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From: Winfield Hill
Subject: Re: transmission of infrared through water
Date: 7 Dec 2002 04:29:26 -0800
Organization: Rowland Institute
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Tony Williams wrote...
> Winfield Hill wrote:
>> Poking around on the web I found a few bits and pieces...
> For ref, I started the job with the old Fairchild FPE104
> which was 890nm, but that went obsolete. The only
> reasonable alternatives were high power IR LEDs intended
> for remote control, and they were all in the 950nm region.
> The various graphs in those docs suggest that 950nm was
> the worst IR wavelength to use through water.
Indeed. I found useful in your comments your use of an
incandescent light source and your suggestion for using
a through-the-water reference channel.
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