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From: email@example.com (Don Klipstein)
Subject: Re: Infrared led tester
Date: Mon, 23 Dec 2002 04:03:29 +0000 (UTC)
Organization: MGT Consulting
NNTP-Posting-Date: Mon, 23 Dec 2002 04:03:29 +0000 (UTC)
User-Agent: slrn/0.9.6.3 (SunOS)
In , Spehro Pefhany wrote:
>On Thu, 19 Dec 2002 18:40:55 +0000, the renowned John Woodgate
>>If you need to 'see' the IR output, many video cameras are sensitive to
>FWIW, I just tried it quickly with a digital still camera and it
>didn't work very well, if at all.
I have found my digital still camera to have spectral response closer to
that of the human eye than the spectral response that I have heard many
video cameras have.
I am afraid some modern video cameras may have the more human-eye-like
spectral response nowadays.
Cheaper black-and-white security cameras seem to reallyu like IR
however. Some color video cameras are famous for their ability to see IR.
Some digital still cameras see IR just well enough that with a
diffraction grating (like the blanks that come with some stacks of CDRs)
it shows a spectrum visibly including an IR band that a few models of one
brand of ultrabright yellow LED had.
Otherwise, try that Radio Shack card with the orange square or
orange end (276-1099) or a phototransistor (put in series with a
milliammeter and a DC power supply of a few volts, collector is usually
positive) or a silicon solar cell (connect to a milliammeter).
- Don Klipstein (firstname.lastname@example.org)
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