Intrusion detection system including over-under passive infrared optics and a microwave transceiver
First Claim
1. An intrusion detection system comprising:
- a microwave transceiver configured to detect motion in a protected space, said microwave transceiver generating a first signal;
a first infrared sensor configured to detect a source of infrared energy in a plurality of upper detection zones within the protected space, said first infrared sensor generating an upper sensor signal;
a second infrared sensor configured to detect a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space and intersecting a floor surface within the protected space, the second infrared sensor generating a lower sensor signal; and
a processor configured to receive the first signal, the upper sensor signal and the lower sensor signal, said processor being configured to generate an alarm signal in response to the first signal exceeding a threshold value, the threshold value being varied in response to a relationship between the lower sensor signal and the upper sensor signal.
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Accused Products
Abstract
An intrusion detection system includes a microwave transceiver detecting motion in a protected space. The microwave transceiver generates a first signal. A first infrared sensor detects a source of infrared energy in a plurality of upper detection zones within the protected space. The first infrared sensor generates an upper sensor signal. A second infrared sensor detects a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space and intersecting a floor surface within the protected space. The second infrared sensor generates a lower sensor signal. A processor receives the first signal, the upper sensor signal and the lower sensor signal. The processor generates an alarm signal in response to the first signal exceeding a threshold value. The threshold value is varied in response a relationship between the lower sensor signal and the upper sensor signal.
52 Citations
25 Claims
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1. An intrusion detection system comprising:
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a microwave transceiver configured to detect motion in a protected space, said microwave transceiver generating a first signal;
a first infrared sensor configured to detect a source of infrared energy in a plurality of upper detection zones within the protected space, said first infrared sensor generating an upper sensor signal;
a second infrared sensor configured to detect a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space and intersecting a floor surface within the protected space, the second infrared sensor generating a lower sensor signal; and
a processor configured to receive the first signal, the upper sensor signal and the lower sensor signal, said processor being configured to generate an alarm signal in response to the first signal exceeding a threshold value, the threshold value being varied in response to a relationship between the lower sensor signal and the upper sensor signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An intrusion detection system comprising:
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a microwave transceiver configured to detect motion in a protected space, said microwave transceiver generating a first signal;
a first infrared sensor configured to detect a source of infrared energy in a plurality of upper detection zones within the protected space, said first infrared sensor generating an upper sensor signal;
a second infrared sensor configured to detect a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space, the second infrared sensor generating a lower sensor signal; and
a processor configured to receive the first signal, the upper sensor signal and the lower sensor signal, said processor being configured to generate an alarm signal in response to the first signal crossing a threshold value a required number of times within a time period, at least one of the required number and the time period being varied in response to a relationship between the lower sensor signal and the upper sensor signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An intrusion detection system comprising:
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a microwave transceiver configured to detect motion in a protected space, said microwave transceiver generating a first signal having a characteristic;
a first infrared sensor configured to detect a source of infrared energy in a plurality of upper detection zones within the protected space, said first infrared sensor generating an upper sensor signal;
a second infrared sensor configured to detect a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space, the second infrared sensor generating a lower sensor signal; and
a processor configured to receive the first signal, the upper sensor signal and the lower sensor signal, said processor being configured to generate an alarm signal in response to the characteristic of the first signal exceeding a threshold value, the threshold value varying in response to a relationship between the lower sensor signal and the upper sensor signal. - View Dependent Claims (18, 19, 20, 21, 22)
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23. An intrusion detection system comprising:
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a microwave transceiver configured to detect motion in a protected space, said microwave transceiver generating a first signal;
a first infrared sensor configured to detect a source of infrared energy in a plurality of upper detection zones within the protected space, said first infrared sensor generating an upper sensor signal; and
a processor configured to receive the first signal and the upper sensor signal and generate an alarm signal when the first signal exceeds a variable threshold value wherein said variable threshold value has a maximum value when said upper sensor signal indicates the absence of a infrared energy source in said upper detection zones and, when said upper sensor signal indicates the presence of infrared energy source in said upper detection zone, said variable threshold value is decreased as said upper sensor signal decreases. - View Dependent Claims (24, 25)
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Specification