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Underwater microphone
A hydrophone (Ancient Greek: ὕδωρ + φωνή, lit. 'water + sound') is a microphone designed for underwater use, for recording or listening to underwater sound
Hydrophone
List of unidentified or formerly unidentified sounds
Atmospheric Administration (NOAA) using its Equatorial Pacific Ocean autonomous hydrophone array. Researchers have since posited volcanic and glacial origins for
List_of_unexplained_sounds
Deepest oceanic trench on Earth
the subsurface water cycle. Using both ocean-bottom seismometers and hydrophones, the scientists were able to map structures as deep as 97 kilometers
Mariana_Trench
Hydrophone array used on Nazi Germany's U-boats in World War II
The Gruppenhorchgerät ('group listening device', abbreviated GHG) was a hydrophone array which was used on vessels of the German Kriegsmarine in World War
Gruppenhorchgerät
Unexplained underwater sound
Oceanic and Atmospheric Administration's (NOAA) equatorial autonomous hydrophone arrays. The sound was recorded in August 1991, using the Pacific Marine
Upsweep
Cold War-era passive, fixed array undersea surveillance system
terminating at NAVFAC Barbados on 6 July 1962. The linear arrays with hydrophones placed on slopes within the sound channel enabled beamforming processing
SOSUS
Water layer used in ocean surveillance
southern Indian Ocean (between Africa, Australia and Antarctica), by hydrophones in portions of all five major ocean basins and as distant as the North
SOFAR_channel
Local pressure deviation caused by a sound wave
sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa). A sound wave in a transmission
Sound_pressure
Underwater sound detected in 1997 from a non-tectonic cryoseism (ice quake)
was detected by the Equatorial Pacific Ocean autonomous hydrophone array, a system of hydrophones primarily used to monitor undersea seismicity, ice noise
Bloop
Expendable sonar system dropped/ejected from aircraft or ships
water, sonobuoys have both a radio transmitter above the surface and hydrophone sensors underwater. Sonobuoys are mission-critical platforms for enhancing
Sonobuoy
System of hydrophones
towed array sonar is a system of hydrophones towed behind a submarine or a surface ship on a cable. Trailing the hydrophones behind the vessel, on a cable
Towed_array_sonar
Stage of seismic exploration
locations on the surface by what are known as receivers (geophones or hydrophones). Before seismic data can be acquired, a seismic survey needs to be planned
Seismic_data_acquisition
Chemical or nuclear explosion that occurs underwater
hemisphere, which is primarily ocean. Hydrophone monitoring stations consist of an array of three hydrophones suspended from cables tethered to the ocean
Underwater_explosion
Acoustic sensing method
sound. The British made early use of underwater listening devices called hydrophones. The French physicist Paul Langevin, working with a Russian immigrant
Sonar
2014 aircraft disappearance
Haixun 01, equipped with a hand-held hydrophone, and the Royal Navy's HMS Echo, equipped with a hull-mounted hydrophone, in the search. Operators considered
Malaysia_Airlines_Flight_370
Seamount in the United States of America
in 2004. The volcano has repeatedly been targeted by dives of ROVs. Hydrophones have been placed at the summit and vent during several dives. NW Rota-1
NW_Rota-1
British X-ray crystallographer (1862–1942)
that the best tactic was to listen for the submarines. The Navy had a hydrophone research establishment at Aberdour, Scotland, staffed with navy men. In
William_Henry_Bragg
Global conflict from 1914 to 1918
U-boats to find targets, which significantly lessened losses; after the hydrophone and depth charges were introduced, destroyers could potentially successfully
World_War_I
Method of accurately determining a ship's position
reaching hydrophones at known locations – shore stations, anchored station ships, or moored buoys – at a distance from the ship. Each hydrophone was connected
Radio_acoustic_ranging
Wireless technique of sending and receiving messages through water
ways of employing such communication but the most common is by using hydrophones. Underwater communication is difficult due to factors such as multi-path
Underwater acoustic communication
Underwater_acoustic_communication
Type of midget submarine
very quiet slow-speed running made her almost immune to detection by hydrophone. As Admiral Sir Charles Little, Commander-in-Chief, Portsmouth, put it
Seehund
1945 sinking of a German U-boat by a British submarine
the loudness of the HE. He tracked the U-boat's course by hydrophone and as the hydrophone plot emerged, it was noted that the U-boat was zigzagging.
