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RE: [PSUBS-MAILIST] Rudder angle indicators
Has anyone suggested/thought of a setup similar to what is inside a
computers mouse?? A metal disc with slots cut in it around the outside,
and a photo transistor and photo diode above and below the disc so the
slots break the beam of visible or IR light?? Ofcourse it would be much
larger than the mouse's encoder etc.. The disc attached to the rudder
shaft and protected by an unpressurized plastic housing...
The photo diode and transistor would have to be potted in some kind of
housings, maybe a stainless steel tube with a Perspex window at one end,
with the photo diode and transistor right at the end with the Perspex
and the rest of the tube filled with opaque/as clear as you can get
epoxy... and no air bubbles :)
And there would be some additional circuitry inside the sub to count the
pulses generated by the transistor as the disc moves around... from that
you could use an DAC to convert the digital output to an analogue signal
or output it on an LCD/LED display if you want to keep it digital...
Ill do a quick drawing if this sparks anyones intrest :)
Stew
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jens Laland
Sent: Tuesday, 16 March 2010 2:08 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Rudder angle indicators
Jon
** what is the solution to waterproofing the potentiometer?
You better ask Alan about the underwater use of potentiometers, and how
to
waterproof them. Personally, I hope to find a way around it by using an
inductive device, that I hope will lend itself perfectly to epoxy
potting.
Best regards,
Jens Laland
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