Suggestions for a DIY hydrophone?


#1

Anyone have a link to instructions for a DIY hydrophone? This will be plugged directly into a laptop so no interface to OpenROV required.


#2

Here was a basic towed array from NOAA: https://swfsc.noaa.gov/publications/TM/SWFSC/NOAA-TM-NMFS-SWFSC-417.PDF


#3

DOSITS.org has a tutorial for a basic one. We’ve been kicking around hydrone ideas for a while. There was talk of trying to work with a few dolphin reserachers in Florida, but I haven’t had the cycles to follow up with it. Think we’ll get back to it over the summer though.

http://www.dosits.org/files/dosits/hydrophone_instruc_w_image.pdf


#4

Thanks @Kevin_K and @Jim_N. I’m looking for something dead simple and cheap to build. Something along the lines of whatJim_N posted. Unfortunately that design uses 35mm film case, which you just don’t see anyone more. I saw some Instructables using piezo’s and plexiglass, but wondered if anyone had any better ideas?


#5

Also check:


#6

Thanks @Jim_N that helps too! :smile:


#7

There is an old TAB book #1079 “How to build & use low-cost hydrophones” 1979 Frank Watlington ISBN 0-8306-1079-0. Originally it was $4.95. Amazon has a copy for $250. See if you can get one from a library or for under $10. It has lots of DIY info on building and using hydrophones, pre-amps, cables, housings, etc. mostly to listen to whales.


#8

Thanks @Douglas_Butler, I remember the old “TAB” books ( http://en.wikipedia.org/wiki/TAB_Books ), I used to have quite a few of their books at one time.


#9

Have you seen Dough Jacksons- SV seeker one https://www.youtube.com/watch?v=X4PPfkwrFiY


#10

A fairly simple approach for a piezo disk based hydrophone was done at Stanford Center for Computer Music (CCRMA) by a friend of mine - Sasha. I have one and it works pretty well.
https://ccrma.stanford.edu/~sleitman/Hydrophone/

Jim


#11

Jim I remember something about an acoustic modem from a year or so ago, sorry I’ve been out of it for a while, were you able to prototype it and test? It’s probably on the site haha my apologese if it is


#12

Lots of good suggestions, thanks everyone! I’ve ordered a hand full of piezo’s and once they get here I’ll go about making the housing.


#13

One more possibility for piezo-based hydrophones (http://www.coseetek.net/resources/index.cfm?FuseAction=ShowResourceDetails&ResourceID=670). We’ve gone through a few iterations to make a cost-effective (<$50), robust, and functional hydrophone for education outreach and hobbyists alike. This includes an instructional video, written instruction guide, and materials list. Good luck!


#14

Michael,

Very nice addition to the list of DIY hydrophones. The quality of the instructional video was quite good. Also a nice mechanical design from inexpensive parts.

A piece of data I would like to have is the frequency response curve of the piezo-disk based hydrophone. Do you know if COS-TEK folks have done any testing to show the frequency response in water?

Yesterday at OpenROV Scrap Yard Hackday Thomas and I experimented with a submerged speaker in our test tank and listened to music thru the water to a piezo-disk based hydrophone using the same Radio Shack mono-amp. We did a short Periscope video demoing this - I will try to post to youtube.

Jim


#15

Thank you, Jim. While we have had hopes to perform qualitative response curves of the hydrophone, it has only been qualitative to this point using Raven and/or Praat software. We have tested these both in the lab using submerged speakers and in the Long Island Sound with seemingly good success. I look forward to hearing more on your endeavors!
Regards,Mike


#16

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I have built a viable Hydrophone for the ROV using a Tascam DR-15. Complete instructions to come.