| An alarm system is a great way to provide | | | | |
| extra protection for your home. There are | | | | Vibration Sensors: |
| plenty of options available for you to ensure | | | | |
| your home's safety. So don't take chances. | | | | It detects a person through vibration. Many |
| Protect your family with a home security | | | | car alarms have this feature to alert the |
| system that will safeguard your most precious | | | | owner that something has bumped into their |
| valuables, and the people you love. | | | | car. |
| | | | |
| What are they? | | | | Photoelectric Sensors: |
| | | | |
| Motion detectors spot the movement in areas | | | | Some motion detection systems use lasers and |
| covered by the security sensors. Motion | | | | photoelectric beams. The laser is shot across |
| detectors transmit high frequency radio wave | | | | to the other side of the room or doorway. If |
| signals. They give a warning that someone is | | | | the laser is interrupted the unit's alarm |
| entering into your home. | | | | signal is activated. |
| | | | |
| Different kinds of motion detectors & how | | | | Ultrasonic sensors : |
| they work: | | | | |
| | | | They use a frequency around 30kHz. The |
| Infrared Sensors: | | | | transmitter bounces the waves of walls, |
| | | | furniture, windows and ceilings and when the |
| Motion detectors use infrared light to detect | | | | room has stabilized, the alarm is armed. |
| heat changes, i.e. when a person moves across | | | | |
| this light it detects them with the help of | | | | Acoustic Sensors: |
| the infrared sensors. If a person moves in | | | | |
| the range of the motion sensors, the alarm is | | | | They can detect the energy produced by any |
| activated. Infrared sensors are cheaper than | | | | kind of sound, including breaking glass. In |
| microwave sensors and ultrasonic sensors. | | | | the case of breaking glass from window |
| Infrared sensors are generally smaller and | | | | intrusions, the pattern of the sound emitted |
| very reliable. | | | | is detected. |