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VALLURUPALLI NAGESWARA RAO VIGNANA JYOTHI INSTITUTE OF ENGINEERING & TECHNOLOGY

AN AUTONOMOUS INSTITUTE(Approved by AICTE, New Delhi and Govt. of A.P. & affiliated to JNTUH)

Vignana Jyothi Nagar, Bachupally, Nizampet (S.O.) Hyderabad – 500090.A.P. India.Tel: +91-40-23042758, 23042759, 23042760, Fax: 91-40-23042761

E-mail: postbox@vnrvjiet.ac.in, Website: www.vnrvjiet.ac.in

DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING

2013-2014

In guidance with G.C.Prabhakar sir........................

Presented

by……….

11253-EE-056

11253-EE-051

11253-EE-026

11253-EE-007

11253-EE-006

LASER Security alarm system

• A security alarm is a system designed to detect intrusion – unauthorized entry – into a building or area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders. Car alarms likewise protect vehicles and their contents. Prisons also use security systems for control of inmates.

But we are working on a security alarm with laser, there are many types of security alarm.

Now in our daily life we are mostly using security alarm with help of laser, they can be seen in dark light but in brightness we can’t see with naked eye.

Advantages of security alarm with laser:

It is easy in construction. It lights in weight. Light weight as compared to other security systems. It economical. If any burglary happens people will alert easily.

Applications of laser security alarm:

Circuit diagram:

Components used:

Resistors -330Ω - 2no

-1kΩ- 2no. Transistors -BC547- 2no

-BC109-1no. LDR (light dependent resistor) 9V battery Buzzer General PCB board LASER ( light amplification by stimulated emission of radiation).

Resistor 

The current through a resistor is in directly proportion to the voltage across the resistor's terminals. This relationship is represented by Ohm's law:

Resistor is a device which opposes the flow of electrons

where I is the current through the conductor in units of amperes, V is the

potential difference measured across the conductor in units of volts, and R is

the resistance of the conductor in units of ohms (symbol: Ω).

In this circuit we are using the resistor to limit the current into the transistors

and the buzzer.

LASER

Light Amplification by Stimulated Emission of Radiation is an electronic device that produces light (electromagnetic radiation) through a process of optical amplification. These radiation have very special properties that makes them used in a wide variety of applications. 

It is used to manufacture a wide range of electronic devices including CD ROMs, Bar code readers, etc. The light emitted by these devices is thin and coherent.

Applications of LASER:

It is used in CD and DVD ROMs. They are also used in barcode scanners Used as an integral part of nuclear fusion reactors In devices used for alignment, cutting, soldering, drilling,

surface treatment, welding etc. In medical equipments for dentistry, cosmetic treatment

etc In military equipments like anti missiles devices In Laser Printers for printing