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Jens, This system is based upon a "bender" hydrophone. This is simply a piezo element that is secured to a flat surface and isolated from the water to prevent short circuits. It produced minute electrical signals when exited by sound waves traveling in the water. These small electrical signals (AC) are the amplified by electronic means up to a level we can hear and interpret. In short, it listens to and amplifies raw acoustic sound. This collision avoidance sonar is basically the listen or receive half of an underwater broadband communications console. It contains only one amplification channel and although it can transmit provided a broadband voice transmitter (an underwater speaker) is available, this would require changing the input and output devices attached to the unit. We are in the process of determining how well this hydrophone and device will be able to pick up on the noises produced by boat traffic as these move thru the water. By detecting this boat traffic and surfacing or maneuvering according to this information we hope to provide the submarine operator a tool that when used properly should aid in the avoidance of collisions with surface craft or other submarines. Another use for this simple tool is to allow for the listening to and enjoyment of the many noises made from aquatic wildlife. I hope this has answered your questions. Ask more should you have any. David Bartsch > Date: Tue, 25 Aug 2009 14:54:01 +0200 > Subject: Re: [PSUBS-MAILIST] initial test results > From: laland@artematrix.org > To: personal_submersibles@psubs.org > > David > > It is always very interesting to hear about your projects, especially > since I try to learn something about the sonar technology myself. > > When I read your current report from the testing ... > > ** It was functioning as expected and the shock mounting used to secure > ** the hydrophone worked so well at isolating this sensor that the motors > ** aboard the submarine could not be detected. > ** Regretably, no other crafts were in the lake at the time of testing as > ** it was very cold and windy. > > ... I am still a bit confused about what kind of signals the system really > was able to pick up. > > Is it possible you could tell me some more? > > Best regards, > Jens Laland > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Windows Live: Keep your friends up to date with what you do online. Find out more. |