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An electrical instrument for detecting or monitoring sound under water.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Electronics) an electroacoustic transducer that converts sound or ultrasonic waves travelling through water into electrical oscillations
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhaɪ drəˌfoʊn)

a device for detecting sounds transmitted through water, as for locating submarines or measuring the flow of water through a pipe.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Pro Sound Effects' latest library,Submerged,used a hydrophone to put together the collection of underwater sounds.
By using a Microelectromechanical Systems (MEMS) fabrication process for integrated circuits (ICs) [9, 10], the ultrasonic hydrophone allows the combination of signal and image processing circuits, such as amplifier and filter circuits, allowing sensitivity to be improved.
Alternatively, stationary receiver/ hydrophone arrays have been used to cordon off marine areas and detect tagged individuals moving within reception range (Voegeli et al., 2001; Simpfendorfer et al., 2002; Welch et al., 2003; Grothues and Able, 2007; Bishop et al., 2010).
Underwater noise is measured with an underwater microphone known as a hydrophone. The unit of measurement for underwater noise, or sound pressure level, is the same as for airborne SPL, the Pascal.
It consists of two SAS systems: a high frequency (HF) synthetic aperture sonar and a long-wavelength broadband (BB) synthetic aperture sonar, wherein two separate projectors share a common hydrophone array, as shown in Figure 1.
The receiving single channel hydrophone was towed parallel to the boomer sound source at a horizontal offset to allow clear data interpretation.
By using a simple underwater recording device called a hydrophone, scientists are able to eavesdrop on coral reef communities.
AoFunding has allowed the ESO to acquire a hydrophone and audio recording device which will allow us to undertake comparative studies of whale song within Oman and between neighbouring countries,Ao said Lamees Daar, ESOAAEs executive director
A hydrophone could listen for whale calls all right, but these hydrophones hung on a mooring line "that clanked and yanked," said John Kemp, head of at-sea operations for the WHOI Mooring Operations, Engineering, and Field Support Group.
"In the 17 years we've been monitoring the ocean through hydrophone recordings, we've never seen a swarm of earthquakes in an area such as this," said Robert Dziak, a marine geologist with Oregon State University.