From: <Eugene.Leitl@lrz.uni-muenchen.de>, Fri, 1 Dec 2000
>In theory, you could use a filter function which smoothly
>changes over time (moving a narrow window over your bell-shaped
>curve), giving you a kind of time-multiplexed multispectral
>vision. You would perceive that as an object smoothly changing hue,
>highlighting some areas which you wouldn't be ordinarily able to
>resolve.
One could really get wild with this: filters to emphasize edges,
filters to emphasize or remove transients, catch chirps,
amplitude-modulations, frequency-modulations ...
>For instance, it is trivial to distinguish incandescents
>and fluorescents using a common CD as a makeshift diffraction grating,
>if you can't lay your hands on a real diffraction grating (which are
>speciality items, and hence expensive. You might fish around in the
>trash bin of your local research institute, and salvage one from an
>old spectrophotometer, or something. Or order one from Edmund Optics,
>if you're feeling particularly enterprising).
The Edmund Scientific defraction gratings are specialty items? It
depends on the quality desired, yes? They can be incredibly cheap
(a few bucks maybe? I don't have a catalog here to check.).
Several years ago several colleagues and I were entertaining a class
of 15 10-year-old kids with spectrometer games- showing them
the emission lines seen looking through diffraction gratings when held up
in front of helium lamps, hydrogen lamps, sodium lamps, etc.
We ran out of our Edmund Scientific gratings, so we brought out a handful
of CD's for the kids to use as diffraction gratings. As you say above:
The CDs worked great.
Amara
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Amara Graps email: amara@amara.com
Computational Physics vita: finger agraps@shell5.ba.best.com
Multiplex Answers URL: http://www.amara.com/
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"Sometimes I think I understand everything. Then I regain
consciousness." --Ashleigh Brilliant
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