Integrating passive infrared intrusion detector
First Claim
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1. A passive infrared intrusion detection system to be connected to an alarm, comprising:
- collecting means for collecting infrared rays having an intensity from a plurality of optically divided detection zones of an area to be monitored;
detector means for passively detecting said infrared rays collected by said collecting means;
generating means for generating a signal proportional to the intensity of said infrared rays collected by said collecting means;
integration means for integrating said signal to produce an integral sum, and for generating an output signal when the integral sum produced by said integration means during an integration period exceeds a preset value; and
alarm activating means for activating said alarm in response to said output signal of said integration means.
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Abstract
In a passive infrared intrusion detection system, a signal responsive to infrared radiation received from optically divided zones of an area to be monitored is integrated to produce an integral sum. The integral sum is used to generate an alarm indication. The alarm indication is thereby responsive to the energy of the signal responsive to the infrared radiation received, thus improving sensitivity of the detection system without increasing susceptibility of generating a false alarm.
54 Citations
20 Claims
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1. A passive infrared intrusion detection system to be connected to an alarm, comprising:
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collecting means for collecting infrared rays having an intensity from a plurality of optically divided detection zones of an area to be monitored; detector means for passively detecting said infrared rays collected by said collecting means; generating means for generating a signal proportional to the intensity of said infrared rays collected by said collecting means; integration means for integrating said signal to produce an integral sum, and for generating an output signal when the integral sum produced by said integration means during an integration period exceeds a preset value; and alarm activating means for activating said alarm in response to said output signal of said integration means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of passive infrared intrusion detection, comprising the steps of:
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a) collecting infrared rays having an intensity from a plurality of optically divided detection zones of an area to be monitored; b) detecting said infrared rays collected in step (a); c) generating a signal proportional to the intensity of said infrared rays detected in step (b); d) integrating said signal during an integration period to produce an integral sum; e) generating an output signal when the integral sum in step (d) exceeds a preset value; f) activating an alarm in response to said output signal generated in step (e). - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification