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Jon, The problem I have encountered in developing a single rotatable hydrophone, is that now that the barrier for sound reception is only microns thick, these hydrophones are very sensitive almost to the point that any vibration no matter how minute is easily heard. (Even small ball bearings or brass shaft fittings tend to be very distracting and loud.) It is only when such a trainable system is moved and then allowed to be stationary allowing the electronics to stabilize that I feel this single hydrophone concept could be very effective. The captain developed a trainable sonar hydrophone seen in shots of his K-600. What things did he discover were the pros and cons of this set up? Perhaps He can give us some insight into this idea. David Bartsch > Date: Sun, 12 Jul 2009 16:34:27 -0400 > From: jonw@psubs.org > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] passive hydrophone array pictures! > > > David, > > Thanks for posting the photos. I recall you saying something about the > plastic cups as far as directionality, but I don't recall exactly what > it was. Assuming the plastic cups are not effective at producing > directionality, what do you hope to come up with in terms of testing > data? Assuming you found a material that did effectively provide > directionality, would it be more advantageous to have one element that > could be rotated, rather than 18 elements that are switched > mechanically? Also, since part of the reason for having one of these is > for surface collision avoidance, it would seem that a 20 degree cone > would be a bit narrow when surfacing and a unit pointing upwards will be > required. > > Jon > > > > David Bartsch wrote: > > To all: > > > > I have posted five 18 hydrophone passive sonar array pictures for > > you to view. > > > > These have been placed under "resources and references" then under > > "projects and photos" then select "David Bartsch" and finally "passive > > sonar". > > > > It is a work in progress and I have much work to do prior to its > > completion. > > > > Enjoy them and please share with us your thoughts and ideas. (keep > > this open forum to assist in generating further discussions and > > comments please) > > > > > > David Bartsch > > > > ------------------------------------------------------------------------ > > Windows Live™: Keep your life in sync. Check it out. > > <http://windowslive.com/explore?ocid=TXT_TAGLM_WL_BR_life_in_synch_062009> > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > 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™ SkyDrive™: Get 25 GB of free online storage. Get it on your BlackBerry or iPhone. |