Re: PIR through glass

["Matthew Norman" <mafiu@xxxxxxx>]

Thanks guys - saves an unwise spend.

Matthew

----- Original Message -----
From: "Dan" <dtoma@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, April 09, 2003 10:40 AM
Subject: Re: [ukha_d] PIR through glass


> You can use a proximity senzor (radar based), like the one used in
cars.
> I have one of these and it works even behind a wood door.
> It is connected to the alarm system too.
>
> Dan
> ----- Original Message -----
> From: "Ward, David" <David.Ward@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Wednesday, April 09, 2003 12:21 PM
> Subject: RE: [ukha_d] PIR through glass
>
>
> > Sorry Matthew,  IR at that wavelength is mostly reflected by
glass.
> > You need to use an external PIR or another sensor technology.
> >
> > Dave
> >
> > -----Original Message-----
> > From: Matthew Norman [mailto:mafiu@xxxxxxx]
> > Sent: Wednesday, April 09, 2003 10:04 AM
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] PIR through glass
> >
> >
> > Does PIR work through glass?
> >
> > I want to create a welcome light at the front door that turns the
internal
> > lights on in the porch before I unlock the door.
> >
> > I thought I could pop a x10 pir behind the glass so that when
someone
came
> > to the door and started fumbling with keys the light came on. 
Would
this
> > work?  I want the effect to be contained and not to trigger when
people
> walk
> > passed the end of the path like other external PIRs which then
blind any
> > passers by.
> >
> > Just wondering.
> >
> > Matthew
> >
> >
> >
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