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The following article was published in our article directory on October 10, 2012.
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Sensor Types Used in Wireless Burglar Alarms

Article Category: Advice

Author Name: Steve Holland

Wireless burglar alarms provide a cleaner, hassle-free way of installing burglar alarms by doing away with wires and cables. Since there are no cables and wires utilized, installation is easier and cheaper since you don't need to run cables all around the house. So you probably might be wondering, how does a wireless burglar alarms work?

Essentially, a simple burglar alarm is composed of a sensing device called a sensor and a device that will alert the user. As an intruder triggers a sensor, an alarm will sound, informing the user of the presence of an intruder. Sensors used in wireless burglar alarms vary and each type has its own pros and cons.

Passive Infrared- infrared motion detectors are one of the most common sensors used in home and small business alarm installations. These types of detectors detect intruders by sensing the heat given off by objects in the vicinity of the sensor. Differences in the room temperature and body temperature are detected by the sensor and trigger the alarm.

Ultrasonic - ultrasonic motion detectors use ultrasonic waves between the 15 kHz and 75 kHz frequency range. Ultrasonic waves are emitted from these devices and as it hit a moving person or object, the frequency bouncing back towards the device changes in frequency. The change in the transmitting and receiving frequencies trigger the alarm.

Microwave - microwave detectors operate similarly with passive infrared devices. This sensor type is commonly used in conjunction with passive infrared detectors to reduce false alarms.

Photo-electric - photo-electric devices emit a beam of infrared or visible light across a specific area. When an intruder passes through the path of the beam, the path is obstructed. The disturbance generated triggers the alarm.

Glass Break - this type of sensor uses sound frequencies which trigger an alarm whenever glass is shattered.

Heat, Smoke, and CO (carbon monoxide) - these specialized sensors are usually used on combination with existing alarm systems to further enhance its safety and security features.

Vibration/Inertia - primarily used on fences and similar barriers, these sensors are used to detect any attempt to attack the barrier itself. The threshold of vibration is adjusted depending on the specific structure the sensors will be installed on.

Passive Magnetic Field - an electromagnetic field is utilized to create a magnetic field. Intruders are detected when the magnetic field monitored by the sensors is disturbed by a passing person or object.

E-field - this new type of sensors have the capability of not just detecting an intruder, it can also determine the intruder's mass, rate of movement, and time the intruder passed through the field.

H-field - this sensor type utilizes RF (radio frequency) to detect changes in the strength of the field. Weakening of the field indicates the presence of an intruder, which in turn triggers an alarm.

Fiber optic - this new type of sensor measures the amount of light passing through the core of a fiber optic cable to detect an intruder passing by.

Keywords: Wireless Burglar Alarms

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