1. NIGHT VISION ENHANCER

2. Acknowledgement

3. CONTENTS Introduction Component Circuit Diagram
Night Vision Equipment and Applications
Advantages
Disadvantages
Conclusion

4. INTRODUCTION
"Night vision" as referenced here is that technology that provides us with the miracle of vision in total darkness and the improvement of vision in low light environment. Night vision has existed for more than fifty years. Its importance is remarkable mostly in warfare, though night vision has numerous uses. Modern hunters rely in night vision to hunt animals during the night without being exposed to them
Night vision has had many improvements throughout the course of history. Its beginning date back to Second World War when the Germans idealized a very effective way to easily use their sniper rifles during the night. This was later researched very deeply into because night vision proved to have a devastating advantage for those who used it.

5. Night vision uses a very complex mechanism some what similar to modern TV's As a matter of fact; more than 200 chemicals substances are needed in order to make night vision product work effectively
There are currently two different technologies for night vision .The first one is thermal vision and second one is regular vision. Both of them are used for detect object, though they both have advantage and disadvantages. On the other hands regular vision cannot function in complete darkness because they Use technology capable of multiplying existent light by thousands of times -And not detect it from elsewhere.

6. COMPONENTS
Green LED
Resistor
Capacitor
Battery
Switch
IC 555

7. Green LED

8. A light-emitting diode (LED) is a semiconductor light source
A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared Wavelengths, with very high brightness. LEDs are often small in area (less than 1 mm2), and integrated optical components may be used to shape its radiation pattern. LEDs present many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved robustness, smaller size, faster switching, and greater durability and reliability. LEDs powerful enough for room lighting are relatively expensive and require more precise current and heat management than compact fluorescent lamp sources of comparable output.

9. Resistor
A linear resistor is a linear, passive two-terminal electrical component that implements electrical resistance as a circuit element. The current through a resistor is in direct proportion to the voltage across the resistor's terminals. Thus, the ratio of the voltage applied across a resistor's terminals to the intensity of current through the circuit is called resistance. This relation is represented by Ohm's law:

10. CACITOR
A capacitor (formerly known as condenser) is a passive two-terminal electrical component used to store energy in an electric field. The forms of practical capacitors vary widely, but all contain at least two electrical conductors separated by a dielectric (insulator). Capacitors are used as parts of electrical systems, for example, consist of metal foils separated by a layer of insulating film.

11. BATTERY(electricity)
An electrical battery is one or more electrochemical cells that convert stored chemical energy into electrical energy. There are two types of batteries: primary batteries (disposable batteries), which are designed to be used once and discarded, and secondary batteries (rechargeable batteries), which are designed to be recharged and used multiple times. Batteries come in many sizes

12. SWITCH
In electronics, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.

13. THE 555 IC

14. The 555 is commonly called a TIMER IC
The 555 is commonly called a TIMER IC. It is an 8-pin chip and has a number of different identifications:  LM555CN from National and SE555/NE555 from Signetics are just two manufacturers. These numbers all refer to the most common and cheapest version, we call the 555. 
The 555 contains more than 28 transistors and it is basically a chip containing a number of building blocks that end up very similar to an oscillator without the TIMING COMPONENTS.  It needs two or three external components to produce an oscillator capable of operating at a frequency from 1Hz to 500kHz. When it oscillates at a frequency less than 1Hz, the circuit is called a Timer or Delay. The chip also has a pin (pin 2) that prevents the chip from starting the Timing cycle until it is taken LOW. Another pin (pin 4) stops the chip from oscillating (or continuing with a delay-time) when it is taken LOW and a pin (pin 5) that can adjust the mark-space ratio of the waveform.  

15. CIRCUIT DIAGRAM

16. Here is a simple green LED flashlight built around 555 timer IC (IC1) and powered from a 3V battery pack.Green LED based flashlights are widely used by hunters and others in similar activities to light their way and alert other hunters of their presence. Green light does not interface with the hunt,as animals are blind or indifferent to green light.Green is also a good nightvision retention colour that allows one to distinguish colours such as yellow and red on maps and charts. Key component of this flashlight is a 555 timer (IC1) that is configured as an astable multivibrator generating a 50 per cent duty cycle square wave at approximately 6Hz frequency.Three 5mm green LEDs (LED1 through LED3) are connected at output pin 3 of IC1.Resistors R1 through R3 limit the current through the LEDs to prevent them from burning up. Switch S1 is the main on/off switch.In normal mode,IC1 is disabled by normally-closed (N/C) push-to- off switch S1 keeping its output low.As a result,all LEDs (LED1– LED3) glow continuously.On the other hand,when S2 is depressed,IC1 is enabled and all LEDs start flashing at approximately 6Hz frequency.

17. Night Vision Equipment and Applications
Night-vision equipment can be split into three broad categories:
Scopes - Normally handheld or mounted on a weapon, scopes are monocular (one eye-piece). Since scopes are handheld, not worn like goggles, they are good for when you want to get a better look at a specific object and then return to normal viewing conditions.

18. Goggles - While goggles can be handheld, they are most often worn on the head. Goggles arebinocular (two eye-pieces) and may have a single lens or stereo lens, depending on the model. Goggles are excellent for constant viewing, such as moving around in a dark building.
Cameras – Cameras with night-vision technology can send the image to a monitor for display or to aVCR for recording. When night-vision capability is desired in a permanent location, such as on a building or as part of the equipment in a helicopter, cameras are used. Many of the newercamcorders have night vision built right in.

19. Applications Military Law enforcement Hunting Wildlife observation
Surveillance
Security
Navigation
Hidden-object detection
Entertainment

20. ADVANTAGES
Night vision devices are compact in size and is easily portable.
It is widely used in military purposes so it is reliable.
Its working is very simple so it is easy to use.
It is designed for a long life.

21. DISADVANTAGES Night vision devices is very costly.
It cannot properly be used in rain and fog as it degrade its performance.
Poor quality images due to black spots.

22. CONCLUSION
The new generation began to discover the unique world that can be found after darkness falls. Thus in the modern times night vision technology become a part of our daily life. Night vision devices can be useful to all of us just be sure to get the right type of our needs.