Re: PIR blocker ?

["Andy Davies" <dajdavies@xxxxxxxxx>]

What about one of those reflective blankets you see them in at the end
of
the London Marathon?

On 12/05/06, Paul Gale <groups@xxxxxxx> wrote:
>
> 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 ?
> >
> > Absolutely impossible, I'd have thought...
> >
> > 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.
> >
> > These "jammers" work by flooding the TV's IR reciever
with a very stron=
g
> > 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..
> >
> > 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 detectin=
g
> > 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...
> >
> > Paul G.
> >
> >
> > > -----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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