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Basic motion sensor alarm introduction

Traditional Circuit Alarms

Motion Sensor AlarmThere are two types of circuit alarm: closed circuit and open circuit. The concept is a simple electrical current in which is either open or close. This can be applied on a window or a door. The alarm is triggered when the door or window is opened.

The disadvantage of this system is that all the burglar has to do is to cut off the wires, nevertheless the control box is usually put away so the criminal can’t find it easily. This is the most common type of motion sensor alarms.

Motion Detectors

Motion detector works by constantly monitoring a space for irregular wave patterns. The idea is that when there are disturbances in the room this perturbs the general pattern that the sensor is set to, thus triggering the alarm. This is a radar-based motion sensor.

Another type of motion sensors are photo-sensors and infrared sensors. In the first example it works by hitting a beam of light to a sensor. For example it can be fitted across a pass way between a door or a room. If a person is between the beam of light and its sensor, the alarm is triggered. This is also a very commonly used motion sensor alarm nowadays.

In the infrared sensor, which are more advanced, it triggers the alarm by detecting a higher temperature (output by a human for example), which will usually be higher than the ambient temperature in a house. Obviously it is not a good idea to use this type of alarm if you own a pet.

One thing is true, there’s never enough security to be implemented in your own house!


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This entry was posted on Thursday, October 22nd, 2009 at 10:33 am and is filed under History. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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