Hydrophones are a type of microphone that realize on piezoelectric transducers, which is a devise that produces a electric current when a mechanical force is applied to it, to detect sound a other pressure waves underwater. This is because piezoelectric materials can change shape , and convert mechanical energy into electrical energy, because sound is a form of a pressure wave underwater. Now there are ups and downs to a hydrophone one big plus is that in conventional hydrophones they don't need a power source whereas many other underwater instruments must have a source of power. A down side to a hydrophone is it only detects sound and pressure waves and a hydrophone can't distinguish between multiple objects. Early uses of the hydrophone date back to World War I where they were used to listen for German U-boats and are still used today for underwater seismology, aquatic research, and deep sea sound. You can also use them in the air and in the ground however they work best in the water.
http://www.tech-faq.com/hydrophone.html
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| The Hydrophone I have built with a power source. |
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| One that's way more fancy and doesn't require a power source. |
Angela Boney:
Thank you for answering my question. Sounds like the poor shark or whale is carrying a 24/7 boom box that makes annoying beeps.To hear the toothed whale, are you able to do that from somewhere on the coast or would you have to go out on a boat?
I may actually be able to record sound from the Intercostal water way; However, either way I think I am going to need a boat. Also I water to bring along the Hydrophone that Doctor Woodall has to compare them.
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