Rich,
Where do you get these 'H2O band' IR band pass filters ? I've played
with
Gelatin filters, Dichroacs , AR Coated lenses etc , But never got to lay
My hands on anything IR.

Jeethu Rao

> -----Original Message-----
> From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]
> On Behalf Of Rich
> Sent: Monday, November 04, 2002 9:56 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]:Infra-red Opto help
>
> There is a H2O peak in the IR band not far from the CO2 peak.  An
optical
> band pass filter at this nm range would detect the moisture from the
rain.
> It is a good humidity detector as well as a rain detector.  I have
built
> such devices years ago.  It is easy to look up the IR spectrum for the
H2O
> Peaks and choose the best one.  The detector sensitivity is also
> important.
>
> Richard
>
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