Fiber optic security system for sensing the intrusion of secured locations

• US 20090201153A1
• Filed: 01/23/2009
• Published: 08/13/2009
• Est. Priority Date: 03/21/2003
• Status: Active Grant

• Current Assignee: Woven Electronics LLC (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Woven Electronics LLC (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Phillips, Mark C., Browning, Thomas E. JR.
• Granted Patent: US 7,956,316 B2
• Time in Patent Office: Days
• US Class Current: 340/551
• CPC Class Codes: E02D 29/1481 Security devices, e.g. indicating unauthorised opening E02D29/1427 takes precedence
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
• CPC Class Codes: G08B 13/124 with the breaking or disturbance being optically detected, e.g. optical fibers in the perimeter fence
• CPC Class Codes: G08B 13/186 using light guides, e.g. optical fibres
• CPC Class Codes: H02G 9/10 in cable chambers, e.g. in manhole or in handhole

Abstract

A sensor for a security system is disclosed to detect intrusions at one or more predetermined locations wherein each location includes a moveable member which must be moved in order to intrude the location. The system includes a fiber network routed in close proximity to one or more locations. The sensor comprises a sensor housing for being disposed at a location to detect a predetermined movement of the moveable member from a secure position to an unsecured position, and means for mounting the sensor housing in a stationary position at the location without a physical connection to the moveable member. The sensor housing includes a fiber inlet and a fiber outlet, and a fiber chamber for receiving a predetermined sensor fiber of the fiber network being routed through the sensor housing. The sensor has a sensor actuator for engaging the sensor fiber to generate an intrusion signal upon detecting predetermined movement of the moveable member, and causing the intrusion signal to be transmitted along the sensor fiber to a processor whereby the intrusion and location of the intrusion may be determined by the processor. Preferably, the sensor includes a magnetic actuator having a magnetic attraction to the moveable members whose interruption causes activation of the sensor and generation of the intrusion signal.

Claims

1. A security system for detecting intrusion at a plurality of predetermined locations using a fiber network composed of a plurality of optic fibers routed in close proximity to said locations, said system comprising:

sensors disposed at said locations contacting an optic fiber from said fiber network selected as a sensor fiber for detecting physical intrusions at said locations and generating intrusion signals when one or more sensors are activated;

a processor in communication with said sensor fiber for receiving said intrusion signals from said activated sensors and determining the location of each activated sensor; and

a communication output operatively associated with said processor for communicating an identification of each activated sensor and the location of each said activated sensor.

2. The system of claim 1 wherein said locations include a moveable member which must be moved in order to intrude into said location, said sensors being disposed adjacent said moveable members in a non-contacting manner, and said sensors detecting a predetermined movement of said moveable members from a secured position to an unsecured position whereby intrusion signals are generated without physical connection between said sensors and said moveable members.

3. The system of claim 2 wherein said sensors include magnetic attractions between said sensors and said moveable members whose interruption causes activation of said sensors and generation of said intrusion signals.

4. The system of claim 3 wherein said sensors include a reciprocating sensor actuator having a deactivated position and an activated position, said sensor actuator engaging said sensor fiber when said moveable members are in an unsecured position causing sensor activation and said intrusion signal to be generated.

5. The system of claim 4 wherein said moveable sensor actuator forms a predetermined bend in said sensor fiber when activated to produce a characteristic intrusion signal that is readily recognizable by said processor to reliably detect a sensor activation and sensor location.

6. The system of claim 5 wherein said sensor actuator includes a first contoured abutment with a prescribed contour for engaging said sensor fiber, and said prescribed contour producing said predetermined bend in said sensor fiber upon activation of said sensor.

7. The system of claim 6 wherein said sensor includes a sensor housing having a fiber chamber, said sensor fiber being routed through said fiber chamber with a natural bend producing no attenuation in said sensor fiber when said sensor is deactivated, and said sensor actuator engaging said natural bend of said sensor fiber to form said predetermined bend in said sensor fiber when said sensor is activated causing attenuation in said sensor fiber and generation of said intrusion signal.

8. The system of claim 7 wherein said fiber chamber includes a fiber receiving space defined between said first contoured abutment of said sensor actuator and a second contoured abutment through which said sensor fiber passes.

9. The system of claim 8 wherein said second contoured abutment engages said sensor fiber to produce said natural bend when said sensor is deactivated, and said first contoured abutment engages said sensor fiber to produce said predetermined bend when said sensor is activated.

10. The system of claim 9 wherein said first and second contoured abutments are carried by said movable actuator.

11. The system of claim 10 including a biasing element connected between said movable actuator and said sensor housing which forces said first contoured abutment into engagement with said sensor fiber when said sensor is activated.

12. The system of claim 7 wherein said sensor housing includes a fiber inlet and a fiber outlet so that said sensor fiber is routed through said inlet, through said fiber chamber where said sensor fiber assumes said natural bend, and through said fiber outlet.

13. A security system for detecting intrusion at one or more predetermined locations wherein each location includes a moveable member which must be moved in order to intrude into said location, said system comprising:

a fiber network routed in proximity to said one or more locations;

a sensor disposed at each of said one or more locations for detecting a predetermined movement of said moveable member to an unsecured position at said location;

a predetermined fiber of said fiber network being physically connected to each said sensor to provide a sensor fiber;

said sensor being mounted in a stationary position at said location without a mechanical connection to said moveable member;

said sensor generating an intrusion signal upon detecting said predetermined movement of the moveable member at one location, said intrusion signal being transmitted along said sensor fiber;

a processor in communication with said fiber receiving said intrusion signal for determining the location of an activated sensor; and

communication output providing information of an activation and location of said sensor in response to said processor receiving said intrusion signal.

