Re: Re: Measuring bath water depth

["Dave McLaughlin" <dave@xxxxxxx>]

Patrick,

ultrasound only works through a medium like water or steel and get
heavily
absorbed in air, ultrasonics, like in Polaroid Camera's will work
through
the air and reflect off the water. This is why they put that gooey stuff
on
mothers stomachs to get a good interface for the ultasound. Ultrasound
is
also used off shore to detect flooded member detection in platfrom
legs.
With no water in the pipe, you don't get a reflection from the far side,
but
with water in the pipe, you get a back wall reflection.

As a matter of interest on this idea, you could adapt the ultrasonic
radar
that Milford Instruments sell for this application. www.milinst.com and
look
under General Modules.

Regards
Dave...
----- Original Message -----
From: "PatrickLidstone" <patrickl@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, August 12, 2002 1:45 PM
Subject: [ukha_d] Re: Measuring bath water depth


> I was interested in ultrasound because it is non-intrusive. Probes
in
> the bath are unsightly, are difficult to secure mechanically, have
a
> poor SWMBO factor, and, perhaps most importantly, would, I think,
be
> unreliable - since most probes rely on the wet-dry factor,
resulting
> in false readings in any situation in which the probe starts off
from
> anything other than bone dry...
>
> Patrick

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