Friday, September 4, 2009

How Does A Motion Detector Work?

. Friday, September 4, 2009

An alarm system is a great way to provide extra protection for your home. There are plenty of options available for you to ensure your home’s safety. So don’t take chances. Protect your family with a home security system that will safeguard your most precious valuables, and the people you love.

What are they?

Motion detectors spot the movement in areas covered by the security sensors. Motion detectors transmit high frequency radio wave signals. They give a warning that someone is entering into your home.

Different kinds of motion detectors & how they work:

Infrared Sensors:

Motion detectors use infrared light to detect heat changes, i.e. when a person moves across this light it detects them with the help of the infrared sensors. If a person moves in the range of the motion sensors, the alarm is activated. Infrared sensors are cheaper than microwave sensors and ultrasonic sensors. Infrared sensors are generally smaller and very reliable.

Vibration Sensors:

It detects a person through vibration. Many car alarms have this feature to alert the owner that something has bumped into their car.

Photoelectric Sensors:

Some motion detection systems use lasers and photoelectric beams. The laser is shot across to the other side of the room or doorway. If the laser is interrupted the unit's alarm signal is activated.

Ultrasonic sensors :

They use a frequency around 30kHz. The transmitter bounces the waves of walls, furniture, windows and ceilings and when the room has stabilized, the alarm is armed.

Acoustic Sensors:

They can detect the energy produced by any kind of sound, including breaking glass. In the case of breaking glass from window intrusions, the pattern of the sound emitted is detected.


rasel20t said...

I used to be an alarm install technician. And while I know nothing about industry lobbying, I do know that almost all consumer model alarm systems have a verification system. When the alarm goes off, the monitoring company calls your home and can listen in on the panel. They ask you your secret pass-phrase and/or verify your identity. If there is nothing or no noise, then the police are called.
And, motion sensors are pet-friendly and can distinguish between your dog and a person pretty easily- unless your dog weighs over 100 pounds.
Alarm Monitoring

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