Night vision technology allows one to see in the dark and was originally developed for military use. There are two types of night vision: biological and technical. Technical night vision works using either image intensification, which amplifies available light, or thermal imaging, which detects infrared radiation emitted by warm objects. Night vision devices typically consist of an image intensifier tube, phosphor screen, objective lens, and may include an infrared illuminator. They are classified in generations based on capabilities and are used for military operations, hunting, wildlife observation, surveillance, security, and hidden object detection.

1. NIGHT VISION TECHNOLOGY Presented By- PRATIK MONDAL Roll No-2006 2004 Reg. No-387 of 2006-07 Department of Electronics & Communication Engineering University Institute of Technology(Burdwan University)

2. TABLE OF CONTENTS Introduction. Types of Night Vision The eye & the night vision. How night vision works Night vision devices Generations Applications. Conclusion. Reference

3. INTRODUCTION Night vision technology, literally allows one to see in the dark . It is originally developed for military use . With the proper night-vision equipment, we can see a person standing over 200 yards (183 m) away on a moonless, cloudy night.

4. It is quite easy to see everything during the day... But at night, we can see very little. Night device lets us to see again

7. The rods are responsible are responsible for vision under dim levels of illumination & the cones function at higher levels.

10. As electrons pass through the micro- channels, they cause thousands of other electrons to be released in each channel using a process called cascaded secondary emission. Basically, the original electrons collide with the side of the channel, exciting atoms and causing other electrons to be released. These new electrons also collide with other atoms, creating a chain reaction that results in thousands of electrons.

13. principal -: All objects emit infrared energy as a function of their temperature.A special lens focuses the infrared light emitted by all of the objects in view. The focused light is scanned by a phased array of infrared-detector elements. These create detailed temperature pattern called a thermogram. The thermogram created by the detector elements is translated into electric impulses. The impulses are sent to a circuit board with a dedicated chip that translates the information from the elements into data for the display.

14. 5. The signal-processing unit sends the information to the display, where it appears as various colors depending on the intensity of infrared emission.

16. Some thermal cameras show images in color. This false color distinguishes between objects at different temperatures.

18. The infrared-detector elements are contained in a unit that operates at room temperature.

20. infrared-detector elements are sealed inside a container that cools them to below 32 F .

22. Scopes:They are monocular normally handheld or mounted on a weapon.

23. Goggles:They are binocular and worn on the head.

26. Generation 1 : eg:-AN/PVS-2

28. Hunting

29. Wildlife observation

30. Surveillance

31. Security

32. Hidden-object detection Pic-Some Useful Application

34. Night vision devices are basically designed for utmost defensive purposes but the application within the scientific or the civilian range is often prohibited by law.

36. Any Question?

37. THANK YOU