Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucsd!brian
From: brian@ucsd.Edu (Brian Kantor)
Newsgroups: sci.electronics
Subject: Re: Seeing in the dark (sort of)
Message-ID: <10190@ucsd.Edu>
Date: 27 Nov 89 17:08:15 GMT
References: <1018@ariel.unm.edu> <2663@sol.oakhill.UUCP>
Reply-To: brian@ucsd.edu (Brian Kantor)
Organization: The Avant-Garde of the Now, Ltd.
Lines: 5

IR sensors for alarm systems are often available in a version which does
not operate its signalling contacts until it has been tripped multiple
times.  That is the kind we have around here; they do trip when people
walk past them but do NOT trip from glints of sunlight off windshields,
flashbulbs, etc.


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