Sinking_of_U-864
Active submarine volcano in the Northern Mariana Islands
region since the 1960s. Most observations of activity have come from hydrophone recordings or seismograph recordings with very large location uncertainty
Ahyi_Seamount
Species of Arctic dwelling marine mammal
Sample of underwater bearded seal vocalizations taken using a hydrophone
Bearded_seal
Device that generates controlled seismic energy used for seismic surveys
reflect and refract and are recorded by receivers, such as geophones or hydrophones. Seismic sources may be used to investigate shallow subsoil structure
Seismic_source
Species of mammals
behavior of Baird's beaked whales (Berardius bairdii) based on towed hydrophone recordings". Marine Mammal Science. 39: 289–298. doi:10.1111/mms.12958
Baird's_beaked_whale
Type of underwater electro-acoustic transducer
transducer can effectively operate as either a projector (source) or a hydrophone (underwater acoustic receiver). The transducer's size, odd shape, and
Tonpilz
Underwater acoustic positioning system for US Air Force missile testing ranges
bottom-fixed hydrophones connected by cable to the shore stations. A variant, Sonobuoy MILS (SMILS), was composed of bottom mounted hydrophones augmented
Missile Impact Location System
Missile_Impact_Location_System
Royal Navy officer (1919–1988)
chance of being detected themselves. They would rely purely on Venturer's hydrophone (a common, long-used, and far less sophisticated underwater acoustic detection
Jimmy_Launders
Largest living species of dolphin
Wayback Machine – Orcas in Johnstone Strait, British Columbia Salish Sea Hydrophone Network Archived July 9, 2013, at the Wayback Machine – Listen live to
Orca
Gnevny-class destroyer built for the Soviet Navy
or 95 mines and 25 depth charges. They were fitted with a set of Mars hydrophones for anti-submarine work, although they were useless at speeds over 3
Soviet destroyer Besposhchadny
Soviet_destroyer_Besposhchadny
Destroyer of the Soviet Navy
or 95 mines and 25 depth charges. They were fitted with a set of Mars hydrophones for anti-submarine work, although they were useless at speeds over 3
Soviet destroyer Reshitelny (1940)
Soviet_destroyer_Reshitelny_(1940)
Naval warfare force of the United Kingdom
weaponry reinforced, while new technologies, such as ASDIC, Huff-Duff and hydrophones, were developed. At the start of World War II in 1939, the Royal Navy
Royal_Navy
Swedish destroyer and museum ship
warfare, there was a hydrophone housed in a dome under the forebody which could be retracted into the hull when the hydrophone was not used. When a submarine
HSwMS_Småland_(J19)
Exploration of subsurface properties with seismology
interface and be detected by an array of receivers (such as geophones, hydrophones, and DAS) at the surface. Knowing the travel times from the source to
Reflection_seismology
Whale who calls at unusual frequency
The whale itself has never been sighted: it has only been heard via hydrophones, but its call has been detected since the late 1980s in a pattern that
52-hertz_whale
Hydraulic musical instrument
embodiments, is electrically amplified by a hydrophone. In one embodiment, there is a further processing of each hydrophone signal. Embodiments with various kinds
Hydraulophone
Attack submarine in the Italian Navy
sonar) CIA (Cylindrical intercept array) ONA HYD (own noise analysis hydrophones) SBE 1 (sonar beacon / distress pinger) SB 3050 2G (multi-beam echosounder)
U212_NFS_submarine
Aircraft carrier of the Imperial Japanese Navy
Model 1 radar mounted at the top of the foremast. A Type 93 passive hydrophone system was intended be fitted in the bow. The cruisers were designed to
Japanese_cruiser_Ibuki_(1943)
Underwater vents or fissures in the Earth's surface from which magma can erupt
deep-sea volcanoes can be difficult to detect at great distances using hydrophones.[citation needed] The critical temperature and pressure increase in solutions
Submarine_volcano
Power spectrum of a noise signal
thermal noise of water has a violet spectrum, causing it to dominate hydrophone measurements at high frequencies. "Predictions of the thermal noise spectrum
Colors_of_noise
1975 studio album by Max Eastley and David Toop
Side A No. Title Writer(s) Length 1. "Hydrophone" Max Eastley 8:59 2. "Metallophone" Max Eastley 7:02 3. "The Centriphone" Max Eastley 4:48 4. "Elastic
