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From: Tony Williams
Subject: Re: transmission of infrared through water
Date: Mon, 09 Dec 2002 11:54:12 +0000 (GMT)
References: <email@example.com> <4PMG9.firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Mon, 9 Dec 2002 13:07:29 +0000 (UTC)
User-Agent: Pluto/1.14i (RISC-OS/3.60)
In article ,
Glen Walpert wrote:
> I missed the start of this thread and don't know what
> you are trying to do,
It comes from a remark in another thread Glen, which
was off-topic, so moved to this new thread.
I remarked on stability probs encountered when using
near-IR LEDs as the light source when trying to measure
the turbidity of water. The cause later found to be
due to absorption notches in water, in the 850-950nm
region (together with IR LEDs drifting at about 0.3nm/C).
Win asked for some documentary evidence of the notches.
Since my probs were in 1982 I had nothing left to hand,
so other posters kindly gave useful pointers.
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