SCOUG-Programming Mailing List Archives

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Date:	Fri, 21 May 1999 22:17:04 PDT
From:	"Benedict G Archer" <bgarcher@beckman.com >
Reply-To:	scoug-programming@scoug.com
To:	scoug-programming@scoug.com
Subject:	SCOUG-Programming: #5

Content Type: text/plain

That's funny, Ben. :))

Have you decided which cards you want the driver to control?

- Peter

Peter,
Most of the cards I've used were from Data Translation. Their
documentation seems good, but I don't know whether I could get driver
sources. I haven't used any National Instruments hardware. I would
probably inquire with DT and some other, smaller suppliers to see where I
could get cards meeting requirements and with the best information--there
are at least a few. One source is Lawson Labs in Kalispell, MT. The specs
on their cards are good and prices lower than just about anywhere else.
And since they are domestic and seem small, the likelihood of resposes to
special requests (like driver sources) may be good. (These impressions are
at least a year old.)
You and Steven were giving me information a lot faster than I can act on
it. This is not a project I can tackle tomorrow; I intend to do it, but
unfortunately, I can not give it any sustained, significant time just now.
But if you had an interest in this particular area, I could be more
specific about hardware.
You asked about the sensors--linear diode arrays read out via a shift
register, sometimes at significant rates, e.g., 256 element arrays scanned
at 256 Hz. CCD's, at least as I've used them, also read out as linear
devices as the pixel charges are shifted parallel off the array in one
dimension into a linear readout array in the second dimension. With CCD's
the data rates can get a lot higher, but the requirements for digital
resolution are lower because the pixel charge capacities are so small.
Respectable CCDs are now quite cheap, making formerly "out of reach"
experiments and tinkering now feasible. If only I had the time. I'll dig
up what info I might have on a DT card.

Ben

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