Subject:
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Re: colour sensor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 27 Jan 2000 14:49:42 GMT
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Original-From:
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(FThompson9@aol)spamless(.com)
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Viewed:
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1121 times
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I would suggest that the sensors are picking up IR. I would wager that
your color filters are passing the IR with little attenuation and that your
sensors are peaked in the IR region and little affected by the visible color
information.
If you have access to a CCD Camcorder, and an IR LED you can play with
the filters a little. I think most CCD Camcorders are sensitive to IR. Look
at the IR LED through the camera to see if you can see it glowing. If so,
then place the color filter in the path to see how much the IR light is
attenuated.
I have recently done some experiments (color enlarger) with CdS cells and
found that I can change their response using RGB color filters. I believe
they are also sensitive to IR and UV, but they are substantially influenced
by visible light, enough to show a difference when different color filters
are introduced.
American Science Surplus (Jerry Co.) recently advertised some large ones
for a good price:
http://www.sciplus.com/
Good Luck,
Pherd
Pensacola, FL
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