INFRA-RED INTRUDER DETECTION SYSTEM

An infra-red intruder detection system has two separate channels A and B each having its own pyroelectric detector device (10A, 10B) and threshold level comparators (22A, 23A, 22B, 23B) responsive to dual polarity pyroelectric voltage outputs produced by the associated detector device as a result of...

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Hauptverfasser:	ROSE, MICHAEL ANDREW, KIDSON, PAUL
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS
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creator	ROSE, MICHAEL ANDREW KIDSON, PAUL
description	An infra-red intruder detection system has two separate channels A and B each having its own pyroelectric detector device (10A, 10B) and threshold level comparators (22A, 23A, 22B, 23B) responsive to dual polarity pyroelectric voltage outputs produced by the associated detector device as a result of an intruder-related infra-red image moving thereacross. A logic circuit (25) analyses the comparator outputs and responds to the identification of particular intruder-indicative sequences of comparator outputs in both channels to generate an alarm and/or switching output (27). The logic circuit may also identify shock-induced comparator outputs. The system offers a high intruder detection capability with immunity from false triggering.
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A logic circuit (25) analyses the comparator outputs and responds to the identification of particular intruder-indicative sequences of comparator outputs in both channels to generate an alarm and/or switching output (27). The logic circuit may also identify shock-induced comparator outputs. The system offers a high intruder detection capability with immunity from false triggering.</description><language>eng</language><subject>ALARM SYSTEMS ; ORDER TELEGRAPHS ; PHYSICS ; SIGNALLING ; SIGNALLING OR CALLING SYSTEMS</subject><creationdate>1991</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19910821&DB=EPODOC&CC=EP&NR=0198551B1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25544,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19910821&DB=EPODOC&CC=EP&NR=0198551B1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ROSE, MICHAEL ANDREW</creatorcontrib><creatorcontrib>KIDSON, PAUL</creatorcontrib><title>INFRA-RED INTRUDER DETECTION SYSTEM</title><description>An infra-red intruder detection system has two separate channels A and B each having its own pyroelectric detector device (10A, 10B) and threshold level comparators (22A, 23A, 22B, 23B) responsive to dual polarity pyroelectric voltage outputs produced by the associated detector device as a result of an intruder-related infra-red image moving thereacross. 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subjects	ALARM SYSTEMS ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS
title	INFRA-RED INTRUDER DETECTION SYSTEM
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