Sonar & sound

payloads

#1

Friends,

Good Morning...

Just finished looking over the instructions...

The uses of ROV's is endless for education and research...

Two items for consideration...

# a Sonar gun on board the ROV for unlocking acoustic couplers...

# Audio beyond the use of sonar to communicate with whales..

I was introduced to the usage of acoustic couplers years ago out

at the Flower Gardens in the Gulf of Mexico. We had anchored

buoyant canisters at a depth of 35 feet measuring current velocity,

direction, etc. The canisters had to be serviced and we used the

above system to bring the canisters to the surface by releasing the

coupler with a sonar key...

The ROV with an onboard sonar emission system could be used to

unlock acoustic couplers in a hostile environment i.e. (sharks, etc.)...

Just one example...

Communicating with the whales, Need I say more...

Thanks for (Reading, Thinking, Acting)

Filed November 30th, 2013

.


#2

Very interesting. Any hints on a low cost transducer with a wide range, ~20-150kHz? I have started a projected looking at hydrophones and attachments to the OpenROV for similar applications.


#3

Jim N.

Good Morning...

The answer is NavSea...

Naval War College, Newport RI.

I believe it is the F30 which you would find useful...

It is used principally as a projector...

There are a whole array of products available...

Albert E.

P.S. Will forward the web address in a few..

www.navsea.navy.mil/nuwc/new.


#4

Hello Jim and Albert,

In my experience small silver coated ceramic elements are nice. My last company manufactures acoustic release devices which may be similar to the acoustic couplers you are referring to? http://www.desertstar.com/Products_category.aspx?intProductCategoryID=8

The ceramic elements aren't going to give you the frequency range you want from what I understand. They get good range though.

Piezo film, in contrast to the heavier ceramic elements, is good for receiving but not really for transmitting. http://www.meas-spec.com/piezo-film-sensors/piezo-film-elements.aspx So if you just wanted the ROV to listen to clicks coming from several acoustic base stations and figure out it's own position in a passive mode that light weight piezo elements could work.

-Matthew