New and Rediscovered Musical Instruments
New_and_Rediscovered_Musical_Instruments
technology for studying seamount eruptions did not exist until advancements in hydrophone technology made it possible to "listen" to acoustic waves, known as T-waves
Volcanic_eruption
Method to visualize density variations in transparent media
quantitative acoustic measurement is the hydrophone. However, scanning the acoustic field with a hydrophone suffers from several limitations, giving rise
Schlieren_imaging
Signal processing technique for sensor arrays
technique involves combining delayed signals from each hydrophone at slightly different times (the hydrophone closest to the target will be combined after the
Beamforming
Open ocean research platform
surface were measured; ambient noise intensity and direction using vertical hydrophone arrays suspended from FLIP and horizontal arrays (DIMUS) at the bottom
RP_FLIP
Torpedo of the German Navy
between 10 (18 km/h) and 18 knots (33 km/h). The homing system consisted of hydrophone receivers and altered the direction of the rudder via an electropneumatic
G7es_torpedo
Soviet Navy's Gnevny-class destroyer
or 95 mines and 25 depth charges. They were fitted with a set of Mars hydrophones for anti-submarine work, although they were useless at speeds over 3
Soviet destroyer Gnevny (1936)
Soviet_destroyer_Gnevny_(1936)
1974 CIA project to recover the sunken Soviet submarine K-129
returned to normal. The US Navy analyzed acoustic data recorded by the SOSUS hydrophone network in the northern Pacific—four AFTAC sites and the Adak, Alaska
Project_Azorian
Island off the coast of Antarctica
July 2021). "Elephant Island: An Oasis for Fin Whales in an Icy Sea; A hydrophone reveals a vital Antarctic feeding and breeding ground for the world's
Elephant_Island
Search for a missing Boeing 777 in the southern Indian Ocean
CTBTO hydrophones located south-west of Cape Leeuwin, Western Australia (HA01) and in the northern Indian Ocean. These stations have two hydrophones each
Search for Malaysia Airlines Flight 370
Search_for_Malaysia_Airlines_Flight_370
Helicopter dipping sonar system
elements in a submersible unit, the reel & cable and reeling machine. The hydrophone and projector elements are housed within the submersible unit or transducer
AN/AQS-13
Class of diesel-electric submarine
periscope (optronic mast system, laser rangefinder) Other sensors: WASS hydrophones Communication systems: Batch 1: Mast buoy: Gabler Maschinenbau Callisto
Type_212A_submarine
German battleship of World War II
Iceland. The ships were forced to zigzag to avoid ice floes. At 19:22, hydrophone and radar operators aboard the German warships detected the cruiser HMS Suffolk
German_battleship_Bismarck
Type of navigation system
systems use transducers or hydrophones, which function as both sound transmitters and receivers. The transducers/hydrophones emit sound waves, and the
Acoustic_homing
Device that converts sound into an electrical signal
difference between the front and back pickup. Three such cardioid microphones/hydrophones could be orthogonally oriented as a collocated triad to improve the gain
Microphone
Submarine of the Royal Navy
total of a dozen torpedoes. They were equipped with an array of five hydrophones in the bow to allow them to locate and engage targets while submerged
HMS_R8
Film by Denis Villeneuve
such as recording the sounds of shifting sands in Death Valley using hydrophones. The Montreal and Vancouver facilities of DNEG were used for the Arrakeen
Dune_(2021_film)
Method of measuring the depth of water
current profiler Acoustic seabed classification Acoustical oceanography Hydrophone Long baseline acoustic positioning system Ocean acoustic tomography Short
Echo_sounding
British journalist and historian (1866–1940)
Record of German Crimes (1917) Battleships in Action (1919) Hush, or the Hydrophone Service (1920) Northcliffe House (1927) The War Guilt (1928) His Majesty
Herbert_Wrigley_Wilson
1943 class of Japanese escort ships
Type 94 depth charge launchers and had a Model 93 sonar and a Type 93 hydrophone. Later in the war, a third Type 94 depth charge launcher was added on
Mikura-class_escort_ship
Electronics component
