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A security alarm[1] is a system designed to detect intrusion – unauthorized entry – into a building or area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders. Car alarms likewise protect vehicles and their contents. Prisonsalso use security systems for control of inmates.
Some alarm systems serve a single purpose of burglary 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-area systems with computer monitoring and control.
The most basic alarm consists of one or more sensors to detect intruders, and an alerting device to indicate the intrusion. However, a typical premises security alarm employs the following components:
- Premises control unit (PCU), Alarm Control Panel (ACP), or simply panel: The “brain” of the system, it reads sensor inputs, tracks arm/disarm status, and signals intrusions. In modern systems, this is typically one or more computer circuit boards inside a metal enclosure, along with a power supply.
- Sensors: Devices which detect intrusions. Sensors may be placed at the perimeter of the protected area, within it, or both. Sensors can detect intruders by a variety of methods, such as monitoring doors and windows for opening, or by monitoring unoccupied interiors for motions, sound, vibration, or other disturbances.
- Alerting devices: These indicate an alarm condition. Most commonly, these are bells, sirens, and/or flashing lights. Alerting devices serve the dual purposes of warning occupants of intrusion, and potentially scaring off burglars. These devices may also be used to warn occupants of a fire or smoke condition.
- Keypads: Small devices, typically wall-mounted, which function as the human-machine interface to the system. In addition to buttons, keypads typically feature indicator lights, a small multi-character display, or both.
- Interconnections between components. This may consist of direct wiring to the control unit, or wireless links with local power supplies.
- Security devices: Devices to detect thieves such as spotlights, cameras & lasers.
In addition to the system itself, security alarms are often coupled with a monitoring service. In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station see the signal and take appropriate action, such as contacting property owners, notifying police, or dispatching private security forces. Such signals may be transmitted via dedicated alarm circuits, telephone lines, or Internet.
Norman
Norman /ˈnɔːrmən/ is a city in the U.S. state of Oklahoma 20 miles (30 km) south of downtown Oklahoma City in its metropolitan area. The population was 110,925 at the 2010 census.[1] Norman’s estimated population of 120,284 in 2015 makes it the third-largest city in Oklahoma, and the city serves as the county seat of Cleveland County.
Norman was settled during the Land Run of 1889, which opened the former Unassigned Lands of Indian Territory to American pioneer settlement. The city was named in honor of Abner Norman, the area’s initial land surveyor, and was formally incorporated on May 13, 1891. Economically the city has prominent higher education and related research industries, as it is the home to the University of Oklahoma, the largest university in the state, with approximately 30,000 students enrolled. The university is well known for its sporting events by teams under the banner of the nickname “Sooners,” with over 80,000 people routinely attending football games. The university is home to several museums, including the Fred Jones Jr. Museum of Art, which contains the largest collection of French Impressionist art ever given to an American university, as well as the Sam Noble Oklahoma Museum of Natural History.
The National Weather Center, located in Norman, houses a unique collection of university, state, federal, and private sector organizations that work together to improve the understanding of events related to the Earth’s atmosphere. Norman lies within Tornado Alley, a geographic region where tornadic activity is particularly frequent and intense. The Oklahoma City metropolitan area, including Norman, is the most tornado-prone area in the world. The Storm Prediction Center (SPC), a branch of the National Oceanic and Atmospheric Administration (NOAA) is located at the NWC. SPC forecasts severe storm and tornado outbreaks nationwide. Additionally, research is conducted at the co-located National Severe Storms Laboratory (NSSL), which includes field research and operates various experimental weather radars.
In 2008, CNN‘s Money Magazine ranked Norman as the sixth best small city within the United States to live in.