Re: IR meter

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From: Sil Horwitz (silh@earthlink.net)
Date: 02/02/00-11:47:11 AM Z

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In reply to: David J. Romano: "IR meter"

At 2000/02/02 08:46 AM -0500, you wrote:
>Building an IR meter is quite simple.
>The parts are:
>
>Radio shack project case
>Radio shack needle indicator voltmeter
>Photoconductive cell, Cds or Si
>Radio shck temporary on/off push button switch
>Battery, 1.5V, 3V or 9V

The problem is that CdS or Si (Silicon) have very little response to
InfraRed, and can be quite inaccurate in that area. The photoconductor of
choice is PbS, which is often available from surplus sources. These cells
are IR specific.

Sil Horwitz, FPSA
Technical Editor, PSA Journal
teched@psa-photo.org
silh@earthlink.net
Visit http://www.psa-photo.org/
Personal page: http://home.earthlink.net/~silh/

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