Radiation detector

• US 4,058,726 A
• Filed: 07/22/1976
• Issued: 11/15/1977
• Est. Priority Date: 08/09/1975
• Status: Expired due to Term

• Current Assignee: Cerberus AG Switzerland
• Original Assignee: Cerberus AG Switzerland
• Inventors: Paschedag, Hansjoachim, Keller, Hansjurg
• Primary Examiner(s): Borchelt, Archie R.
• Application Number:
  US05/707,834
• Time in Patent Office: 481 Days
• Field of Search: 250/338, 250/353, 250/342, 340/258 D
• US Class Current: 250/353
• CPC Class Codes: G08B 13/193 using focusing means
• CPC Class Codes: Y10S 250/01 Passive intrusion detectors

Abstract

A radiation detector for simultaneously detecting electromagnetic radiation from a number of separate receiving regions by means of a single radiation receiver. Optical bundling means are arranged such that they direct the radiation emanating from the individual receiving regions onto the single radiation receiver. The optical bundling means comprise surfaces having two different main radii of curvature. The radiation receiver is arranged at the one main focal point of the individual surfaces.

Claims

1. A radiation detector for simultaneously detecting electromagnetic radiation from a number of separate receiving regions, comprising a single radiation receiver common to said number of separate receiving regions, a plurality of optical bundling means, each one of said optical bundling means being operatively related to a given one of said separate receiving regions and being arranged such that the radiation emanating from the individual receiving regions is transmitted to the single radiation receiver, each of the optical bundling means comprising an aspherical surface having two different main radii of curvature, and the radiation receiver is arranged at least approximately at one of the main focal points of the individual surfaces, for generating a pattern of spaced apart substantially strip-like receiving regions, each having a lengthwise extent considerably exceeding the width thereof.

2. The radiation detector as defined in claim 1, wherein the optical bundling means each consist of a reflector means having two different approximately parabolic-shaped main sections.

3. The radiation detector as defined in claim 2, further including means for integrating the individual reflector surfaces into a mechanical unit.

4. The radiation detector as defined in claim 3, wherein the reflector surfaces each have a main focal point and are aligned such that each of their main focal points at least approximately coincide.

5. The radiation detector as defined in claim 1, wherein the optical bundling means each comprise a substantially cylindrical lens.

6. The radiation detector as defined in claim 1, especially for detecting a self-radiating object at at least one of the receiving regions, further including an evaluation circuit for detecting, by means of a change of an output signal of the radiation receiver, passage of the object through at least one of the receiving regions.

7. The radiation detector as defined in claim 1, wherein the individual surfaces have main curvature directions oriented substantially horizontally and vertically with respect to the optical bundling of the radiation.

8. The radiation detector as defined in claim 7, wherein each receiving region has a vertical aperture angle which is greater than its horizontal aperture angle.

9. The radiation detector as defined in claim 8, wherein the horizontal aperture angles of the receiving regions approach zero.

10. The radiation detector as defined in claim 1, further including a housing having a front side which is pervious to infrared radiation, the optical bundling means of the radiation receiver being arranged in said housing.

11. The radiation detector as defined in claim 1, wherein the lengthwise extent of each receiving region is a multiple of the width thereof.