RE: Re: Measuring bath water depth

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

Out of interest, will bubbles stuff the reflections and cause problems?

Also, would "Mark's gut" similarly work?

M.

-----Original Message-----
From: PatrickLidstone [mailto:patrickl@xxxxxxx]
Sent: 12 August 2002 13:45
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: Measuring bath water depth


--- In ukha_d@y..., Stuart Grimshaw <stuart@s...> wrote:
> On Monday 12 Aug 2002 1:20 pm, Stuart Poulton wrote:
> > Patrick,
> >
> > I like the idea of this,  be interesting to see if anyone is
able 
to try
> > this.
> >
> > There are of course ustrasound sensors used in robotics
available.
> 
> What about using a capacitence probe? Two strips of metal, the more
water in 
> the tub, the greate/lesser the capacitence. Have a look at 
epanorama.net for 
> more info.

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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