Re: White spots

[ADavidhazy <ANDPPH@xxxxxxxxxxxxxxxxxx>]

Chuck,

> lenses?  I am taking apart a CCD line scanner used for copying today and
> replacing the glass with plastic to see what a scan of my hand would look
> like.Of couse, all this may be off the subject since my interest is in seeing
> microvascular circulation in medical applications that are related to it.
> It would be great if a $200.00 scanner could provide useful information on the
> circulation system...a dream.  Chuck

I would like to suggest that it is probably not the glass platen that prevents
IR from being detected by the scanner's sensor but rather a small IR abosrbing
filter placed or installed in the "imaging funnel" of the scanner ... just in
front of the lens assembly.

I have made quite satisfactory IR images by taking the scanning array out of a
hand scanner and placing it in the back of a 35mm camera. In the process the IR
blocking filter was, of course, left behind. Now the array is exposed to IR
rays and unless one has a light source low in IR output (such as most
fluorescent tubes) the image is not the best ... unless one uses a IR absorbing
filter on the lens! But the scanner can make IR records quite easily!

Example at: http://www.rit.edu/~andpph/text-better-scanner-cam.html

Andrew  o o  0 0 o . o  Davidhazy, Imaging and Photo Tech
         \/\/\/\/\/\/          http://www.rit.edu/~andpph
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