RE: [PSUBS-MAILIST] Acrylic View Ports vs. long-wave UV-Light

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

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/directional_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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