www.nightvision.com/military/militaryhome.h
    tml
  • http//www.physics.ohio-state.edu/wilkins/writing
    /Samples/shortmed/johnmedium/index.html
  • http//www.atncorp.com/HowNightVisionWorks
  • http//www.morovision.com/hownightvisionworks.htm
  • http//www.alanaecology.com/acatalog/Introduction_
    to_ Nightvision.html

28
NO(W) QUERIES...?
29
Thank You one and all
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