1. Night Vision Technology
Dharmendra Sinha
CSE 4th Year

2. Contents Introduction History Technical Techniques Benefits
How Image Intensifier works?
How Thermal Imaging Works?
Near Infrared illumination
Night Vision Devices
Benefits
Challenges
Applications
Future Scope
Conclusion
References

3. Introduction
Night vision is used to locate an object which is 200 yards away even in moonless, cloudy night.
Night vision can work into two different ways, depending on the technology used .
They are image enhancement and thermal imaging. Image enhancement works by collecting lower portion of infrared light spectrum
Thermal imaging operates by capturing the upper portion of the infrared light spectrum

4. History
Pre 1940’s: Flares and spot lights were used for operations at night.
The first night vision devices (NVD) were created during World war-II.
Functioned by placing an infrared filter over a searchlight.

5. A tank from World War II equipped with a search light used for night combat.

6. Image Enhancement Thermal Imaging Near Infrared illumination
Technical Techniques
Image Enhancement Thermal Imaging Near Infrared illumination

7. Image Enhancement
This works by collecting the tiny amounts of light, including the lower portion of the infrared light spectrum and amplifying it to the point that we can easily observe the image.
It requires some light.

8. How It Works ?

9. Thermal Imaging
This technology operates by capturing the upper portion of the infrared light spectrum, which is emitted as heat by objects instead of simply reflected as light. Hotter objects, such as warm bodies, emit more of this light than cooler objects like trees or buildings.
It does not require any light.

10. How It Works ?

11. Near Infrared illumination
Near-infrared illumination is a method of night vision wherein a device that is sensitive to invisible near infrared radiation is used in conjunction with an infrared illuminator.
Like thermal imaging, near-infrared illumination may provide visibility in fog, rain and snow.

12. It can be splitted in three broad categories:
Night Vision Devices
It can be splitted in three broad categories:

13. Night Scopes

14. Goggles

15. Cameras

16. Benefits Distant vision in night is possible
Detection of objects in absolute darkness
Less affected by temperature variation

17. Challenges You can get blind if u look at something bright.
We can’t see full colored image.
Night Vision devices are costly.

18. Applications Military Hunting Wildlife observation Surveillance
Security
Hidden-object detection

19. Future Scope
It may allow soldiers to share images of what they see with other soldiers who may be miles away.
Scientists are experimenting with Panoramic Night Vision Goggles (PNVGs) which double the user's field of view to around 95 degrees

20. Conclusion
Today in the 21st century we have come a long way in the development of night vision technology, from the early 1940’s.
In present scenario the applications of night vision technology is very essential to combat terrorism which is a major problem being faced by mankind.

21. References Wikipedia Youtube sofradirec.com/hownightvisionworks
howstuffworks.com

22. Thank you
Any Queries ??