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KB2VXA > LIGHT 19.11.05 15:37l 38 Lines 1427 Bytes #999 (0) @ WW
BID : 45516_NJ2AR
Read: GUEST DO1EH
Subj: Re: G6URM > IR and beyond
Path: DB0FHN<DB0MRW<DB0ERF<DB0ROF<DB0ACH<ON0DXC<WA7V<N1URO<K2PUT<WB2QJA<
KC2COJ<NJ2AR
Sent: 051119/1208Z @:NJ2AR.#CNJ.NJ.USA.NOAM #:45516 [Lakehurst] $:45516_NJ2AR
From: KB2VXA@NJ2AR.#CNJ.NJ.USA.NOAM
To : LIGHT@WW
Hi Brett and all,
I'm far from the scientist but here goes based on the best of my
knowlege. How would one go about designing a variable filter? It seems to
me if it were possible using current technology we'd already have them.
Current ones are what may be called fixed LP, HP and BP filters.
The sensor matrix in a video or digital camera is much like film inasmuch
as it is most sensitive to only a small portion of the spectrum which is
what makes them useful. If they were broad spectrum we'd have a world of
trouble with external filtering which is what further narrows the
spectrum. Too much is too much, imagine your confusion if you had broad
spectrum eyes.
The bandpass of a polarizing filter is largely dependent on it's
substrate material, width and spacing of the grid lines. I haven't
checked any scientific catalogs lately, one specializing in optics would
be most helpful unless someone in the biz happens to read these bulls.
You'd be surprised what an on line search engine can turn up, "optics"
would be a good place to start.
73 de Warren, KB2VXA@NJ2AR.#CNJ.NJ.USA.NOAM
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