Man from beast ? By their weight difference ! The more mass, the more
infrared density emission.



----- Original Message -----
From: Simon Ethier <Seth889@STARTREKMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, February 27, 2001 4:12 PM
Subject: Re: [EE]: Infrared Detector vs Pet


> Humm, I don't think so ... What for the cat that climb on the sofa, or on
a
> bookshelf ?
>
> hehe
>
> ----- Original Message -----
> From: "James Paul" <jim@JPES.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Tuesday, February 27, 2001 1:33 PM
> Subject: Re: [EE]: Infrared Detector vs Pet
>
>
> > Justin,
> >
> >  Typically I believe the way these things discriminate between man
> >  and beast is that they aim the devices so that the bottom of the
> >  cone of coverage is about 2-3 feet off the floor.   That way, most
> >  house pets won't set off the alarm because it is not within the
> >  transmitted beam.   However, humans, being substantially taller
> >  than most house pets, is within the beam, and does set off the
> >  alarm.
> >
> >                                           Regards,
> >
> >                                             Jim
> >
> >
> >
> >
> >
> >
> >
> >
> > On Tue, 27 February 2001, Justin Fielding wrote:
> >
> > >
> > > Lookup pyrometers, they may be a good way to do this as you could
adjust
> the
> > > sensitivity.  They actually work by detecting movement of body heat
 I
> > > think).  With an IR beam it is all or nothing,
> > >
> > >
> > > ----- Original Message -----
> > > From: "Simon Ethier" <Seth889@STARTREKMAIL.COM>
> > > To: <PICLIST@MITVMA.MIT.EDU>
> > > Sent: Tuesday, February 27, 2001 5:21 PM
> > > Subject: Re: [EE]: Infrared Detector vs Pet
> > >
> > >
> > > > I don't really know ... All I'd like to do is build a cheap but
> effective
> > > > "IR" detector that do not triggers with pets like cats ...
> > > >
> > > > Thanks
> > > >
> > > > ----- Original Message -----
> > > > From: "Justin Fielding" <j.fielding@BTINTERNET.COM>
> > > > To: <PICLIST@MITVMA.MIT.EDU>
> > > > Sent: Tuesday, February 27, 2001 11:59 AM
> > > > Subject: Re: [EE]: Infrared Detector vs Pet
> > > >
> > > >
> > > > > I assume that you are talking about IRbeams (which must be broken
to
> > > > trigger
> > > > > alarm) rather than a PIR detector (using a pyrometer).
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Simon Ethier" <Seth889@STARTREKMAIL.COM>
> > > > > To: <PICLIST@MITVMA.MIT.EDU>
> > > > > Sent: Tuesday, February 27, 2001 4:07 PM
> > > > > Subject: [EE]: Infrared Detector vs Pet
> > > > >
> > > > >
> > > > > Hi, I'm wondering.. I heard in a publicity of an alarm company
that
> they
> > > > > have an infrared detecter which can make the difference between
pet
> and
> > > > > human (how, I don't know ... ok it don't really "make" the
> difference,
> > > but
> > > > > the IR won't react to a cat for exemple, but will react to a
human)
> I
> > > > found
> > > > > this very cool, especially if you have pet at your house...
> > > > >
> > > > > I'd like to build something like that ... Do any of you guys know
> what
> > > is
> > > > > the trick ?  Is it less sensitive ? Does it require a minimum of
> > > movement
> > > > > ...
> > > > >
> > > > > Thanks
> > > > > ---
> > > > > Simon Ethier
> > > > > sethier@justine.umontreal.ca
> > > > > ICQ 66019153
> > > > >
> > > > > --
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> > jim@jpes.com
> >
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