Re: measuring depth

["Glenn R. Bartel" <mwengineering@yahoo.com>]

Hi Jolyon:  We have used a standard divers depth gauge mounted to one
of the ROV skids and a compass on the other.  When mounted within view
of video camera it gave us a constant readout of depth and orientation
of the ROV on our monitor and tape.  Not very exotic but cheap and
easy to do!

Glenn Bartel




---Jonathan Shawl <shawl@torchlake.com> wrote:
>
> 
> 
> Jolyonp@aol.com wrote:
> 
> > Hello everybody,
> > I certainly have enjoyed all the great e-mail on this site. 
However, I have a
> > question that I hope some of you can help with.  I've been
building unmanned
> > submersibles for a few years...each one is a bit better than the
last.  I
> > operate them from a boat on the surface...I hope to make one good
enough to
> > investigate sunken ships at some point.  My question is this:  I
need a device
> > that measures the depth that my sub is operating at and then
transmits the
> > information to a display on the surface.  This isn't a remote
controled
> > boat...it is "hard wired".
> > Any ideas?
> > Thanks very much,
> > Jolyon Pegis
> 
> Hi, Jolyon
> I can think of 2 ways to do that easly.
> 1- Put a electronic pressure transducer on the ROV and use wire to
send the signal
> to the surface.
> This can get expensive depending on how acurate you need it, and how
long a wire
> you are running.
> or
> 2- Run a small cheep clear plastic or rubber tube down along with
your power
> wires, attach one end to the Rov. The other end you connect to a air
or nitrogen
> gas source that has a flow regulator, (you will need a pressure
regulator ahead of
> flow regulator if using HP gasses) Set it so that the air is flowing
a very small
> amount out the tube throughout the dive, just enough to keep the
tube full of
> water when diving down. Then with a accurate dial type or electronic
pressure
> guage, T it into the line,  you get a pressure reading equal to the
water pressure
> at the ROV.  Then calabrate the guage system for feet of water, or
just calculate
> the depth from PSI. You can get pressure guages that are calabrated
to feet of
> water. Remember to recalabrate if you switch from fresh to salt
water or back.
> Jon Shawl
> 
> 

==

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