Scanning security detector

• US 8,508,366 B2
• Filed: 05/12/2008
• Issued: 08/13/2013
• Est. Priority Date: 05/12/2008
• Status: Active Grant

• Current Assignee: Bosch Security Systems Incorporated (Robert Bosch GmbH), Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Petricoin, Dennis M. Jr.
• Primary Examiner(s): Mehmood, Jennifer
• Assistant Examiner(s): WILSON, BRIAN P
• Application Number:
  US12/119,146
• Publication Number:
  US 20090278684A1
• Time in Patent Office: 1,919 Days
• Field of Search: 340555-557
• US Class Current: 340/555
• CPC Class Codes: G06V 10/147 Details of sensors, e.g. sensor lenses fingerprint or palmprint sensors G06V40/13; vascular sensors G06V40/145; eye sensors G06V40/19
• CPC Class Codes: G06V 20/52 Surveillance or monitoring of activities, e.g. for recognising suspicious objects recognising microscopic objects G06V20/69
• CPC Class Codes: G08B 13/181 using active radiation detection systems
• CPC Class Codes: G08B 29/046 prevention of tampering with detection circuits

Abstract

A method of identifying a potential security threat in a space. A first scan of the space is performed during a first time interval by illuminating at least a portion of the space with energy from an energy source at an illumination angle, such that the energy is reflected from a surface in the space. An incident angle of the reflected energy is detected with a detector located at a known distance from the energy source and a distance from the surface to the energy source is calculated based on the incident angle. The steps are repeated for a plurality of different locations in the space. A first map of the space is generated from the first scan, and a second map is generated from a second scan of the area. The maps are compared to determine a change in the space and to determine if a potential security threat is present.

Claims

1. A method of distinguishing false positives from threats in a space, the method comprising:

(a) collecting a first scan of the space during a first time interval, comprising

(i) illuminating at least a portion of the space with an energy from an energy source such that the energy is reflected from a surface in the space;

(ii) detecting the incident angle of the reflected energy with a plurality of detectors, each disposed at a known distance from the energy source;

(iii) calculating a distance from the surface to the energy source using triangulation and the incident angle detected by each of the plurality of detectors and distances between the plurality of detectors;

(iv) repeating steps (i)-(iii) for a plurality of portions of the space;

(v) generating a first three-dimensional map of the space for the first time interval;

(b) collecting a second scan of the space during a second time interval, comprising repeating steps (a)(i)-(a)(v) above during the second time interval to generate a second three-dimensional map of the space;

(c) comparing the first three-dimensional map to the second three-dimensional map to determine a change in the space;

(d) identifying a potential security threat based on the change in the space; and

(e) determining, based on the change in the space, if the potential security threat is a false positive based on a rate of movement, a height, and a location of the threat within the space.

2. The method of claim 1, wherein illuminating at least a portion of the space with energy from an energy source includes illuminating with a light source.

3. The method of claim 2, wherein illuminating with a light source includes illuminating with a laser.

4. The method of claim 3, wherein illuminating with a laser includes emitting a beam having a modulated signature.

5. The method of claim 1, wherein illuminating at least a portion of the space includes illuminating a room.

6. The method of claim 5, wherein illuminating a room include illuminating with a laser.

7. The method of claim 6, further comprising attaching each of the plurality of detectors and the laser to a ceiling of the room such that the laser is between the plurality of detectors.

8. A scanning security system, comprising:

a transmitter comprising an energy source and a scanning assembly;

a plurality of detectors, each configured to detect a direction of energy impinging thereon;

a computing system including a processor and a storage medium, the computing system configured to

(a) cause a first scan of a space during a first time interval, wherein the first scan includes

(i) illuminating at least a portion of the space with energy from the energy source at an illumination angle, such that the energy is reflected from a surface in the space;

(ii) detecting an incident angle of the reflected energy with each detector disposed at a known distance from the energy source;

(iii) calculating a distance from the surface to the energy source using triangulation based on the incident angle detected by each of the plurality of detectors and distances between the plurality of detectors;

(iv) repeating steps (i)-(iii) for a plurality of different locations in the space;

(v) generating a first three-dimensional map of the space for the first time interval;

(b) cause a second scan of the space at a second time interval, wherein the second scan includes repeating steps (a)(i)-(a)(v) above during the second time interval to generate a second three-dimensional map of the space;

(c) compare the first three-dimensional map to the second three-dimensional map to determine a change in the space; and

(d) determine if a potential security threat is present based on the change in the space, and

(e) determine, based on the change in the space, if the potential security threat is a false positive based on a rate of movement, a height, and a location of the threat within the space.

9. The scanning security system of claim 8, wherein the energy source comprises a laser.

10. The scanning security system of claim 9, wherein the detector comprises a hemispherical element having a plurality of tubes attached thereto, wherein each tube has an energy detection element disposed therein.

11. The scanning security system of claim 9, wherein the detector comprises an optical element focused on an array of detection elements.