second-harmonic imaging. Also some experiments have been performed to use CMUTs as hydrophones. Surface micromachining is the traditional way of manufacturing CMUTs
Capacitive micromachined ultrasonic transducer
Capacitive_micromachined_ultrasonic_transducer
Japanese ocean liner
epithet of "hell ship." In February 1943, Asama Maru was fitted with a hydrophone and rack for 16 depth charges. She narrowly escaped four torpedoes fired
MV_Asama_Maru
Rupture in a planet's crust where material escapes
of steam and gases; however, submarine eruptions can be detected by hydrophones and by the discoloration of water because of volcanic gases. Pillow lava
Volcano
waves at bottom mounted hydrophones in the deep sound channel, another name for the SOFAR channel, where the receiving hydrophone lies on or near a steep
RV_Sir_Horace_Lamb
Vibrational energy transfer in Earth or other planetary body
are studied by seismologists, who record the waves using seismometers, hydrophones (in water), or accelerometers. Seismic waves are distinguished from seismic
Seismic_wave
US Navy light cruiser class
last broadside cruisers designed anywhere. Additional torpedo tubes and hydrophone installation was ordered. As a result of the design changes placed on
Omaha-class_cruiser
The Whale Museum is also a partner in the Salish Sea Hydrophone Network, SeaSound. The hydrophones detect whale vocalizations, vessel noise and other underwater
The_Whale_Museum
Buoyancy-propelled autonomous undersea vehicle
latest generation "ZRay" model was completed; it includes a 27 channel hydrophone array. Its function is to track and automatically identify marine mammals
Liberdade class underwater glider
Liberdade_class_underwater_glider
Gruppenführer – squad leader, also a Nazi party rank. Gruppenhorchgerät (GHG) – hydrophone array. Gulaschkanone – "goulash cannon", mobile field kitchen Gruppenstab
Glossary of German military terms
Glossary_of_German_military_terms
SC-1-class submarine chaser of the United States Navy
capability. Submarine detection was handled by Submarine Signal Company hydrophones, of which three types were in general use aboard SC-1-class boats. The
USS_SC-25
Yamato-class battleship of the Imperial Japanese Navy
short-range directors for the 25 mm AA guns. Musashi was built with a Type 0 hydrophone system in her bow, usable only while stationary or at low speed. In September
Japanese_battleship_Musashi
boundaries). The hydrophones detect these reflected sound waves. As the ship moves forwards, the positions of the acoustic source and hydrophones change with
Seismic_oceanography
Unclassified designation system for United States military electronic equipment
heads Magnetic, capacitive, or optical pickup devices, search coils, hydrophones, etc. DU Display Units/Monitors All types that are external devices for
Joint Electronics Type Designation System
Joint_Electronics_Type_Designation_System
Operating mode of submarines
protocol has been in use since the latter part of World War I, when hydrophones were invented to detect U-boats. The propellers have a characteristic
Silent_running_(submarine)
Soviet Juliett-class cruise-missile submarine
Artika-M (MG-200) and Herkules (MG-15) sonars, Feniks-M (MG-10) and MG-13 hydrophones and a Albatros RLK-50 search radar (NATO reporting name: Snoop Tray)
Soviet_submarine_K-70
Swiss physicist
underwater sound signals between England and France via the Channel. Hydrophones used by Colladon (on display at MHS Geneva) First model used to measure
Jean-Daniel_Colladon
the working model was a proposal for hydrophones, cables, processing systems and beamforming so that a hydrophone array could present multiple azimuthal
Low Frequency Analyzer and Recorder
Low_Frequency_Analyzer_and_Recorder
Underwater acoustics scientific consulting firm
a watertight pressure housing. The AMAR can be connected to up to 16 hydrophones and up to 7 oceanographic sensors (e.g., dissolved oxygen, salinity,
JASCO_Applied_Sciences
Royal Research Ship operated by the Natural Environment Research Council
hydroacoustic system in three major parts; a pair of major echosounders plus a hydrophone are installed in a special "blister" installation on the ship's keel,
RRS_Discovery_(2012)
Distinctive whistle of the bottlenose dolphin
identified and studied in the wild or in captivity by researchers using hydrophones. Vocal learning strongly influences the development of signature whistles
