Intruder detection and warning system

• Main Authors: WHITTEN STEPHEN, STOCKSTILL RICHARD
• Format: Patent
• Language: English
• Published: 05.02.2008
• Subjects: ALARM SYSTEMS; ORDER TELEGRAPHS; PHYSICS; SIGNALLING; SIGNALLING OR CALLING SYSTEMS

An intruder detection and warning system has a plurality of infrared sensors for receiving infrared radiation from respective contiguous areas of premises in need of security. A central illumination unit including a rotatable light is operated to project a beam illuminating a selected one of the contiguous areas of the premises in response to the received infrared radiation by the infrared sensor in the selected area indicating presence of a person in the selected area. Initially a polite message randomly selected from a group of different polite messages is broadcast to request the intruder to leave the premises. When continued presence of the intruder is detected, the light beam is moved away from and then back to the selected area and a further message randomly selected from a group of different more demanding messages is broadcast to demand the intruder to leave the premises. Thus computerized control of the central illumination unit to selectively illuminate areas monitored by respective infrared sensors to detect intruders mimics manual monitoring and security enforcement to more effectively deter intruders. Control of the illumination unit with an associated video camera is passed to a remote monitoring station upon continued failure of the intruder to vacate the premises.