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Re: Kayaking with Hydrophones

Subject: Re: Kayaking with Hydrophones
From: "charlieo12345" <>
Date: Wed, 24 Mar 2004 03:01:22 -0000
Thanks guys, that has helped me a lot.

I think I will use a buoy to separate one mic from the boat and then drop t=
he other
one over the side, getting a variety of separation and see what works best.=
 Or trail a
buoy behind me with the mics seperated on the line.

Charlie

--- In  Walter Knapp <> wrote:
> From: Wild Sanctuary <>
> >
> > Sound travels about 5 x faster in water (approx. 1100ft/sec in air
> > and 5000 ft/sec in water, depending on salinity and temperature),
> > Charlie, and has very different transmission properties because of
> > the density of the medium. Given our experience, my guess is that a
> > three foot spread ain't gonna work very well. You'll need more.
>
> Head spaced stereo setups, which is what we are talking about, have a
> barrier to represent the meat in our head, without that they don't get
> much stereo either. To duplicate that in hydrophones it would be
> necessary to provide a barrier. I expect if a equivalent acoustic
> barrier could be designed that they would work at the closer distance.
> Not sure about the appropriate material, many barriers in air are not
> barriers in water.
>
> Otherwise you are duplicating spaced omni's with no barrier and the 10
> meters sounds in the ballpark for duplicating those.
>
> Walt
> 



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