RE: PIR blocker ?

["Paul Gordon" <paul@xxxxxxxxxxxxxxxxxxxxx>]

Absolutely impossible, I'd have thought...

The "P" in "PIR" is for "Passive"... - these
devices do not emit any kind o=
f signal, - they are detectors only... - they detect infra-red radiation
gi=
ven off by warm bodies.

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 spe=
cific IR signal that it is looking for from the TV's remote..

Therefore, I would suggest, that if you pointed one of these jammers at a
P=
IR, rather than "blocking" the PIR, it would actually send it
detecting lik=
e mad! - depends quite a bit on the wavelengths if the IR radiation in
ques=
tion though... Humans emit IR in the 9-10 micrometer wavelength, so PIR's
t=
ypically have a detection range around 8-12 micrometers... - I don't know
i=
f consumer IR is in this same part of the spectrum... - someone else can
ha=
ve a go at answering that...

Paul G.
=20

> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]=20
> On Behalf Of noughtomate
> Sent: 12 May 2006 11:29
> To: UKHA_D Group
> Subject: [ukha_d] PIR blocker ?
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> Hi,
>=20
> Just read about this Infrared blocker.
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> http://www.remoteshoppe.com/index.php?itemid=3D166
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> Novelty aside, I'm just concerned that such a device could be use
to=20
> by pass Infrared detectors.
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> Is the IR technology the same or am I paniced over nothing ?
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