http://www.teledyne-reson.com/product-category/hydrophones/

@Souhali: I guess hydrophones are not the suitable devices to produce ultrasonic signals.      ;-)

@Agha: Perhaps a direct contact to our transducer development group might help. See link below:

http://tinyurl.com/pa4w4zk

Regards,

Marc

I use this:

http://lubell.com/LL916_Basic_System.html

and it works quite fine above 200Hz. You must notice that 10dB its not a pressure number, you must think in dB re 1 uPa for underwater measurements. The maximum pressure this device can provide is 180 dB re 1 u Pa@1m

All the best,

David

Thank you David, u made my life easy.

Plz guide me further that can i manipulate the amplitude of signals inside water with this device and if i produce sine waves of 200 Hz and play inside water through this device, ideally how much distance it could cover without changing frequency and amplitude.

We need at least 10 meter distance

Hi Agha, 

our device comes with a small radio amplifier where you can connect your signal ( provided by a signal generator or a computer for example) trough a TRS (Jack) connector.

The distance depends on the propagation losses scenario (deep ocean, shallow water, swiming pool, type of floor, etc) but for sure you won't have problem for 10m of distance. I think you can easily reach to 500m with a decent pressure level.

All the best!

David

 I am living in Malaysia, do u have any supplier here. What will be the maximum cost ? I need your personal email address. 

Hi Agha,

I don't sell these devices, I just use them :)

You have to contact with the people at Lubell http://lubell.com

All the best!

David

Hi David,

Thanks for your feedback,

I have attached a file in which rough simulation has been designed graphically please see and guide, either in this way can i produce the required signals inside water. 

Further, how to connect the laptop with amplifier i mean is there any specific cable or with normal cable we can because i will play signals from my laptop and then will be amplified

I will keep in touch with you

Regards

Agha

Hi Agha,

I think your scheme is correct and you won't need any special cable for connecting your laptop to the amplifier, a simple mini TRS to TRS should work, anyway you can ask the Lubell people for these kind of questions.

All the best!

David

Thank you David