From: "Joseph Perkel" <joeperkel@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Hydrophone systems
Date: Thu, 10 May 2007 18:44:20 +0000
Peter and others,
When I was considering a war-boat replica, I had gone as far a acquiring
plans for a homemade directional hydrophone.
http://www.digitalmarketingusa.com/hydrophone.html
There are a number of commercial, albeit expensive units that are off the
shelf such as
http://www.sonotronics.com/html/products/receivers/mantrak.html
The idea being that one could mount such a device atop a short shaft
through a simple rotating thru hull. One could have a fixed compass rose on
the inside with the bow of course aligned
@ 360 deg, in order for the operator to determine and call out bearings.
When I was diving, I was fairly certain within.... I would guess a 90 deg
swath of the direction of props to try to keep myself from being
blended. This is with human ears so I am quite sure these units will get
that down to the degree.
If you really want to get fancy, there are software programs available that
will determine range based upon density and sound wave propagation. This
could be run on a Panasonic "Toughbook".
Joe
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