Intrusion or Burglar, alarms are systems designed to detect unauthorized entry into a building or area. They consist of an array of sensors, a control panel and alerting system, and interconnections. Sensors detect intruders by many methods such as monitoring door and window contacts, by passive infrared motion detectors, ultrasound, vibration, electric or magnetic fields, or microwaves. Sensors may be directly wired to a control panel that provides sensor power, or may communicate wirelessly.
Some alarm systems serve a single purpose of burglar or fire protection. Combination systems provide both fire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control systems for electrically-locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-zoned systems with color-coded computer monitor outputs.
Burglar alarms (or perimeter security systems, perimeter detection systems, Perimeter protection, intrusion detection systems and other terms for the same thing) are used in residential, industrial, and commercial properties for protection against theft or property damage. Mobile alarm systems protect vehicles and their contents (“car alarms”). Prisons and military facilities use intrusion detection systems for security and control of access.
These types of sensors are designed for indoor use. Outdoor use would not be advised due to false alarm vulnerability and weather durability.
- Passive infrared detectors
- Ultrasonic detectors
- Microwave detectors
- Photo-electric beams
- Glass break detectors
- Smoke, heat, and carbon monoxide detectors
These types of sensors would be found most of the time mounted on fences or installed on the perimeter of the protected area.
- Vibration (shaker) or inertia sensors
- Passive magnetic field detection
- E-field / H-field
- Microwave barriers
- Microphonic systems
- Taut wire fence systems
- Fibre optic cable