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Reply-To: "bruce varley"
From: "bruce varley"
Subject: Re: Echo sounder
Date: Tue, 21 Jan 2003 18:40:46 +0800
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Jens Rasmussen wrote in message
> Hi, I just recently bought myself a small (25ft) sail boat. Now, as
> I'd like to think I am a rather experienced electronics designer, I
> thought I'd design some useful gadgets for the boat. First out would
> be an echo sounder to measure depth (not for fishfinding). I have done
> some research, mainly on the net but so far I have only found out
> about how to do the wiring for off the shelf products. I was wondering
> if any of you reading and posting in this group has had any experience
> in designing an echo sounder. What I have managed to find out so far
> is this:
> Transducer/receiver of piezo material usually putting out 100W-1kW
> short bursts of 30-200kHz sinewaves. The same piezo element is then
> used to receive the reflected pulse burst and the depth is calculated
> by knowing the speed of sound in water (approx. 1500m/s). So far it
> sounds pretty simple but what I'd like to know are things like: What
> impact burst frequency has on performance? Do you really need 100W-1kW
> of burst energy? Do I need to shape the piezo transducer in some way
> (other than circular disc type) to keep the sound beam cone narrow to
> reduce unwanted reflections? How much attenuation do you get from the
> burst travelling in water and reflecting of rock or clay?
> What I was searching for on the net was som d.i.y. story from someone
> building one of these things, but so far I have not found a single
> echo sounder project that isn't using some off the shelf commercial
> product. Could it bee that the complexity of such a project is too big
> to be a d.i.y.?
> Any help on either a real project or some research data on echo
> sounding would be very much appreciated.
There was a home-constructable transducer design in Scientific American
Amateur Scientist section several years back.
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