Intrusion alarm apparatus
First Claim
1. An intrusion detection apparatus for detecting intrusions into an enclosure comprising:
- first sensor means for detecting intrusions within a first portion of said enclosure and responsively providing a first sensor output signal,second sensor means, having a different type of detection operaton than said first sensor means, for detecting intrusions within a second portion of said enclosure and responsively providing a second sensor output signal, where said second portion is in close proximity to said first portion,control means for detecting said first and second sensor output signals, said control means including means for sensing when said first and second sensor output signals occur within a predetermined time relationship, and said control means including means for generating an alarm signal when said first and second sensor output signals occur within said predetermined time relationship.
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Accused Products
Abstract
An intrusion detection apparatus employing two or more diverse types of sensors for sensing entries into a room, building or other enclosure. The sensors are connected to a signal processor which processes sensor output signals to indicate when an intrusion has occured. One type of sensor is a local sensor which includes a sensor conductor in combination with a phase locked loop. Whenever an intruding object is within close proximity to the sensor conductor and disturbs the conductor field, the equilibrium condition of the phase locked loop is disturbed to provide a sensor output signal. A second type of sensor includes in one embodiment an omni-directional antenna having a field which is located in close proximity to or which is overlapping the field of the sensor conductor. Whenever the omni-directional antenna and the sensor conductor are disturbed, the two disturbances are detected by the signal processor to signal an intrusion if the proper time relationship exists between them.
27 Citations
27 Claims
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1. An intrusion detection apparatus for detecting intrusions into an enclosure comprising:
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first sensor means for detecting intrusions within a first portion of said enclosure and responsively providing a first sensor output signal, second sensor means, having a different type of detection operaton than said first sensor means, for detecting intrusions within a second portion of said enclosure and responsively providing a second sensor output signal, where said second portion is in close proximity to said first portion, control means for detecting said first and second sensor output signals, said control means including means for sensing when said first and second sensor output signals occur within a predetermined time relationship, and said control means including means for generating an alarm signal when said first and second sensor output signals occur within said predetermined time relationship. - View Dependent Claims (4, 5, 6, 7, 10, 11, 12, 13, 25)
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2. An instrusion detection apparatus for detecting instrusions into an enclosure comprising:
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generation means for generating a control signal at a control frequency, first sensor means for detecting instrusions within a first portion of said enclosure and responsively providing a first sensor output signal, said first sensor means including a sensor conductor for changing reactance in response to the presence of a body within said first portion, including a phase locked loop connected to receive the control signal and connected to said sensor conductor, operative to lock on said control frequency and detect changes in reactance of said sensor conductor to provide a loop output signal having an amplitude responsive to said control frequency and said changes in reactance, and includes sensor generator means for generating said first sensor output signal in response to said loop signal, second sensor means, having a different type of detection operation than said first sensor means, for detecting intrusions within a second portion of said enclosure and responsively providing a second sensor output signal where said second portion is in close proximity to said first portion, control means for detecting said first and second sensor output signals, said control means including means for sensing when said first and second sensor output signals occur within a predetermined time relationship, and said control means including means for generating an alarm signal when sad first and second sensor output signals occur within said predetermined time relationship. - View Dependent Claims (3, 8, 9)
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14. An intrusion detection apparatus for detecting intrusions into an enclosure comprising:
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a plurality of first sensor means each for respectively detecting intrusions within a plurality of different first portions of said enclosure and responsively providing a plurality of first sensor output signals, second sensor means, having a different type of detection operation than said first sensor means, for detecting intrusions within a second portion of said enclosure and responsively providing a second sensor output signal, where said second portion is in close proximity to said first portion, common transmission means coupled to said first sensor means for conducting said first sensor output signals, control means coupled to said transmission means for detecting said first and second sensor output signals, said control means including means for generating an alarm signal only when at least one of said first sensor output signals and said second sensor output signal have a predetermined time relationship. - View Dependent Claims (15, 16, 17, 18, 19, 21, 26, 27)
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20. In an intrusion alarm system,
first means for generating a plurality of first intrusion detection signals, second means for generating one or more second intrusion detection signals, common transmission means coupled to said first means for conducting said first intrusion detection signals, control means coupled to said transmission means for detecting said first and second intrusion detection signals, said control means including means for sensing when said first and second intrusion detection signals occur within a predetermined time relationship, and said control means including means for generating an alarm signal only when said first and second intrusion detection signals occur within the predetermined time relationship.
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22. An intrusion detection apparatus for detecting intrusions into an enclosure comprising:
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generation means for generating a control signal at a test frequency or at an operating frequency, a plurality of first sensor means each for establishing a field for detecting intrusions within a plurality of portions of said enclosure, respectively, each of said first sensor means connected to said generation means for receiving said control signal and including means for providing an identifying first sensor output signal responsive to changes in said control signal and responsive to changes in the respective field, control means including means sensing the presence of said first sensor output signals for sensing an intrusion or a test condition including means for selectively controlling said generation means to switch from said operating frequency to said test frequency whereby each of said first sensor means is caused to produce the respective first sensor output signal to test each of said sensor means. - View Dependent Claims (23)
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24. An intrusion detection apparatus for detecting intrusions into an enclosure comprising:
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generation means for generating a control signal at a test frequency or at an operating frequency, a plurality of first sensor means each having a sensor conductor for establishing a field for detecting intrusions within a plurality of first portions of said enclosure, respectively, each of said first sensor means including phase locked loop means connected to said generation means for receiving said control signal and connected to said sensor conductor for providing an identifying first sensor output signal responsive to changes in said control signal and responsive to changes in the respective field, second sensor means having a different type of detection operation than said first sensor means for detecting intrusions into a second portion of said enclosure and responsively-providing a second sensor output signal, said second sensor means including field generation means for providing a field covering a predetermined volume of said enclosure, common transmission means for conducting said first sensor output signals and said control signal, control means coupled to said transmission means including means for sensing the presence of said first sensor output signals and thereby for sensing an intrusion or a test condition;
including means for selectively controlling said generation means to switch from said operating frequency to said test frequency whereby each of said first sensor means is caused to produce a respective first sensor output signal and thereby to test each of said first sensor means;
including means for detecting at least one of said first sensor output signals and for detecting within a predetermined time relationship said second sensor output signal, and including alarm means for generating an alarm signal when said first and second sensor output signals occur within a predetermined time relationship.
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Specification