Burglar Alarms and Home Security

Alarm systems and devices are in common use today in commercial establishments and even in residences. Burglar alarms are designed to work more sensitively to human motions.

A popular burglar alarm is the use of a photosensor that connects with a beam of light across the room, mostly at the entrance. This burglar alarm works as a person crosses the door or room and disturbs the continuous connection of the light beam and the photosensor. Once the disturbance occurs, the cut-off light beam triggers off the burglar alarm bell that works automatically.

Another burglar alarm is a by the use of a radar detector. This type of burglar alarm is used for establishments with automatic doors. The radar works as a person enters and triggers the automatic door, also triggering the radar system. Actually the mechanism also triggers the automatic opening of the door. A box fixed above the door works as a microwave energy sender. The energy reaches a certain point and then bounces back to the microwave energy box at a specific time interval. When a person disturbs the flow of microwave energy, the door opens automatically because the energy sent is either weakened or deflected. A microwave energy burglar alarm works in the same way, and thus easily installed with an automatic door.

Burglar alarms that work through ultrasonic sound waves also works somewhat with the same triggering principle. The echo emitted by the ultrasonic sound device bounces of when a person is near or is about to enter a door. When the echo returns the door automatically opens. This mechanism can also be the triggering mechanism of an ultrasonic wave burglar alarm system to work automatically as a person goes near or enters the door.

The above are all energy oriented burglar alarms that work with an energy sources (light, microwaves, or sound) as the triggering mechanism. The main principle is that the burglar alarm works extra sensitive enough that it detects the slightest changes in the light, sound, or microwave that is constantly emitted. Passive infra red burglar alarms, such as those dependent on light, works as a passive alarm scheme. They are also called pyroelectric burglar alarms, which work relying on sounds. Some burglar alarms work by sensing human body heat as it approaches the active range of these burglar alarms.

Modern burglar alarms are extra sensitive devices that work automatically as they pick up the slightest change in light, sound, or microwave motion around them.

Tags: Burglaries, Crime Prevention, Burglar Alarms, Security, Alarms, Alarm