Re: [PSUBS-MAILIST] my optronic mast idea with sketch

["Jens Laland" <laland@artematrix.org>]

Jon

Thanks for your educational feedback (that I hope I understood correctly),
but it appears that I need to do a lot of experiments with these matters.

In one second I may think I understand the problem at hand, just to
realize within the very next second that the acknowledgment initially
reached during the previous second simply was the missing argument that
made me realize I did not understood much in the first place (does anyone
recognize the feeling?).

You wrote <quote>:

"For your condensation experiment, don't forget that cold air can't hold
nearly as much moisture as warm air."

<unquote>

Would this mean that my own breathing (producing damp air) would not be
held up by the air (in a cold environment), but rather condense itself
asap on the nearest surface that is colder than itself, is that it?

If this is correct, then the inside of a personal submarine operating in
Norwegian waters would be a rather cold experience combined with a
constant condensation problem. What have I got myself involved in here?

I know Vance has been operating in the immediate vicinity of my hometown,
so it would be interesting to know what he have to say about this.

You wrote <quote>:

"To duplicate diving conditions in a water vapor rich environment, you'll
want to have the CRT in a container filled with warm air (30+ C) with very
high humidity (90% or so), surrounded by a very cool (7-10C) outer
environment like a cold water tank.  The worst environment is one in which
the difference between current temp and dew point is very small."

<unquote>

There is a possibility that I might have misunderstood what you've just
said when I did built my CRT enclosure.

Therefore, let me explain my line of reasoning in this:

Air cannot produce more condensation than the total amount of humidity it
may have absorbed.

So I fill my enclosure with the best dry air that I can get.

An air tight enclosure would be an isolated atmosphere much easier to
control than the atmosphere present on the outside.

So I make the enclosure air tight.

And the temperature inside the enclosure would now be relatively easy to
control using a thermostat and local heating device plus the heat
generated by the circuitry itself.

Any sensitive electronic component that normally has its own cooling fan
would in worst case have to be modified and cooled using circulated water.

The only parameter left to be controlled to avoid any condensation inside
the enclosure, would be to move the actual temperature transition zone to
the outside of the enclosure.

This will be accomplished by insulating the outside of the enclosure and
let the aluminum housing itself be the prime target for the said internal
heating device(s).

In addition, the enclosure will have a pair of valves to simplify purging
with new dry air, when needed.

Best regards,
Jens Laland









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