Intrusion detection system using three pyroelectric sensors
First Claim
1. An intrusion detection system comprising:
- an infrared sensor in which three pyroelectric detectors, each having a pair of electrodes, are disposed in line with an interval and an adjoining two of said three pyroelectric detectors are electrically connected to cancel electrical charges generated by each said pyroelectric detector, said sensor outputting a first signal and a second signal on the basis of outputs of said adjoining two and the remaining one of said three pyroelectric detectors, respectively; and
an intrusion detector which detects an infrared ray radiating object based on said first and second signals outputted from said infrared sensor.
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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.
38 Citations
11 Claims
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1. An intrusion detection system comprising:
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an infrared sensor in which three pyroelectric detectors, each having a pair of electrodes, are disposed in line with an interval and an adjoining two of said three pyroelectric detectors are electrically connected to cancel electrical charges generated by each said pyroelectric detector, said sensor outputting a first signal and a second signal on the basis of outputs of said adjoining two and the remaining one of said three pyroelectric detectors, respectively; and an intrusion detector which detects an infrared ray radiating object based on said first and second signals outputted from said infrared sensor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An intrusion detection system comprising:
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an infrared sensor having three pyroelectric detectors including a center pyroelectric detector and first and second adjoining pyroelectric detectors disposed on opposite sides of said center pyroelectric detector, each having a pair of electrodes, said pyroelectric detectors being disposed in line with an interval and an adjoining two of said three pyroelectric detectors are electrically connected to cancel electrical charges generated by each said pyroelectric detector, wherein said infrared sensor outputs a first signal based on an output from the center and the first adjoining pyroelectric detector, said center and first adjoining pyroelectric detectors being connected in series, and wherein said infrared sensor also outputs a second signal based on an output from the center and the second adjoining pyroelectric detector, said center and second adjoining pyroelectric detectors being connected to each other in series, and an intrusion detector which detects an infrared ray radiating object based on said first and secaond signals outputted from said infrared sensor. - View Dependent Claims (8, 9, 10, 11)
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Specification