8 degree transducers

[Jan]

Hi,


I did some basic calculations on the 8 degree sensors


I am afraid they are of no use since the area that they lite up is way to small.


What will happen is a large area will whiteout and just a small area will be lit.


Even 40 degree lenses, although much better, are not perpect for the job.


This evening I will recheck my program to see if I made any mistakes, but I am afraid I made no mistakes.


So, we have to think about a 40 degree transducer with a kind of sonic lens.


Perhaps we could look for universities all around the world to ask if they have ideas about sonic lenses.


We want a transducer that emits/receives 200-900 kHz sound waves (in burtsts of about 10-20 pulses) with a 0.1-0.5 degree fanout in horizontal plane and a 40-50 degree fanout in vertical plane.


This would be ideal.... will also settle for bit less.


Anyone with some ideas about this, please let me know.


Regards, Jan

[Patrick Duffy]

Jan,


I'm just hoping that Sture will be willing to share his expertise (and hopefully plans) on his transducers. If so, it would save all of us a lot of time.


I sent him an e-mail requesting this and asking him to join the list.


I also asked Dan Fountain to join.


Patrick

[Jan]

Patrick,


Got an email from Sture.


He asked me to remind him to have a look in this forum when he is back in august.


So you might not get an aswer until then.


I think he used secondhand sidescan transducers.


Well... might start chatting up the Russians.. you never know, they might rip some transducers out of their submarines for some hard dollars... hehe


regards Jan


B.T.W. An acoustic lens does exist.


There is even a program to design them.


I am trying to understand it... bit difficult


though ....

[Patrick]

I was under the impression that Sture had made a transducer because one of the two on his fish was not functioning.


I would think that the Russians have a decent sidescan or transducers at a reasonable price. Anyone have any contacts over there? I believe that Dan Fountain was in contact with a Russian Professor on his magnetometer project.


Also, the price of the C-Scan 450 is $12,500 US. It includes a complete side scan sonar system, with tow fish, processor, cable, winch...ect. ready for use.


Patrick

[Jan]

Funny that you should mention that,


Was wondering what this sidescan hould cost.


Have also a look at http://www.questelectronics.com/


They talk about $7000.-


But about the Russians... it was meant as joke but one might try it.


Who knows, perhaps there are some Russian readers on this Forum.


regards Jan

[Patrick]

Last night I came across a site that mentioned a Russian unit but was unable to open the site. I'll try again tonight.


That $7000 Quest unit was originally (around a year ago) priced at $5000. Looks like it went up.


I would imagine that IF you could get a Russian unit (I'm sure they have them) it would be cheaper.


Patrick

[Jan]

Well, its worth a try.


I will start looking also.


If I find something I will let you know.


Regards, Jan

[Tod Patterson (CT)]

The manufacture I spoke with said they supply the rectangle piezo elements for a fish and it used 2 hundred elements @ $4 a peace . The size was 1.4x.13x.1"


Regards,


Tod