On Fri, 23 Jul 1999 08:50:10 -0400 (EDT) Jerry Wayne Decker
<jwdatwork@yahoo.com> writes:
> Hi John et al!
<chop>
> Chuck Shramek, the guy with the aura photographs used
> such a single point detector but was not pleased with
> all the samples that had to be manually collected to
> 'paint' a 2D (x,y) image. That is why he came up with
> the CCD that would pick up the modulated tesla coil
> emissions and instantly paint a scanned image.
<chop>
> The images he gets are from various duration
> exposures, which show up as gray scale images to which
> he then applies a color map based on the intensity of
> the gray.
My "understanding" of CCD light sensors is that there is a matrix
of little capacitors that are sequentially charged and read repeatedly,
much the same as dynamic "ram" is.
I am having a problem with the idea of "various duration exposures".
These little capacitors can only hold their charge for small fraction of
a second and consequently the "read-and-recharge" rate can only be
slowed down to some minimum rate. I think the difference between
"normal" factory preset exposure and the maximum exposure is only
a matter of microseconds? milliseconds?
Then, of course, which brand and model of CCD allows external
timing control??
I want one.
Be Well All,
David
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