Hydrophone ≈ Hydrophone
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The Watermark Benchmark for Underwater Acoustic Modulation Schemes Open
International audience
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Deep-learning source localization using multi-frequency magnitude-only data Open
A deep learning approach based on big data is proposed to locate broadband acoustic sources using a single hydrophone in ocean waveguides with uncertain bottom parameters. Several 50-layer residual neural networks, trained on a huge number…
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Slowing deep-sea commercial vessels reduces underwater radiated noise Open
During 2017, the Vancouver Fraser Port Authority's Enhancing Cetacean Habitat and Observation program carried out a two-month voluntary vessel slowdown trial to determine whether slowing to 11 knots was an effective method for reducing und…
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Distributed optical fiber hydrophone based on Φ-OTDR and its field test Open
In this letter, a distributed optical fiber hydrophone (DOFH) based on Φ-OTDR is demonstrated and tested in the field. The specially designed sensitized optical cable with sensitivity up to −146 dB rad/µPa/m is introduced, and an array sig…
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Underwater Ambient Noise Open
Underwater ambient noise is primarily a background noise which is a function of time, location, and depth. Background baseline of the noise in ocean is represented by ambient noise generated from the ocean surface due to wind and rain. Thi…
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Passive acoustic monitoring of bed load discharge in a large gravel bed river Open
Surrogate technologies to monitor bed load discharge have been developed to supplement and ultimately take over traditional direct methods. Our research deals with passive acoustic monitoring of bed load flux using a hydrophone continuousl…
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Real-time observations of the impact of COVID-19 on underwater noise Open
A slowdown in global trade activity due to COVID-19 has led to a reduction in commercial shipping traffic into the Port of Vancouver. The Ocean Networks Canada observatory system provides researchers real-time access to oceanographic data …
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Nonlinear time-warping made simple: A step-by-step tutorial on underwater acoustic modal separation with a single hydrophone Open
Classical ocean acoustic experiments involve the use of synchronized arrays of sensors. However, the need to cover large areas and/or the use of small robotic platforms has evoked interest in single-hydrophone processing methods for locali…
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Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean Open
RHUM-RUM is a German-French seismological experiment based on the sea floor surrounding the island of La Réunion, western Indian Ocean (Barruol and Sigloch, 2013). Its primary objective is to clarify the presence or absence of a mantle plu…
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A Photoacoustic Imaging Device Using Piezoelectric Micromachined Ultrasound Transducers (PMUTs) Open
A linear piezoelectric micromachined ultrasound transducer (PMUT) array was fabricated and integrated into a device for photoacoustic imaging (PAI) of tissue phantoms. The PMUT contained 65 array elements, with each element having 60 diaph…
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Vibroacoustic Measurements for Detecting Water Leaks in Buried Small-Diameter Plastic Pipes Open
Leak detection is an essential topic within the policies of water loss management in drinking-water supply networks. This paper reports the results of an experimental campaign performed for assessing the sensitivity to water leaks of measu…
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Autocorrelation Analysis of Vibro-Acoustic Signals Measured in a Test Field for Water Leak Detection Open
Reducing losses in water distribution networks is a worldwide challenge and all utilities are developing proper strategies for the active control of leaks. Temporary or permanent grids of units for the continuous monitoring of pipelines th…
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Convolutional neural networks for passive monitoring of a shallow water environment using a single sensor Open
A cost effective approach to remote monitoring of protected areas such as\nmarine reserves and restricted naval waters is to use passive sonar to detect,\nclassify, localize, and track marine vessel activity (including small boats and\naut…
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Numerical 3D flow simulation of ultrasonic horns with attached cavitation structures and assessment of flow aggressiveness and cavitation erosion sensitive wall zones Open
As a contribution to a better understanding of cavitation erosion mechanisms, a compressible inviscid finite volume flow solver with barotropic homogeneous liquid-vapor mixture cavitation model is applied to ultrasonic horn set-ups with an…
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Energy changes during use of high-power ultrasound on food grade surfaces Open
The energy changes experienced during application of high-power ultrasound in cleaning biofilms from food-grade surfaces was investigated in this study. Laboratory scale experiments were conducted using 24 kHz ultrasound frequency with an …
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Intensification of ultrasonic-assisted crude oil demulsification based on acoustic field distribution data Open
