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 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
0
1099
Cows moo. Wolves howl. Birds tweet. And fish, it turns out, make all sorts of ruckus.
Plants & Animals
Mar 2, 2022
0
132
A new study from North Carolina State University reveals that the soundscapes of coral reef ecosystems can recover quickly from severe weather events such as hurricanes. The work also demonstrates that non-invasive monitoring ...
Ecology
Feb 24, 2021
0
9
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
A research team has successfully recorded the sound of methane bubbles from the seafloor off the Oregon coast using a hydrophone, opening the door to using acoustics to identify—and perhaps quantify—this important greenhouse ...
Environment
Jun 26, 2018
0
14
For centuries poets and writers have imagined the depths of the ocean as eerily quiet. But scientists now know that the oceans, and especially coastal areas, are full of sound from both natural and human activities. Starting ...
Plants & Animals
Apr 25, 2018
0
38
For what may be the first time, NOAA and partner scientists eavesdropped on the deepest part of the world's ocean and instead of finding a sea of silence, discovered a cacophony of sounds both natural and caused by humans.
Earth Sciences
Mar 2, 2016
0
39
For more than a year, scientists at Oregon State University's Hatfield Marine Science Center deployed a hydrophone in 50 meters of water just off the coast of Newport, Ore., so they could listen to the natural and human-induced ...
Ecology
Aug 21, 2013
0
0
(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
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
