Title:
INFRARED-RAY PENETRATION DETECTOR
Document Type and Number:
Japanese Patent JPS61162785
Kind Code:
A
Abstract:
In an infrared intrusion detector which evaluates the body radiation of an intruder by means of a dual radiation sensor having two sensor elements arranged in a differential circuit for emitting an alarm signal, a functional supervision and detection of an attempt at sabotage, e.g., by covering or spraying the entrance window, are achieved by asymmetric irradiation of the two sensor elements through the entrance window by a radiation source. The asymmetry can be achieved by disposing the radiation source outside the plane of symmetry of the sensor elements or by an asymmetrically disposed auxiliary reflector.
Inventors:
KURUTO MIYURAA
BUARUTAA MAIYAA
BUARUTAA MAIYAA
Application Number:
JP82886A
Publication Date:
July 23, 1986
Filing Date:
January 08, 1986
Export Citation:
Assignee:
CERBERUS AG
International Classes:
G01J1/42; G01V8/10; G01V8/20; G08B13/18; G08B13/193; G08B29/00; G08B29/04; G08B29/14; (IPC1-7): G01J1/42; G01V9/04; G08B13/18
Attorney, Agent or Firm:
Michiteru Soga
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