Infrared radiation-burglary detector

• US 4,052,616 A
• Filed: 11/04/1976
• Issued: 10/04/1977
• Est. Priority Date: 06/30/1976
• Status: Expired due to Term

• Current Assignee: Cerberus ABP Investor LLC (Cerberus Capital Management LP)
• Original Assignee: Cerberus ABP Investor LLC (Cerberus Capital Management LP)
• Inventors: Keller, Hansjurg
• Primary Examiner(s): Willis, Davis L.
• Application Number:
  US05/738,846
• Time in Patent Office: 334 Days
• Field of Search: 250/338, 250/340, 250/342, 250/353, 250/221, 250/227, 340/258 B
• US Class Current: 250/353
• CPC Class Codes: G01J 1/0266 Field-of-view determination; Aiming or pointing of a photometer; Adjusting alignment; Encoding angular position; Size of the measurement area; Position tracking; Photodetection involving different fields of view for a single detector
• CPC Class Codes: G01J 1/04 Optical or mechanical part supplementary adjustable parts
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/0425 using optical fibers
• CPC Class Codes: G08B 13/193 using focusing means
• CPC Class Codes: Y10S 250/01 Passive intrusion detectors

Abstract

An infrared radiation-burglary detector comprising radiation-focusing means and a radiation receiver. A bunch of radiation-conducting elements is provided, the radiation inlet openings of which are arranged at the focal surface of the radiation-focusing means and the radiation outlets of which are arranged in front of the radiation receiver.

Claims

1. An infrared radiation-burglary detector comprising radiation-focusing means having a focal surface, a radiation receiver, a bundle of radiation-conducting elements having radiation inlet openings and radiation outlet openings, the radiation inlet openings being located substantially at the focal surface of the radiation-focusing means and the radiation outlet openings being located in front of the radiation receiver.

2. The detector as defined in claim 1, wherein the radiation-focusing means are defined by part of an internally reflecting spherical surface, the radiation inlet openings being arranged at the focal surface of the spherical surface, said focal surface comprising a spherical surface of approximately half the radius of said internally reflecting spherical surface of said radiation-focusing means.

3. The detector as defined in claim 2, wherein the radiation receiver is arranged approximately at the center of the internally reflecting spherical surface, the radiation-conducting elements each are of approximately the same length.

4. The detector as defined in claim 3, wherein the radiation receiver is arranged at the center of the sphere defined by at least part of the spherical surface, and the radiation-conducting elements possess a length which approximately corresponds to half of the radius of the sphere.

5. The detector as defined in claim 2, wherein the radiation receiver is arranged at the center of the sphere defined by at least part of the spherical surface, and the radiation-conducting elements possess a length which approximately corresponds to half of the radius of the sphere.

6. The detector as defined in claim 2, wherein the radiation-focusing means comprises a body having an internally reflecting cavity and constituting part of a sphere.

7. The detector as defined in claim 6, wherein the body is formed of plastic.

8. The detector as defined in claim 6, wherein the body is formed of glass.

9. The detector as defined in claim 2, further including diaphragm means arranged in front of the radiation-focusing means.

10. The detector as defined in claim 2, wherein the radiation-focusing means comprises a hemisphere.

11. The detector as defined in claim 10, further including diaphragm means arranged in front of the radiation-focusing means.

12. The detector as defined in claim 10, wherein the radiation receiver is arranged at the center of the hemisphere and the radiation-conducting elements possess a length which approximately corresponds to half of the radius of the hemisphere.

13. The detector as defined in claim 10, wherein the radiation-receiver is arranged approximately at the center of the hemisphere, the radiation-conducting elements each are of approximately the same length.

14. The detector as defined in claim 1, further including diaphragm means arranged in front of the radiation-focusing means.

15. The detector as defined in claim 1, wherein the radiation-focusing means comprises a collecting lens.

16. The detector as defined in claim 15, wherein the collecting lens is an echelon lens.

17. The detector as defined in claim 1, wherein the radiation-focusing means comprises a number of facet-shaped collecting lenses arranged at a substantially spherical surface, said collecting lenses having focal surfaces which at least approximately adjoin one another to form a spherical surface.

18. The detector as defined in claim 17, wherein the facet-shaped arranged collecting lenses assume the configuration of approximately a hemisphere.

19. The detector as defined in claim 17, wherein the radiation receiver is arranged approximately at the center of said spherical surface, the radiation-conducting elements each are of approximately the same length.

20. The detector as defined in claim 19, further including diaphragm means arranged in front of the radiation-focusing means.

21. The detector as defined in claim 18, wherein the radiation receiver is arranged approximately at the center of the hemisphere, the radiation-conducting elements each are of approximately the same length.

22. The detector as defined in claim 1, wherein the radiation-conducting elements comprise optical fibers of a radiation pervious material within which there occurs conductance of the radiation by means of an internal total reflection.

23. The detector as defined in claim 1, wherein the radiation-conducting elements are constructed as internally-reflecting tubes of predetermined cross-section.

24. The detector as defined in claim 1, wherein the radiation-conducting elements comprise waveguide means for electromagnetic waves.

25. The detector as defined in claim 1, wherein the radiation inlets of the radiation-conducting elements possess directional characteristic.

26. The detector as defined in claim 1, wherein the radiation-conducting elements are flexible.