A new study demonstrates for the first time that the same undersea fiber optic cables used for internet and cable television can be repurposed to tune in to marine life at unprecedented scales, potentially transforming critical ...
Plants & Animals
Jul 19, 2022
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1099
(Phys.org) -- A team of scientists that last year created waves by correctly forecasting the 2011 eruption of Axial Seamount years in advance now says that the undersea volcano located some 250 miles off the Oregon coast ...
Earth Sciences
Jun 10, 2012
8
0
Cows moo. Wolves howl. Birds tweet. And fish, it turns out, make all sorts of ruckus.
Plants & Animals
Mar 2, 2022
0
132
At a time when ocean noise is receiving increased global attention, researchers at Oregon State University and NOAA have developed an effective method to use an underwater robotic glider to measure sound levels over broad ...
Earth Sciences
Nov 20, 2019
0
135
(Phys.org) —There is growing concern about how much noise humans generate in marine environments through shipping, oil exploration and other developments, but a new study has found that naturally occurring phenomena could ...
Earth Sciences
Jul 11, 2013
6
0
(Phys.org) -- When a University of Washington researcher listened to the audio picked up by a recording device that spent a year in the icy waters off the east coast of Greenland, she was stunned at what she heard: whales ...
Plants & Animals
Jul 31, 2012
0
0
(PhysOrg.com) -- Researchers attempting to map the various types of fish living in the eastern Gulf of Mexico have been using an automated sea glider, which is a small autonomous submarine outfitted with a hydrophone. The ...
Using a system of underwater hydrophones that can record sounds from hundreds of miles away, a team of scientists from Oregon State University and the National Oceanic and Atmospheric Administration has documented the presence ...
Plants & Animals
May 20, 2009
0
0
(PhysOrg.com) -- Professor Roger Bland is listening in on one of the noisier creatures in San Francisco Bay, using physics to analyze the mating song of the toadfish. While fish don't have vocal chords, they have innovative ...
Plants & Animals
Mar 25, 2009
0
0
Ocean-based hydrophones in the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO)'s seismic-acoustic monitoring network could provide a better look at how ocean temperatures are changing over time, according to a ...
Earth Sciences
Apr 18, 2023
0
3
A hydrophone (Greek "hydro" = "water" and "phone" = "sound") is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change. Such piezoelectric materials, or transducers can convert a sound signal into an electrical signal since sound is a pressure wave. Some transducers can also serve as a projector, but not all have this capability, and may be destroyed if used in such a manner.
A hydrophone can "listen" to sound in air, but will be less sensitive due to its design as having a good acoustic impedance match to water, the denser fluid. Likewise, a microphone can be buried in the ground, or immersed in water if it is put in a waterproof container, but will give similarly poor performance due to the similarly bad acoustic impedance match.
This text uses material from Wikipedia, licensed under CC BY-SA
