Joe,
An array is needed, for my home-built side-scan sonar, 4
transducers in a series-parallel combination formed a sufficiently narrow beam
for scanning. Would guess a similar hydrophone array would produce
satisfactory results. One thing to keep in mind depending on what type of
hydrophone is employed; there will be 2 opposing lobes off of the phone…determining
which lobe is hearing the noise source can be an issue. If the hydrophone
is pointed forward and the strongest signal is received in this position, the
source could be dead ahead or dead astern.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
A skimmer afloat is but a submarine, so poorly built it will not
plunge.
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph
Perkel
Sent: Friday, May 11, 2007 7:58 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Hydrophone systems
David,
Free is always the "right price"! I cannot be there but, look
forward to seeing the results.
Let me ask you this,... what can a homebuilder expect in terms of narrowing
the bearings to prop sounds to say... within 5 deg? Is that a reasonable
expectation?
Joe
From: "David
Bartsch" <dbartsch2236@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Hydrophone systems
Date: Thu, 10 May 2007 23:32:25 -0400
>Joseph Perkel,
> Nice hydrophones...my plans are free and will be available at
the
>upcomming convention!
>
>
>>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
>>
>>
>>
>>
>>************************************************************************
>>************************************************************************
>>************************************************************************
>>The personal submersibles mailing list complies with the US Federal
>>CAN-SPAM Act of 2003. Your email address appears in our
database
>>because either you, or someone you know, requested you receive
>>messages
>>from our organization.
>>
>>If you want to be removed from this mailing list simply click on
>>the
>>link below or send a blank email message to:
>> removeme-personal_submersibles@psubs.org
>>
>>Removal of your email address from this mailing list occurs by an
>>automated process and should be complete within five minutes of
>>our server receiving your request.
>>
>>PSUBS.ORG
>>PO Box 53
>>Weare, NH 03281
>>603-529-1100
>>************************************************************************
>>************************************************************************
>>************************************************************************
>>
>
>_________________________________________________________________
>More photos, more messages, more storage—get 2GB with Windows Live
>Hotmail.
>http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_2G_0507
>
>
>
>
>************************************************************************
>************************************************************************
>************************************************************************
>The personal submersibles mailing list complies with the US Federal
>CAN-SPAM Act of 2003. Your email address appears in our database
>because either you, or someone you know, requested you receive
>messages
>from our organization.
>
>If you want to be removed from this mailing list simply click on the
>link below or send a blank email message to:
> removeme-personal_submersibles@psubs.org
>
>Removal of your email address from this mailing list occurs by an
>automated process and should be complete within five minutes of
>our server receiving your request.
>
>PSUBS.ORG
>PO Box 53
>Weare, NH 03281
>603-529-1100
>************************************************************************
>************************************************************************
>************************************************************************
>
************************************************************************
************************************************************************
************************************************************************ The
personal submersibles mailing list complies with the US Federal CAN-SPAM Act of
2003. Your email address appears in our database because either you, or someone
you know, requested you receive messages from our organization. If you want to
be removed from this mailing list simply click on the link below or send a
blank email message to: removeme-personal_submersibles@psubs.org Removal of
your email address from this mailing list occurs by an automated process and
should be complete within five minutes of our server receiving your request.
PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100
************************************************************************
************************************************************************
************************************************************************
|