Passive infra-red detectors

• US 7,705,310 B2
• Filed: 05/03/2007
• Issued: 04/27/2010
• Est. Priority Date: 03/21/2005
• Status: Active Grant

• Current Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Original Assignee: Visonic Incorporated (Johnson Controls International plc)
• Inventors: Zhevelev, Boris, Kotlicki, Yaacov, Lahat, Michael
• Primary Examiner(s): Porta; David P
• Assistant Examiner(s): Malevic; Djura
• Application Number:
  US11/744,176
• Publication Number:
  US 20090014654A1
• Time in Patent Office: 1,090 Days
• Field of Search: 250/339.02, 250/338.3, 250/342, 250/221
• US Class Current: 250/339.02
• CPC Class Codes: G01J 5/0025 Living bodies ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00
• CPC Class Codes: G01J 5/026 Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
• CPC Class Codes: G01J 5/07 Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position optical collimating elements G01J5/0806
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0802 Optical filters
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01J 5/0846 having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
• CPC Class Codes: G08B 13/193 using focusing means
• CPC Class Codes: G08B 29/18 Prevention or correction of operating errors G08B29/02, G08B29/12 take precedence
• CPC Class Codes: Y10S 250/01 Passive intrusion detectors

Abstract

A passive infra-red detector including at least three sub-detectors, each sub-detector being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each sub field-of-view being exclusively defined by an optical element which does not define any other sub field of view, the sub fields-of-view being angled with respect to each other, adjacent ones of the sub fields-of-view being separated by a gap of no more than 30 degrees and at least one of the sub fields-of-view having at least one of the following characteristics: extending over no more then 45 degrees in azimuth; and including not more than three azimuthally distributed detection zones, and signal processing circuitry, operative to receive output signals from the sub detectors and to provide a motion detection output.

Claims

1. A passive infra-red detector comprising:

at least two sub-detectors, each operative to receive infra-red radiation from a corresponding one of at least two sub fields-of-view; and

signal processing circuitry, receiving output signals from said at least two sub-detectors and noting time relationships of said output signals from said at least two sub-detectors and providing a motion detection output in response to receipt of said output signals from said at least two sub-detectors, representing traversal of said at least two sub fields-of-view, having a time relationship which meets at least one predetermined criterion,

at least one of said at least one predetermined criterion being traversal of said at least two sub fields-of-view in a first direction at least a predetermined time following traversal of said at least two sub fields-of-view in a second direction, generally opposite to said first direction.

2. A passive infra-red detector according to claim 1 and wherein said signal processing circuitry selectably provides at least one of a visual indication and an audible indication during said predetermined time.

3. A passive infra-red detector according to claim 2 and wherein said signal processing circuitry selectably provides both said visual indication and said audible indication during said predetermined time.

4. A passive infra-red detector according to claim 1 and wherein said predetermined time is defined by a user.