14. The system of claim 13 wherein said sensors include magnetic attractions between said sensors and said moveable members whose interruption causes activation of said sensors and generation of said intrusion signal.

15. The system of claim 13 wherein said sensors include moveable sensor actuators having a deactivated position and an activated position, said sensor actuator engaging said sensor fiber when said moveable members are in an unsecured position causing sensor activation and said intrusion signal to be generated.

16. The system of claim 15 wherein said moveable sensor actuator forms a predetermined bend in said sensor fiber when activated to produce a characteristic intrusion signal that is readily recognizable by said processor to reliably detect a sensor activation and sensor location.

17. The system of claim 15 wherein said sensor includes a sensor housing having a fiber chamber, said optic sensor fiber being routed through said fiber chamber with a natural bend producing no attenuation in said sensor fiber when said sensor is deactivated, and said sensor actuator engaging said natural bend of said sensor fiber to form said predetermined bend in said sensor fiber when said sensor is activated causing attenuation in said sensor fiber and generation of said intrusion signal.

18. The system of claim 17 wherein said fiber chamber includes a fiber receiving space defined between said first contoured abutment of said sensor actuator and a second contoured abutment between which said sensor fiber passes.

19. The system of claim 18 wherein said second contoured abutment engages said sensor fiber to produce said natural bend when said sensor is deactivated, and said first contoured abutment engages said sensor fiber to produce said predetermined bend when said sensor is activated.

20. The system of claim 19 wherein said sensor housing includes a fiber inlet and a fiber outlet so that said sensor fiber is routed through said inlet, through said fiber chamber where said sensor fiber assumes said natural bend, and through said fiber outlet.

21. A sensor for a security system detecting intrusions at one or more predetermined locations wherein each location includes a moveable member which must be moved in order to intrude said location, and a fiber network routed in close proximity to said one or more locations, said sensor comprising:

a sensor housing for being disposed at a location to detect a predetermined movement of said moveable member from a secure position to an unsecured position;

means for mounting said sensor housing in a stationary position at said location without a physical connection to said moveable member;

a fiber inlet and a fiber outlet formed in said housing;

a fiber chamber in said housing for receiving a predetermined fiber of said fiber network being routed through said sensor housing; and

said sensor having a sensor actuator for generating an intrusion signal upon detecting said predetermined movement of the moveable member at a location causing said intrusion signal to be transmitted along said fiber of said fiber network to a processor;

whereby the intrusion and location of the intrusion may be determined by said processor.

22. The system of claim 21 wherein said sensor includes a magnetic actuator having a magnetic attraction to said moveable members whose interruption causes activation of said sensor and generation of said intrusion signal.

23. The system of claim 21 wherein said sensor includes a moveable sensor actuator having a deactivated position and an activated position, said sensor actuator engaging said sensor fiber when said moveable member is in an unsecured position causing sensor activation and said intrusion signal to be generated.

24. The system of claim 23 wherein said moveable sensor actuator forms a predetermined bend in said sensor fiber when activated to produce a characteristic intrusion signal that is readily recognizable by said processor to reliably detect a sensor activation and sensor location.

25. The system of claim 24 wherein said fiber chamber is constructed to receive said sensor fiber when routed through said fiber chamber with a natural bend producing no attenuation in said sensor fiber when said sensor is deactivated, and said sensor actuator engaging said natural bend of said sensor fiber to form said predetermined bend in said sensor fiber when said sensor is activated causing attenuation in said sensor fiber and generation of said intrusion signal.

26. The system of claim 25 wherein said fiber chamber includes a fiber receiving space defined between said first contoured abutment of said sensor actuator and a second contoured abutment between which said sensor fiber passes.

27. The system of claim 26 wherein said second contoured abutment engages said sensor fiber to produce said natural bend when said sensor is deactivated, and said first contoured abutment engages said sensor fiber to produce said predetermined bend when said sensor is activated.

28. The system of claim 27 wherein said first and second contoured abutments are carried by said movable actuator.

29. The system of claim 28 including a biasing element connected between said movable actuator and said sensor housing which forces said first contoured abutment into engagement with said sensor fiber when said sensor is activated.

30. A method for detecting intrusion into a protected location using a fiber network connected to an optical reflectometer processor, said method comprising:

providing a sensor for detecting a predetermined movement of a moveable member which must be moved in order to intrude into said location;

providing a connection between a fiber of the fiber network and said sensor so that a predetermined movement of said moveable member causes said sensor to be activated and to generate an intrusion signal which is transmitted to said reflectometer device through said fiber; and

processing said intrusion signal to determine location of said sensor.

31. The method of claim 30 including using an existing utility fiber network carrying at least one of voice and data signals, and providing connection to a fiber of said fiber network as a sensor fiber for generating and transmitting said intrusion signal.

32. The method of claim 31 including providing said connection between said fiber and said sensor without making a physical connection between said fiber and said moveable member.

33. The method of claim 32 including providing a sensor having a moveable actuator which contacts said fiber causing generation of said intrusion signal in response to movement of said moveable member to said unsecured position.

34. The method of claim 33 including providing a magnetic attraction between said moveable actuator and said moveable member which is broken when said moveable member is moved to said unsecured position.

35. The method of claim 30 including arranging said fiber to have a natural bend producing generally no attenuation when said sensor is deactivated, and deforming said natural bend to a predetermined bend when said sensor is activated to generate said intrusion signal having a discernible characteristic wave form.