Hydrophone or underwater microphone

Hydrophone or underwater microphone – underground acoustic monitoring and recording equipment.

Welcome to our website that covers an introduction to hydrophones, sonar, underwater and subterraneal acoustics. In these pages you can learn about their uses, the ability of ultrasonic sound recordings (normally using a piezoelectric transducer), ultrasonic sensors, example arrays and information on making the right hydrophone selection. There is also a guide and instructions on how to build your own project, an interactive blog and additional educational science projects.

Since the development of the hydrophone in the early 20th century, more and more developments are being discovered and tested. There has been an increase in the adaptability of the hydrophone principal in recent times. These range from sports implementations, secret military developments, television sound recording, natural science applications, etc.

Although hydrophones are now considered obsolete by today’s standards, it is from this foundation that other more effective transducers are developing. There are now fibre-optic broadband, kevlar hybrid and microelectronic preamplifier versions capable of being over 9000 meters in length. This advance in technology leaves the standard hydrophone mainly used for listening to sounds of underwater life and natural occurring phenomena such as earthquakes, underwater volcanic eruptions, and waves. Hydrophones can also be used on board ships or yachts for navigation purposes, underwater mapping, and communication alongside sonar implemented equipment.

On the down side, hydrophones can only listen to pressure differences and sounds. They are also limited in their ability to distinguish between natural phenomenon and artificial noises, and likewise between singular and multiple objects. Some hydrophones may be connected to radio transmitters, but otherwise they cannot detect, record, or transmit in real-time.


Therefore, this means that the hydrophone has limits in today’s expected standards, although in reality they are invaluable in their own right.

Explore our hydrophone guide pages in the menu to find out more about this fascinating world of unheard sounds. We hope you will find this website useful and informative, and welcome your comments.

We also encourage any uploads of your own recordings you might wish to share with the community for all to enjoy and appreciate.

This can be done either on this website or over at our Facebook page here:- https://www.facebook.com/Hydrophone-guide-1027374060653130/