Signature_whistle
22 ships and damaging 2 others. UC-3 was caught in a net, detected by hydrophone, and sunk on 23 April 1916 or mined and sunk on 27 May 1916. A Type UC
SM_UC-3
a list of sensors sorted by sensor type. Acoustic radiometer Geophone Hydrophone Microphone Pickup Seismometer Sound locator Air flow meter Air–fuel ratio
List_of_sensors
1996 treaty banning all nuclear weapons testing
monitoring is performed with a system of 11 stations that consist of hydrophone triads to monitor for underwater explosions. Hydroacoustic stations can
Comprehensive Nuclear-Test-Ban Treaty
Comprehensive_Nuclear-Test-Ban_Treaty
1970 studio album by Roger Payne
eerie underwater moaning and wailing sounds while manning a top-secret hydrophone station off the coast of Bermuda, listening for Russian submarines. Payne
Songs of the Humpback Whale (album)
Songs_of_the_Humpback_Whale_(album)
Finnish minelayer
on duty had previously ordered the engines to be stopped so that the hydrophone operators could listen for submarine sounds easier. While the vessel tried
Finnish_minelayer_Riilahti
Raised command platform on a naval vessel
the boat whilst submerged. Some late 1930s designs even located their hydrophone and RADAR operators' stations inside this compartment to maximize the
Conning_tower
Electroacoustic musical instrument
piece; halldorophone combined with EMS modular synthesizers and coral reef hydrophone field recordings; released 12 June 2023 2024 Hommelen Penelope Trappes
Halldorophone
American composer of electronic music
Laptop, Max/MSP, CSound, Pure Data, synthesizer, field recorder, Ardour, hydrophones, electric guitar Years active 1983–present Labels anechoicmedia Silent
Kim_Cascone
Soviet Juliett-class cruise-missile submarine
Artika-M (MG-200) and Herkules (MG-15) sonars, Feniks-M (MG-10) and MG-13 hydrophones and an Albatros RLK-50 search radar (NATO reporting name: Snoop Tray)
Soviet_submarine_K-77
Electric charge generated in certain solids due to mechanical stress
thin quartz crystals carefully glued between two steel plates, and a hydrophone to detect the returned echo. By emitting a high-frequency pulse from the
Piezoelectricity
Study of sound relating to biology
equipment may be required instead of the usual microphone, such as a hydrophone (for underwater sounds), detectors of ultrasound (very high-frequency
Bioacoustics
(28 km/h; 17 mph) Complement 110 Sensors & processing systems Sonar and hydrophones Armament 1 × 100 mm (4 in) / 47 caliber gun 7 × 20 mm (0.79 in) anti-aircraft
Italian_corvette_Baionetta
Destroyer of the Soviet Navy
or 95 mines and 25 depth charges. They were fitted with a set of Mars hydrophones for anti-submarine work, although they were useless at speeds over 3
Soviet destroyer Bditelny (1937)
Soviet_destroyer_Bditelny_(1937)
Destroyer of the Soviet Navy
or 95 mines and 25 depth charges. They were fitted with a set of Mars hydrophones for anti-submarine work, although they were useless at speeds over 3
Soviet destroyer Stremitelny (1937)
Soviet_destroyer_Stremitelny_(1937)
Intergovernmental organization for nuclear-test banning
stations provide data upon request. 11 hydroacoustic monitoring stations (6 hydrophone + 5 T-Phase) The hydroacoustic monitoring system monitors for underwater
Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization
Preparatory_Commission_for_the_Comprehensive_Nuclear-Test-Ban_Treaty_Organization
Sensor that uses optical fiber
hydrophones for seismic and sonar applications. Hydrophone systems with more than one hundred sensors per fiber cable have been developed. Hydrophone
Fiber-optic_sensor
Deep-sea scientific submersible
communicate with the support ship, USS Wandank (ATA-204), using a sonar/hydrophone voice communications system. At a speed of almost 1.6 km/s (1 mi/s) –
Trieste_(bathyscaphe)
Species of whale
behavior of Baird's beaked whales ( Berardius bairdii ) based on towed hydrophone recordings". Marine Mammal Science. 39 (1): 289–298. Bibcode:2023MMamS
Arnoux's_beaked_whale
Heavyweight torpedo
noise-reduction). TP613, ca 1982: Development of the TP612 with passive-hydrophone target-seeker and pistol. Two-way data communications, and engine with
Torped_613
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