MOTION DETECTION SYSTEMS AND METHODOLOGIES

• US 20130119253A1
• Filed: 11/15/2012
• Published: 05/16/2013
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Original Assignee: Visonic Ltd (Johnson Controls International plc)
• Inventors: ZHEVELEV, Boris, KOTLICKI, Yaacov, LAHAT, Michael
• Granted Patent: US 9,188,487 B2
• Time in Patent Office: Days
• US Class Current: 250/338.3
• CPC Class Codes: G01J 5/34 using capacitors, e.g. pyroelectric capacitors
• CPC Class Codes: G08B 13/191 using pyroelectric sensor means

Abstract

A motion detector system including first and second pairs of pyro-electric elements, electrical interconnections between the pyro-electric elements in the first pair providing a first signal output and local temperature compensation for the elements in the first pair, electrical interconnections between the elements in the second pair providing a second signal output and local temperature compensation for the pyro-electric elements in the second pair, wherein the compensation for the first pair is independent of the compensation for the second pair, a housing enclosing the two pairs of pyro-electric elements and defining a window, only one of the pyro-electric elements in each pair viewing a motion detection field of view through the window, and a signal processor receiving the first and second signal outputs and providing an output indication of crossing the field of view by an object having a temperature different from the ambient in the field of view.

Claims

1. A motion detector system comprising:

at least first and second pairs of pyro-electric elements;

electrical interconnections between the pyro-electric elements in said first pair of pyro-electric elements, providing a first signal output and local temperature compensation for the two pyro-electric elements in said first pair;

electrical interconnections between the pyro-electric elements in said second pair of pyro-electric elements, providing a second signal output and local temperature compensation for the two pyro-electric elements in said second pair, wherein the local temperature compensation for the two pyro-electric elements in said first pair is independent of the local temperature compensation for the two pyro-electric elements in said second pair;

a housing enclosing said at least first and second pairs of pyro-electric elements and defining a window, only one of said pyro-electric elements in said first pair and only one of said pyro-electric elements in said second pair viewing a motion detection field of view through said window; and

a signal processor electrically receiving said first signal output and said second signal output and providing an output indication of crossing said field of view by an object having a temperature different from the ambient in said field of view.

2. A motion detector system according to claim 1 and wherein said signal processor is operative to provide detection of crossing said field of view by an object at an angular velocity of between 1 and 2 degrees per second.

3. A motion detection system according to claim 1 and wherein said signal processor is operative to disregard repeated crossing of said field of view in opposite directions by an object at an angular velocity less than 0.5 degrees per second.

4. A motion detection system according to claim 1 and wherein said signal processor provides an output indication of direction of crossing said field of view by an object having a temperature different from the ambient in said field of view.

5. A motion detection system according to claim 4 and wherein said signal processor provides an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a first general direction and not in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a second general direction opposite to said first general direction.

6. A motion detection system according to claim 4 and wherein said signal processor provides a first output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a first general direction and a second output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a second general direction opposite to said first general direction.

7. A motion detection system according to claim 4 and wherein said signal processor provides an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view and not in respect of a stationary object having a temperature different from the ambient in said field of view.

8. A motion detection system according to claim 4 and wherein said signal processor provides an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view and not in respect of a stationary object outside of said field of view having a temperature different from the ambient in said field of view.

9. A motion detection system according to claim 4 and wherein said signal processor provides an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view and not in respect of repeated back-and-forth crossings of said field of view by an object having a temperature different from the ambient in said field of view.

10. A motion detection system according to claim 4 and wherein said signal processor provides an alarm output indication in respect of crossing said field of view by a human and not in respect of crossing said field of view by a pet.

11. A method for detecting motion, the method comprising:

electrically interconnecting between the pyro-electric elements of a first pair of pyro-electric elements, providing a first signal output and local temperature compensation for the two pyro-electric elements in said first pair;

electrically interconnecting between the pyro-electric elements of a second pair of pyro-electric elements, providing a second signal output and local temperature compensation for the two pyro-electric elements in said second pair, wherein the local temperature compensation for the two pyro-electric elements in said first pair is independent of the local temperature compensation for the two pyro-electric elements in said second pair;

enclosing said at least first and second pairs of pyro-electric elements and defining a window, only one of said pyro-electric elements in said first pair and only one of said pyro-electric elements in said second pair viewing a motion detection field of view through said window; and

electrically receiving said first signal output and said second signal output and providing an output indication of crossing said field of view by an object having a temperature different from the ambient in said field of view.

12. A method according to claim 11 and wherein said providing an output indication is responsive to detection of crossing said field of view by an object at an angular velocity of between 1 and 2 degrees per second.

13. A method according to claim 11 and also comprising disregarding repeated crossing of said field of view in opposite directions by an object at an angular velocity less than 0.5 degrees per second.

14. A method according to claim 11 and also comprising providing an output indication of direction of crossing said field of view by an object having a temperature different from the ambient in said field of view.

15. A method according to claim 14 and also comprising providing an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a first general direction and not in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a second general direction opposite to said first general direction.

16. A method according to claim 14 and also comprising providing a first output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a first general direction and a second output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view in a second general direction opposite to said first general direction.

17. A method according to claim 14 and also comprising providing an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view and not in respect of a stationary object having a temperature different from the ambient in said field of view.

18. A method according to claim 14 and also comprising providing an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view and not in respect of a stationary object outside of said field of view having a temperature different from the ambient in said field of view.

19. A method according to claim 14 and also comprising providing an alarm output indication in respect of crossing said field of view by an object having a temperature different from the ambient in said field of view and not in respect of repeated back-and-forth crossings of said field of view by an object having a temperature different from the ambient in said field of view.

20. A method according to claim 14 and also comprising providing an alarm output indication in respect of crossing said field of view by a human and not in respect of crossing said field of view by a pet.

21. A pyro-electric sensor comprising:

at least first and second pairs of pyro-electric elements;

electrical interconnections between the pyro-electric elements in said first pair of pyro-electric elements, providing a first signal output and local temperature compensation for the two pyro-electric elements in said first pair;

electrical interconnections between the pyro-electric elements in said second pair of pyro-electric elements, providing a second signal output and local temperature compensation for the two pyro-electric elements in said second pair, wherein the local temperature compensation for the two pyro-electric elements in said first pair is independent of the local temperature compensation for the two pyro-electric elements in said second pair; and

a housing enclosing said at least first and second pairs of pyro-electric elements and defining a window, only one of said pyro-electric elements in said first pair and only one of said pyro-electric elements in said second pair viewing a motion detection field of view through said window.

22. A method for pyro-electric sensing, the method comprising:

electrically interconnecting between the pyro-electric elements of a first pair of pyro-electric elements, providing a first signal output and local temperature compensation for the two pyro-electric elements in said first pair;

electrically interconnecting between the pyro-electric elements of a second pair of pyro-electric elements, providing a second signal output and local temperature compensation for the two pyro-electric elements in said second pair, wherein the local temperature compensation for the two pyro-electric elements in said first pair is independent of the local temperature compensation for the two pyro-electric elements in said second pair; and

enclosing said at least first and second pairs of pyro-electric elements and defining a window, only one of said pyro-electric elements in said first pair and only one of said pyro-electric elements in said second pair viewing a motion detection field of view through said window.