DETECTOR

• US 20120228477A1
• Filed: 03/12/2012
• Published: 09/13/2012
• Est. Priority Date: 03/10/2011
• Status: Active Grant

• Current Assignee: Vanderbilt International GmbH
• Original Assignee: Siemens AG
• Inventors: BACHELS, THOMAS, ERNI, ANDREAS, FISCHER, SIMON DANIEL, GRUBER, PETER
• Granted Patent: US 8,772,702 B2
• Time in Patent Office: Days
• US Class Current: 250/208.2
• CPC Class Codes: G08B 13/191 using pyroelectric sensor means
• CPC Class Codes: G08B 29/046 prevention of tampering with detection circuits

Abstract

A detector contains a housing with at least one window for allowing radiation to enter, at least one outlook sensor for sensing entered radiation, a unit for processing outlook sensor signals, and outlook mirrors that are shaped and mounted in the housing for reflecting onto the outlook sensor radiation from outside detection zones better than radiation from elsewhere. At least some of the outlook mirrors face the window and in operative orientation neighbor each other vertically. The detector further contains one or more window sensors for sensing radiation indicative of the window being masked or having been damaged and a unit for processing window sensor signals. A gap between at least two of the outlook mirrors allows radiation to travel between the window and at least one window sensor or accordant window sender or both.

Claims

1. A detector, comprising:

a housing with at least one window for allowing radiation to enter;

at least one outlook sensor for sensing entered radiation;

a unit for processing outlook sensor signals;

outlook mirrors shaped and mounted in said housing for reflecting onto said outlook sensor the radiation from outside detection zones better than the radiation from elsewhere, at least some of said outlook mirrors face said window and in operative orientation neighbor each other vertically;

an accordant window sender;

at least one window sensor for sensing the radiation indicative of said window being masked or having been damaged, said unit additionally processing window sensor signals output by said window sensor; and

a gap between at least two of said outlook mirrors allowing the radiation to travel between said window and said at least one window sensor or said accordant window sender or both.

2. The detector according to claim 1, wherein said outlook mirrors include primary outlook mirrors and secondary outlook mirrors, the radiation from some of the outside detection zones is reflected first by said primary outlook mirrors and then by said secondary outlook mirrors onto said outlook sensor.

3. The detector according to claim 1, wherein said gap extends between at least some of said outlook mirrors in two horizontal rows of neighboring ones of said outlook mirrors.

4. The detector according to claim 3, wherein:

linked ones of said outlook mirrors reflect the radiation from a detection zone consecutively;

each of said outlook mirrors in at least one linked pair of said outlook mirrors is shaped and mounted in said housing so as to prevent said linked pair from reflecting the radiation from another detection zone in sequence with other said outlook mirrors onto said outlook sensor; and

at least one of said outlook mirrors in said linked pair is mounted in one of said horizontal rows.

5. The detector according to claim 1, further comprising focusing means, said window sender and said focusing means for focusing radiation there from on said window or outside the detector.

6. The detector according to claim 1, further comprising focusing means for focusing radiation from said window or from outside the detector onto said window sensor.

7. The detector according to claim 5,

further comprising a substrate, at least some of said outlook mirrors, which face said window and in operative orientation neighbor each other vertically, is made on a substrate;

and

wherein said focusing means has at least one window mirror that has been made on said substrate.

8. The detector according to claim 1, wherein one of said window sensor or said window sender contains a semiconductor diode.

9. The detector according to claim 1, further comprising a printed circuit board, one of said window sensor or said window sender is mounted on said printed circuit board that extends behind said gap.

10. The detector according to claim 1, wherein said unit for processing outlook sensor signals is suitable for generating an output representative of a movement of an object through the outside detection zones.