Night vision technology

1. NIGHT VISION TECHNOLOGY
SUBMITTED BY :-
PRATIK SETH
ELECTRICAL AND ELECTRONICS ENGINEERING

2. CONTENTS
 Introduction
 Type of Night Vision
 The Basics
 Working of Night Vision
 Night Vision Devices
 Application
 Advantage & Disadvantage
 CONCLUSIONS
1

3. INTRODUCTION
 Night vision is the ability to see in low light conditions. like in
Moonless and cloudy night.
 Humans have poor night vision compared to other animals.
 With the proper night vision equipment, we can see a person
standing over 200 yards (183 m) away on a moonless, cloudy night.
2

4. Type of night vision
There are two type of night vision
 Thermal Imaging
 Image Intensifier
3

5. THE BASICs
 In order to understand night-vision, it is important to
understand something about light.
 The amount of energy in a light wave is related to its
wavelength : Shorter wavelength have higher energy.
 Of visible light, violet has the most energy, and red has the
least.
 Just next to the visible light spectrum is the infrared
spectrum
4

6. 5
Infrared light can be split into three categories:-
 Near–Infrared (Near-IR) :- Closest to visible light, near-infrared
has wavelengths that range from 0.7 to 1.3 microns.
 Mid-Infrared (Mid-IR) :- Mid-infrared has wavelengths range
from 1.3 to 3 microns.
 Thermal-Infrared (Thermal-IR) :- Occupying the largest part of
the infrared spectrum, it has wavelengths range from 3 - 30
microns.

7. WORKING OF NIGHT VISION
Image Intensifier :-
 Night vision amplifies light to achieve better vision.
 A conventional lens, captures ambient light.
 The gathered light is sent to the image-intensifier tube.
 The light energy released electron from the cathode and
accelerated.
 These electrons enter micro channel plate and bounce
and generate more electron.
6

8. 7
 Thousands of other electrons to be released in each channel.
 Original electrons collide with the channel, exciting atoms and
causing other electrons.
 New electrons collide with other atoms, creating a chain.

9. 8 In image-intensifier tube, the electrons hit a screen.
 The energy of the electrons release photons and create
green image on the screen.
 The green phosphor image is viewed through another lens.

10. NIGHT VISION DEVICEs
Night vision devices are basically divided into three
categories
SCOPES
 They are monocular normally.
 handheld or mounted on a weapon.
9

11. 10
GOGGLES :-
 They are binocular and worn on the head.

12. 11CAMERAS :-
 Used for transmission or recording of images mostly if the
location is fixed.

13. APPLICATIONS
 Military
 Hunting
 Security
 Navigation
 Hidden-Object Detection
12

14. ADVANTAGES
 No particular skill required
 Accidents cases reduction
 Detection of object in absolute darkness
 Less affected by temperature variation
DISADVANTAGEs
 The only disadvantage is that the Initial cost too high.
13

15. CONCLUSIONS
 Night vision is used to locate an object which is 200 yards
away even in moonless, cloudy night.
 The main purpose of night-vision was to locate enemy
targets at night.
 It is mainly used in military purpose as well as navigation,
surveillance and targeting.
14

16. THANK YOU