> It is possible to do a spectrographic scanner. As a first cut, take an
> ordinary scanner, replace the fluorescant tube with some sort of light
> that emits over a wider spectrum. Now, replace the linear imaging
> array with a square one, and stick a diffraction grating in the
> optical path.
You need a lot of light to do that. To get an N sample-per-pixel scan,
you need at least N times as much light. You may be able to get step the
line more slowly (let the CCD integrate over a longer period of time) but
limits to patience may come into play.
We have experience making cameras that have multiple sensors, with the
image split by a beam splitter, and the simple quantity of available
light quickly becomes a limiting factor.
-- Steve Williams "The woods are lovely, dark and deep. email@example.com But I have promises to keep, firstname.lastname@example.org and lines to code before I sleep, http://www.picturel.com And lines to code before I sleep."
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