Water removal is an essential step during crude oil production due to several problems such as increased transportation costs and high corrosion rate due to dissolved salts. Indirect low frequency ultrasonic energy (US), using baths, has b…
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An analysis of the acoustic cavitation noise spectrum: The role of periodic shock waves Open
Research on applications of acoustic cavitation is often reported in terms of the features within the spectrum of the emissions gathered during cavitation occurrence. There is, however, limited understanding as to the contribution of speci…
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Seabed and range estimation of impulsive time series using a convolutional neural network Open
In ocean acoustics, many types of optimizations have been employed to locate acoustic sources and estimate the properties of the seabed. How these tasks can take advantage of recent advances in deep learning remains as open questions, espe…
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The sense of hearing in the Pacific oyster, Magallana gigas Open
There is an increasing concern that anthropogenic noise could have a significant impact on the marine environment, but there is still insufficient data for most invertebrates. What do they perceive? We investigated this question in oysters…
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Non-linear Acoustic Emissions from Therapeutically Driven Contrast Agent Microbubbles Open
Non-linear emissions from microbubbles introduced to the vasculature for exposure to focused ultrasound are routinely monitored for assessment of therapy and avoidance of irreversible tissue damage. Yet the bubble-based mechanistic source …
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Vocalisation rates of the North Atlantic right whale (Eubalaena glacialis) Open
Vocalisation rates were measured from North Atlantic right whales (Eubalaena glacialis) in spring 1999-2000 in the Great South Channel and off Cape Cod, USA, and in summer 1999-2000 in the Bay of Fundy, Canada. Vocalisations were classed a…
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Ship Type Classification by Convolutional Neural Networks with Auditory-Like Mechanisms Open
Ship type classification with radiated noise helps monitor the noise of shipping around the hydrophone deployment site. This paper introduces a convolutional neural network with several auditory-like mechanisms for ship type classification…
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Low cost, high performance white-light fiber-optic hydrophone system with a trackable working point Open
A working-point trackable fiber-optic hydrophone with high acoustic resolution is proposed and experimentally demonstrated. The sensor is based on a polydimethylsiloxane (PDMS) cavity molded at the end of a single-mode fiber, acting as a l…
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Temporal–spatial, spectral, and source level distributions of fin whale vocalizations in the Norwegian Sea observed with a coherent hydrophone array Open
To better understand fin whale vocalization behaviour in the Norwegian and Barents Seas, a large-aperture densely sampled coherent hydrophone array was deployed in late winter 2014 to monitor their vocalizations instantaneously over wide a…
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Hydrophone Measurements for Biomedical Ultrasound Applications: A Review Open
This article presents basic principles of hydrophone measurements, including mechanisms of action for various hydrophone designs, sensitivity and directivity calibration procedures, practical considerations for performing measurements, sig…
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Investigation of the repeatability and reproducibility of hydrophone measurements of medical ultrasound fields Open
Accurate measurements of acoustic pressure are required for characterisation of ultrasonic transducers and for experimental validation of models of ultrasound propagation. Errors in measured pressure can arise from a variety of sources, in…
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Continuous monitoring of noise levels in the Gulf of Catania (Ionian Sea). Study of correlation with ship traffic Open
Acoustic noise levels were measured in the Gulf of Catania (Ionian Sea) from July 2012 to May 2013 by a low frequency (<1000Hz) hydrophone, installed on board the NEMO-SN1 multidisciplinary observatory. NEMO-SN1 is a cabled node of EMSO-ER…
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Comparison Between Ray-Tracing and Full-Wave Simulation for Transcranial Ultrasound Focusing on a Clinical System Using the Transfer Matrix Formalism Open
Only one high-intensity focused ultrasound device has been clinically approved for transcranial brain surgery at the time of writing. The device operates within 650 and 720 kHz and corrects the phase distortions induced by the skull of eac…
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MEMS Hydrophone Signal Denoising and Baseline Drift Removal Algorithm Based on Parameter-Optimized Variational Mode Decomposition and Correlation Coefficient Open
Underwater acoustic technology is an important means of detecting the ocean. Due to the complex influence of the marine environment, there is a lot of noise and baseline drift in the signals collected by hydrophones. In order to solve this…
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Marine mammal tracks from two-hydrophone acoustic recordings made with a glider Open
A multinational oceanographic and acoustic sea experiment was carried out in the summer of 2014 off the western coast of the island of Sardinia, Mediterranean Sea. During this experiment, an underwater glider fitted with two hydrophones wa…