RE: PIR blocker ?

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

I've always wondered if someone could put a blanket over themselves
(at the=
same temp as the room) and walk around unnoticed by the PIR!

Maybe I'll give it a try when I have nothing else to do ;)

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
> Paul Gordon
> Sent: 12 May 2006 12:31
> To: UKHA_D Group
> Subject: RE: [ukha_d] PIR blocker ?
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> Absolutely impossible, I'd have thought...
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> The "P" in "PIR" is for "Passive"... -
these devices do not emit any kind
> of signal, - they are detectors only... - they detect infra-red
radiation
> given off by warm bodies.
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> These "jammers" work by flooding the TV's IR reciever with a
very strong
> IR signal that swamps it and stops it from being able to discriminate
the
> specific IR signal that it is looking for from the TV's remote..
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> Therefore, I would suggest, that if you pointed one of these jammers
at a
> PIR, rather than "blocking" the PIR, it would actually send
it detecting
> like mad! - depends quite a bit on the wavelengths if the IR radiation
in
> question though... Humans emit IR in the 9-10 micrometer wavelength,
so
> PIR's typically have a detection range around 8-12 micrometers... - I
> don't know if consumer IR is in this same part of the spectrum... -
> someone else can have a go at answering that...
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> Paul G.
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> > -----Original Message-----
> > From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]
> > On Behalf Of noughtomate
> > Sent: 12 May 2006 11:29
> > To: UKHA_D Group
> > Subject: [ukha_d] PIR blocker ?
> >
> > Hi,
> >
> > Just read about this Infrared blocker.
> >
> > http://www.remoteshoppe.com/index.php?itemid=3D166
> >
> > Novelty aside, I'm just concerned that such a device could be use
to
> > by pass Infrared detectors.
> >
> > Is the IR technology the same or am I paniced over nothing ?
> >
> >
> >
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