piclist 2002\01\17\042151a >
Thread: photodetectors ( tag changed from OT)
www.piclist.com/techref/index.htm?key=photodetectors+tag
picon face BY : Russell McMahon email (remove spam text)



> >Last time I 'heard' anything they were
> >trying to use ultrasonic not-quite-so standing waves
> >to pump the helium around.
>
> Hmm, my current project is to simulate a J-T cooler which uses piston
pumps,
> so they can develop software for a DSP in the drive electronics without
> having to run an expensive-to-run cooler and risk damaging it. ;)
>
> Did hear something about an ultrasonic method of pumping as well, but it
was
> going to be another project.


I would be interested in hearing about the JT cooler - perhaps under a
different [EE] topic tag to avoid confusing this thread. What sort of size,
what piston pumps are being used? JT is usually a largish scale industrial
process and requires rather high pressures to be useful (2000 psi+ typical)
so I would be interested in hearing if this is small or lower pressure.
Gifford-McMahon (no relation :-) ) (poor man's Stirling) lends itself more
to smaller systems.


       Russell McMahon

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