Passive infrared intrusion detector
First Claim
1. An intrusion detector for supervising a region comprising:
- a sensor which views a plurality of fields-of-view of the region and provides an output responsive to motion of an infrared radiation source between the fields-of-view;
a first filter which provides a first filtered output based on a first, predetermined, detection pulse frequency range of the sensor output;
a second filter which provides a second filtered output based on a second, predetermined, detection pulse frequency range of the sensor output; and
processing circuitry which receives the first and second filtered outputs and detects in at least one of the filtered outputs, a sequence of at least a predetermined number of detection pulses indicating an intrusion condition.
2 Assignments
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Accused Products
Abstract
An intrusion detector for supervising a region including a sensor which views a plurality of fields-of-view of the region and provides an output responsive to motion of an infrared radiation source between the fields-of-view, a first filter which provides a first filtered output based on a first, predetermined, detection pulse frequency range of the sensor output, a second filter which provides a second filtered output based on a second, predetermined, detection pulse frequency range of the sensor output and processing circuitry which receives the first and second filtered outputs and detects, in either or both of the filtered outputs, a sequence of detection pulses indicating an intrusion condition.
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Citations
35 Claims
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1. An intrusion detector for supervising a region comprising:
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a sensor which views a plurality of fields-of-view of the region and provides an output responsive to motion of an infrared radiation source between the fields-of-view; a first filter which provides a first filtered output based on a first, predetermined, detection pulse frequency range of the sensor output; a second filter which provides a second filtered output based on a second, predetermined, detection pulse frequency range of the sensor output; and processing circuitry which receives the first and second filtered outputs and detects in at least one of the filtered outputs, a sequence of at least a predetermined number of detection pulses indicating an intrusion condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of supervising a region, comprising:
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viewing a plurality of fields-of-view of the region; sensing incident infrared radiation from the region and providing a single sensor signal responsive to motion of an infrared radiation source between the fields-of-view; detecting a series of extremum values in the sensor signal; and detecting motion of the infrared radiation source based on time and amplitude differences between at least some of the extremum values in said series. - View Dependent Claims (25, 26, 27)
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28. An intrusion detector for supervising a region comprising:
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a sensor which views a plurality of fields-of-view of the region and provides a single output responsive to motion of an infrared radiation source between the fields-of-view; a processor which detects a series of extremum values in the sensor output and determines motion of the infrared radiation source based on time and amplitude differences between at least some of the extremum values in said series. - View Dependent Claims (29, 30)
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31. An intrusion detector for supervising a region comprising:
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a sensor which views a plurality of fields-of-view of the region and provides an output responsive to motion of an infrared radiation source between the fields-of-view; a first filter which provides a first filtered output based on a first, predetermined, detection pulse frequency range of the sensor output; a second filter which provides a second filtered output based on a second, predetermined, detection pulse frequency range of the sensor output; and processing circuitry which receives the first and second filtered outputs and detects in either or both of the filtered outputs, a sequence of detection pulses indicating an intrusion condition, wherein the first frequency range is between about 3 Hz to about 10 Hz. - View Dependent Claims (32, 33, 34)
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35. An intrusion detector for supervising a region comprising:
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a sensor which views a plurality of fields-of-view of the region and provides an output responsive to motion of an infrared radiation source between the fields-of-view; a first filter which provides a first filtered output based on a first, predetermined, detection pulse frequency range of the sensor output; a second filter which provides a second filtered output based on a second, predetermined, detection pulse frequency range of the sensor output; and processing circuitry which receives the first and second filtered outputs and detects in either or both of the filtered outputs, a sequence of detection pulses indicating an intrusion condition, wherein the second frequency range is between about 0.1 Hz to about 3 Hz.
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Specification