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Jens, Wow! I am speechless. Well, we know who to turn to for sonar related questions! It would be my goal to come up with something along the lines of WWII abilities. David Bartsch > Date: Fri, 13 Nov 2009 03:25:16 +0100 > Subject: RE: [PSUBS-MAILIST] guide to hydrophone construction > From: laland@artematrix.org > To: personal_submersibles@psubs.org > > Was it this book you were referring to, David? > > "Submarine Sonar Operator's Manual" > Navpers 16167, The Submarine School > http://www.maritime.org/fleetsub/sonar/index.htm > > Just in case you have not looked into the next one, then please do: > > "Naval Sonar, NAVPERS 10884", > > Although, this one is not really part of the "fleetsub" series since it > was created a few years after WW II (1953); but it incorporates the major > innovations of WW II. It actually describes the peak of WW II US sonar > technology with a hint of the coming Cold War technology. > http://www.hnsa.org/doc/sonar/index.htm > > And to answer the mysterious "abyssalobsession", here is a book written by > an austrian engineer who worked as a consultant for the Austrian > Kriegsmarine... > > Unterwasserschalltechnik, Grundlagen, Ziele und Grenzen > (Submarine Akustik in Theorie und Praxis) > by Franz Aigner > M. Krayn, Technischer Verlag, Berlin 1922 (322 pages) > > The part in this book that I have studied so far has to do with "binaural > listening", a 'technique' that I would like to see being combined with > David's hydrophones. At the time these early, carbon microphone based > systems could fix bearings that came within a 5-7 degree accuracy. > > This is all WWI technology, but I don't think it should be left untried. > Such a system uses 2 hydrophones, one one the port side and the other to > starboard. > > Here are two images from the book, showing the mechanical, acoustic beam > former (compensator). > > ftp://ftp.artematrix.org/sonar/binaural-listening/binaurale-hochanlage.jpg > ftp://ftp.artematrix.org/sonar/binaural-listening/stereoskopisch.jpg > > A slightly improved system (used by the allied as well) had an extra > hydrophone oriented forward (forming a equal sided triangle). > > But hey, you can read some more about this in the following book: > > "Seek & Strike, Sonar, Anti-Submarine Warfare and the Royal Navy 1914-1954" > by Willem D. Hackmann, > Her Majesty's Stationary Office, London 1984 (487 pages) > > Actually, from this book I've made some preliminary sketches on how to > build a working replica of the binaural-compensator built for the US Navy > during the early days of underwater listening. See this image: > > ftp://ftp.artematrix.org/sonar/binaural-listening/binaural-compensator_USNavy.jpg > > You could also read a transcription I did during my research (covering > binaural listening) from J.W. Horton's great book from 1959, called > "Fundamentals of Sonar" here: > > ftp://ftp.artematrix.org/sonar/binaural-listening/binaural-listening_Horton.txt > > See also these scanned images that is from the same chapter as the > transcription: > > ftp://ftp.artematrix.org/sonar/binaural-listening/Fig_7B-1.jpg > ftp://ftp.artematrix.org/sonar/binaural-listening/Fig_7B-2.jpg > ftp://ftp.artematrix.org/sonar/binaural-listening/Fig_7B-3.jpg > > By the way, two copies of Horton's book is available for sale on amazon, > right now, see > > http://www.amazon.com/gp/offer-listing/B000ZFRA0I/ref=sr_1_olp_1?ie=UTF8&s=books&qid=1258078095&sr=1-1 > > Just a few more recommendations, and then I'm through. > > The next two books are among my absolute favorite one. Both are excellent > reference books covering a lot of knowledge related to acoustics (and even > underwater sound and hydrophones). A real must (do I sound like a book > seller?). > > #1: > > "A Textbook of Sound" by Albert Beaumont Wood (3. edition) > G. Bell and Sons Ltd., London 1960 (610 pages) > > -- 'Being an account of the Physics of Vibrations with special reference > to recent theoretical and technical developments. > Dr. Wood (1890-1964) was a British physicist, known for his pioneering > work in the field of underwater acoustics and sonar'. -- > > #2: > > "Fundamentals of Acoustics" by Lawrence E. Kinsler & Austin R. Frey (2. > edition) > John Wiley & Sons, Inc. 1962 (524 pages) > > -- 'Presenting the fundamental principles underlying the generation, > transmission, and reception of acoustic waves'. -- > > If there should be a #3 it must be this one: > > "Ultrasonics" by Carlin, Benson (2. edition) > McGraw-Hill Book Company, Inc. 1960 (309 pages) > > Yes, this last one is primarily written for the NDT people, but it > contains a lot of educational material (easy to understand) on every > important engineering phase - from the design consideration of ultrasonic > crystals to the experimental measurement of ultrasonic waves (including > data on instruments and applications). > > Finally, here is two real in-depth transducer and hydrophone design books > that I recently bought. Mind you, though: I'm still in that optimistic > pre-phase where I just browse anxiously through them from time to time. > > I definitely need to catch up a lot more on general physics and math > before I really know how to use and apply all the ( promising? :)theory > covered within both texts. > > Although, the first is not really that bad... > > #1: > "Introduction to Theory and Design of Sonar Transducers" > by Oscar Bryan Wilson, > Peninsula Publishing 1988 (191 pages) > > -- 'The author walks through a 5-kHz transducer design, starting with both > electrical and mechanical requirements, and describes the trade-off > analysis. He finishes by detailing one practical design that meets the > objectives and outlines procedures for design adjustments'. -- > > #2: > "Transducers and Arrays for Underwater Sound" > by Charles H. Sherman & John L. Butler, > Springer 2007 (612 pages) > > -- 'It presents the basic acoustic concepts and models needed in > transducer and transducer array development, and discusses most currently > used transducer designs. It analyzes nonlinear effects and describes > methods of transducer evaluation and measurement. > A complete set of exercises and solutions from the book are currently > available on the Springer website'. -- > > I hope someone will find my recommendations useful, otherwise - well, > maybe it could be a thing for the records. > > Speaking about the records, Jon. Here is something I once downloaded, but > forgot all about when we were discussing submarine communication, > emergency pingers, and what not. > > It's a study, supported by the U.S. Coast Guard : > > "Present and Future Civil Uses of Underwater Sound" > by the Committee on Underwater Telecommunication, > National Research Council, > National Academy of Sciences, Washington, D.C. 1970 (131 pages) > > Best regards, > Jens Laland > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. 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