A security alarm[1] is a system designed to detect intrusion – unauthorized entry – into a building Security alarm or area. Security alarms are used in residential, commercial, industrial, and military properties for Security alarm protection against burglary (theft) or property damage, as well as personal protection against intruders. Car alarms likewise protect vehicles and their contents. Prisons also use security systems for control of inmates.
Some alarm systems serve Security alarm a single purpose of burglary protection; combination systems provide both fire and intrusion protection. Intrusion Security alarm alarm systems may also be combined with Security alarm closed-circuit television Security alarm surveillance systems to automatically record the Security alarm activities of intruders, and may interface to access control systems for electrically locked doors. Systems range from small, self-contained noisemakers, to Security alarm complicated, multi-area Security alarm systems with computer monitoring and control.
Contents
Security alarm
1 Design
2 Sensor types
2.1 Hermetically sealed reed switches
2.2 Passive infrared detectors
2.3 Ultrasonic Security alarm detectors
2.4 Microwave detectors
2.5 Compact Surveillance Radar
2.6 Photo-electric Security alarm beams
2.7 Glass break detection
2.8 Smoke, Security alarm heat, and carbon monoxide detectors
2.9 Motion Sensors
2.10 Driveway Alarms
2.11 Vibration (shaker) or inertia sensors
2.12 Passive magnetic field detection
2.13 E-field Security alarm
2.14 Microwave barriers
2.15 Microphonic systems
2.16 Taut wire fence Security alarm systems
2.17 Fibre optic cable
2.18 H-field
2.19 Security electric Security alarm fence
3 Wired, wireless and hybrid systems
4 Alarm connection and monitoring
5 Broadband alarm monitoring
6 Radio alarm dual signalling
7 Listen-in alarm monitoring
8 Alarm monitoring services
9 Alarm response
10 Access control Security alarm Security alarm and bypass codes
11 False and Security alarm absent alarms
12 False alarm reduction Security alarm
13 Audio and video verification
14 Cross Security alarm zoning
15 Enhanced call verification
16 Independent Security alarm certification
17 See also
18 References
19 Sources
20 External linksLibellés : Security alarm