Intrusion detection system using three pyroelectric sensors
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United States of America Patent
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Jul 24, 1990
Grant Date -
N/A
app pub date -
Jun 17, 1988
filing date -
Jun 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The intrusion detection system of the invention, in which three pyroelectric detectors are disposed in line with a interval and an adjoining two of the three pyroelectric detectors are electrically connected to cancel electrical charges generated by each pyroelectric detector, detects intrusion of an infrared ray radiating object such as a human body for example by output signals outputted from the adjoining two and the other of the three pyroelectric detectors or by output signals outputted from the pyroelectric detector disposed at the center and adjoining one and output signals outputted from the one disposed at the center and adjoining another one of these pyroelectric detectors, so that precise and secure intrusion detection is possible by reducing erroneous signals generated by those pyroelectric detectors due to variation of the atmospheric temperature and the like.
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