24-04-2012, 04:34 PM
LASER BASED INTRUDER ALARM
laser based intruder alarm.ppt (Size: 1.78 MB / Downloads: 364)
Concept of Laser Based Intruder Alarm
During the olden days a watchman would be hired to take care of property and offer needed security in the home. Some homes also had fierce dogs that would be let out only at night. The two were supposed to provide security to our belongings even in the absence of the owner. However, hiring a watchman was not an effective method since most of them would be killed in the line of duty. Sometimes dogs would attack even visitors while some watchmen looted property.
About the circuit
The circuit is divided into two parts i.e. the transmitter and the receiver.
The transmitter circuit is nothing but a laser diode driven by a battery connected to the diode
In order to ensure that the current remains constant in the diode a 5V or 7.5V is applied to the diode.
The laser diode here can be the one typically used in laser pointers emitting in red. This would be more economical than buying one.
Advantages
Simplicity of installation.
The effective ability to be used indoors and outdoors.
It could be used as an effective alarm for the house/company boundaries.
It uses the normal power outlets and telephone jacks in case it used indoors.
Disadvantages
The disadvantage of laser beam system is that it may get activated by a cat walking on the wall or a large bird sitting on the wall.
They are more expensive compared to simple security alarm systems.
Applications: Can be used as home security system
Can be used in Museums, Banks, Offices for safe guard many valuable things
Conclusion
The Laser Based Intruder Alarm was built to our satisfaction. This project is about how to prevent theft in homes, offices, banks, museums etc, This project can be implemented by both wired and wireless technologies. Another application of this instrument is as an "ANTI-THEFT SYSTEM", that means to protect vehicles from kidnapping. In short I am sure that this device is highly useful to mankind especially present scenario.