Magnetic Field Activated Intrusion Detection
First Claim
1. An intrusion detection system, comprising:
- a plurality of intrusion detection devices, each intrusion detection device corresponding to one of a plurality of components, each intrusion detection device comprising;
a magnetic field activated sensor operable to;
detect movement of its corresponding component by sensing a magnetic flux variation of a magnetic device coupled to the corresponding component; and
generate a signal indicating that the corresponding component has moved; and
a cascading circuit, comprising;
a first input coupled to the magnetic field activated sensor and operable to receive the signal generated by the magnetic field activated sensor indicating that the corresponding component has moved; and
a second input coupled to another cascading circuit of another intrusion detection device;
the cascading circuit operable to generate a tamper detection signal if the signal indicating that the corresponding component has moved is received at the first input or if another tamper detection signal generated by the other intrusion detection device is received at the second input.
1 Assignment
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Accused Products
Abstract
In certain embodiments, an intrusion detection device includes a magnetic field activated sensor and a cascading circuit. The magnetic field activated sensor is operable to detect movement of a corresponding component by sensing a magnetic flux variation of a magnetic device coupled to the component and generate a signal indicating that the corresponding component has moved. The cascading circuit is coupled to the magnetic field activated sensor and is operable to receive the signal generated by the magnetic field activated sensor and to generate a tamper detection signal if the signal indicating that the corresponding component has moved is received or if another tamper detection signal generated by another intrusion detection device is received.
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Citations
20 Claims
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1. An intrusion detection system, comprising:
a plurality of intrusion detection devices, each intrusion detection device corresponding to one of a plurality of components, each intrusion detection device comprising; a magnetic field activated sensor operable to; detect movement of its corresponding component by sensing a magnetic flux variation of a magnetic device coupled to the corresponding component; and generate a signal indicating that the corresponding component has moved; and a cascading circuit, comprising; a first input coupled to the magnetic field activated sensor and operable to receive the signal generated by the magnetic field activated sensor indicating that the corresponding component has moved; and a second input coupled to another cascading circuit of another intrusion detection device; the cascading circuit operable to generate a tamper detection signal if the signal indicating that the corresponding component has moved is received at the first input or if another tamper detection signal generated by the other intrusion detection device is received at the second input. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An intrusion detection system, comprising:
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a first magnetic device coupled to a first component and operable to produce a first magnetic field; a second magnetic device coupled to a second component and operable to produce a second magnetic field; a first intrusion detection device positioned proximate to the first magnetic device, the first intrusion detection device operable to detect the first magnetic field of the first magnetic device and in response to a change in the first magnetic field, generate a first tamper detection signal; a second intrusion detection device positioned proximate to the second magnetic device, the second intrusion detection device operable to; receive the first tamper detection signal; detect the second magnetic field of the second magnetic device; and generate a second tamper detection signal in response to either receiving the first tamper detection signal or a change in the second magnetic field of the second magnetic device; and an intrusion detection supervisory system operable to receive the second tamper detection signal generated by the second intrusion detection device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An intrusion detection method, comprising:
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producing, by a first magnetic device coupled to a first component, a first magnetic field; producing, by a second magnetic device coupled to a second component, a second magnetic field; generating, by a first intrusion detection device positioned proximate to the first magnetic device, a first tamper detection signal in response to a change in the first magnetic field of the first magnetic device; receiving, by a second intrusion detection device positioned proximate to the second magnetic device, the first tamper detection signal; detecting, by the second intrusion detection device, a change in the second magnetic field of the second magnetic device; generating, by the second intrusion detection device, a second tamper detection signal in response to either receiving the first tamper detection signal or detecting a change in the second magnetic field of the second magnetic device; and receiving, at an intrusion detection supervisory system, the second tamper detection signal generated by the second intrusion detection device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification