RE: PIR blocker ?

["Paul Gordon" <paul@xxxxxxxxxxxxxxxxxxxxx>]

I seem to recall this was a plot device in some film from the 80's -
"Hacke=
rs" was it? - It had Ben Kingsley in it..

The character was allegedly able to move around in the room by wearing a
ne=
oprene wetsuit and moving very slowly...

Paul G.
=20

> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]=20
> On Behalf Of Paul Gale
> Sent: 12 May 2006 12:35
> To: UKHA_D Group
> Subject: RE: [ukha_d] PIR blocker ?
>=20
> I've always wondered if someone could put a blanket over=20
> themselves (at the same temp as the room) and walk around=20
> unnoticed by the PIR!
>=20
> Maybe I'll give it a try when I have nothing else to do ;)
>=20
> Paul.
>=20
>=20
>=20
> > -----Original Message-----
> > From: ukha_d@xxxxxxx=20
> [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 ?
> >=20
> > Absolutely impossible, I'd have thought...
> >=20
> > The "P" in "PIR" is for
"Passive"... - these devices do not=20
> emit any kind
> > of signal, - they are detectors only... - they detect=20
> infra-red radiation
> > given off by warm bodies.
> >=20
> > These "jammers" work by flooding the TV's IR reciever
with=20
> a very strong
> > IR signal that swamps it and stops it from being able to=20
> discriminate the
> > specific IR signal that it is looking for from the TV's remote..
> >=20
> > Therefore, I would suggest, that if you pointed one of=20
> these jammers at a
> > PIR, rather than "blocking" the PIR, it would actually
send=20
> it detecting
> > like mad! - depends quite a bit on the wavelengths if the=20
> IR radiation in
> > question though... Humans emit IR in the 9-10 micrometer=20
> wavelength, so
> > PIR's typically have a detection range around 8-12=20
> 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...
> >=20
> > Paul G.
> >=20
> >=20
> > > -----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=20
> could be use to
> > > by pass Infrared detectors.
> > >
> > > Is the IR technology the same or am I paniced over nothing ?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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