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RE: [PSUBS-MAILIST] Acrylic View Ports vs. long-wave UV-Light
Jen,
As always you illustrate your points very well. I had forgotten about UV
LEDs...don't know how these will effect plastic gage faces over time.
Think you are worrying too much about a non-issue. Any causality that
extends for any length of time will not need most of your instrumentation.
Oxygen tank pressure, cabin pressure, and oxygen level meter are the only
things that I can think of that would be important. You should have already
known your depth and heading. Adding an additional electrical system for
something that could be handled by a pen flashlight (that should be carried
anyway) would be just added complexity that is another system to be
maintained.
GREAT IMAGES!
R/Jay
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jens Laland
Sent: Sunday, December 13, 2009 4:11 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Acrylic View Ports vs. long-wave UV-Light
Jon & Jay
I agree with you both that in a simpler world the question of not using
ultraviolet (black) light could have been avoided altogether.
However, for me the two questions (or at least question #2) continues to be
a valid problem that is not that easily ignored or just solved using a few
red light emitting diodes here and there.
Let me show you a good example, ref
ftp://ftp.artematrix.org/personal_submarine/instruments/directional_gyro/dir
ectional_gyro_in_UV-light.jpg
The above image shows a working WW2 directional gyro indicator that I can
only observe properly in the dark by using ultraviolet light.
A single 5mm UV-LED using some 30-40mA/12 VDC would easily do the task
(mounted inside an eyebrow lamp placed across the top rim of the display
itself), ref
ftp://ftp.artematrix.org/personal_submarine/instruments/UV-Lamps/Instrument_
Panel_Lamp_1.jpg
The vast majority of instruments could easily be operated without any use of
ultraviolet light, but not without losing some niceties, of which I will
return to later.
I know from personal experience that most instruments could be modified to
work with one or two red colored LED's. And with instruments that you make
yourself its even more easy to do so, ref. these preliminary views of my
next depth gauge to be)
ftp://ftp.artematrix.org/personal_submarine/instruments/depth-gauge/redlight
%20version/angle-eye_600w.jpg
ftp://ftp.artematrix.org/personal_submarine/instruments/depth-gauge/redlight
%20version/pre-test_scale_600w.jpg
Finally, imagine the above illuminated depth gauge also had an extra pair of
UV-LEDs that would only be activated in case of total power loss onboard.
Run from a local dry battery, the illumination of the depth gauge (and other
vital instruments) would then be maintained. But for how long?
One thing I am trying to prove is that such emergency illumination of vital
instruments could be made to last a whole lot longer than just the said
amount of ampere-hours on a battery, if electronically controlled
intermittent use were to be implemented.
And since such a control circuitry would have to be supplied by the same
battery - it would have to be designed having an extremely low power
requirement.
Best regards,
Jens Laland
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