An alarm system is often the core element of a property's security system. The primary purpose of a security alarm is to promptly notify the property owner or security service of any unauthorized entry into the protected facility. Security alarm systems vary in the design and operating principles of their sensors, signal transmission methods, and the features of their signal analysis and security alert systems.
Alarm system sensors operate using various principles. The simplest sensor is an electrical circuit whose interruption triggers an alarm; in this case, reed switches are typically used. Another type of sensor is an optical sensor, which can detect when an intruder crosses the beam or react to changes in optical parameters within the field of view. There are also a number of specialized alarm sensors that respond to vibration, changes in electrical capacitance, and other parameters.
