You need a film thickness monitoring
system and tantalum boats I did put up a drawing of my design in
the photos or files sections, most use quartz wafers and crystal
oscillators to monitor the film thickness. I have a monitor unit
and oscillator (built by Ken Hunter) the monitor is a mid 70's
unit. Happy to ship if we can figure a reasonable way to do it.
I'm offering this at cost (I'll send that off list) as I'm having
to move and I start Med-school in a little over a month's time.
Oh the boats draw a higher amperage than the Al evaporators.
Cheers, Thomas.
On 9/12/2013 5:39 AM, Guy Brandenburg wrote:
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?
Someone proposed that I investigate how much it
would cost, both time and energy, to add on the
capacity to do overcoating (i.e silicon monoxide or
dioxide or MgFl or whatever) to a late-1960s
Electrodynamics corp vacuum chamber with bell jar that
right now just does bare aluminum.
I know my predecessors tried and failed;
they were a lot better at electronics than me. I've
looked it up in the past in various printed and online
sources dating back to the 1950s and I'll admit I'm
intimidated. I don't recall any details though.
Sounded like the hardest part is determining when you
have the right thickness, and you have to use all
kinds of weird and strange tricks do determine that
thickness indirectly...
Anybody done this? How hard is it? What
extra devices did you find that you needed?
Thanks so much for your help in the past.
(Our chamber has been doing pretty well for a while
now.)
?
Guy Brandenburg, Washington, DC?
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