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Hi David,
I am located in Wisconsin and would be happy to help if I
can. I must tell you that I have minimal electronic experience.
Best Regards,
Jim K
----- Original Message -----
Sent: Tuesday, August 05, 2008 3:30
AM
Subject: RE: [PSUBS-MAILIST]
Convention
Jim,
The military used hydrophones formed
in a circle. Since sound propogates from a single point of origin, it expands
from this point in an ever enlarging circle. These sound waves would
eventually encounter this hydrophone array and strike specific hydrophones in
a set given order as it continues to pass thru this array. The military having
almost endless resources had the ability to determine the bearing to the point
of this sounds origin by this sequence of detections and hence where it came
from.
Dealing with Psubs, we have limited space, limited funds, and
the need for exact contact bearing of detection is not critical.
I
too am at a loss as to the lack of bearing accuracy now being shown from these
later units. The initial "dolphin ear" hydrophone had almost no side detection
capability and the level of detection increased as the source became closer to
ninty degrees from the piezo elements mounting surface. It was bi-dirrection
as back side detections were also part of its beam pattern.
I need
to go back and redesign this unit so as to regain its dirrectionality (Is
there such a word?)
Where is your location, and do you feel like
participating in this road of discovery? Your input, testing, and evaluations
would be a great asset to us all.
Do you have a working sub or one
under construction? Are there lakes, ponds, or other bodies of water nearby
for
testing?
David Bartsch
From: kocpnt@tds.net
To: personal_submersibles@psubs.org
Subject:
Re: [PSUBS-MAILIST] Convention
Date: Mon, 4 Aug 2008 21:02:13
-0500
Hi David,
I think that the underwater hydrophone testing went
well. The results were not as good as hoped for from a directional standpoint.
I brought up that if we used some of the same components and made the tube
from steel or some othe dense material, I think that directionality will be
improved. This is just a guess. Perhaps the opposite is also true, you could
use the similar tube and some insulation to soften the reaction of the outside
diameter of the tube and allow the acrylic front take a higher percentage of
the feedback. I feel as if one or the other of these approaches are worth
testing for positive directional results.
Best Regards,
Jim K
----- Original Message -----
Sent: Monday, August 04, 2008 5:45
PM
Subject: RE: [PSUBS-MAILIST]
Convention
Jim,
It is my understanding that the
weather played against us when it came to the underwater passive hydrophone
and pinger presentations. Of what you were able to participate in, what are
your thoughts and reactions on this
presentation?
David Bartsch
From: kocpnt@tds.net
To:
personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST]
Convention
Date: Mon, 4 Aug 2008 05:29:08 -0500
Hi All,
Having just returned from the comvention, I
would like to thank Jon & Ray for all the effort to put together a fine
meeting. I learned a lot and met some more great people. Also thanks to all
presenters, who added to my personal knowlwdge base.
Thanks again,
Jim K
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