| Re: Realtime in PV-Wave [message #1235 is a reply to message #1233] |
Sun, 20 June 1993 19:20  |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <18JUN199312401085@mars.lerc.nasa.gov> uubrian@mars.lerc.nasa.gov (Brian Bentz) writes:
> Hi everyone,
>
> I'm very new to the group, so I'm not up on what's been discussed
> in the past. However, I'm working on doing some real-time work with
> PV-Wave. I'm curious who all out here on the group have done this kind
> of thing, and what they've done with it. I'm looking for some ideas,(and
> frankly, someone to ask questions because I'm still fairly new to wave
> anyway) Feel free to post, (or write, if this is such an old topic that
> nobody wants to see it anymore) Thanks!
>
> Brian
> --
> Brian Bentz, Summer Intern
> NASA Lewis Research Center
> MS 142-2
> Cleveland, OH 44135
>
We have been using IDL for real-time data collection for several years
now. The applications include a soft-xray scanning microscope with
real-time image display, a hard-xray trace element microprobe and a
microtomography system.
All of these applications use the CALL_EXTERNAL procedure to call routines
written in other languages (Fortran or C) which actually collect the
data. Structures and arrays are passed to/from IDL to control the data
acqusition and to pass the results back. Most of the applications use
the widget toolkit to build point and click IDL interfaces. The
widget "background" routine does the data display. In IDL 3.1 this is
more flexible since one can define update rates for such background
tasks.
For low data rate applications (<~10 points/second) the data collection
loop can be written in IDL. Higher data rate applications will require
that the individual data points be collected in the external compiled
routines or in hardware.
The adavantage of using IDL or PV-WAVE is the ease of programming and
debugging the hardware and the fact that the data being collected can be
analysed/displayed without invoking another program.
D
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For low data rate applications (<10 points/second)
--
Mark Rivers (516) 282-7708 or 5626
Building 815 rivers@bnlx26.nsls.bnl.gov (Internet)
Brookhaven National Laboratory rivers@bnl (Bitnet)
Upton, NY 11973 BNLX26::RIVERS (Physnet)
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