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Special Issue "Underwater Acoustic Sensors and Applications"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Physical Sensors".

Deadline for manuscript submissions: 30 June 2021.

Special Issue Editor

Dr. Manuel Bou-Cabo
Guest Editor
Instituto Español de Oceanografía (IEO), Mixed unit UPV-IEO, Paranimf 1,46730 Grau de Gandia, València, Spain
Interests: acoustics; underwater acoustics; underwater noise pollution; passive acoustics; acoustic piezoelectric sensors

Special Issue Information

Dear Colleagues,

Underwater acoustic sensors play a relevant role in several fields of knowledge in relation with underwater environment. Underwater acoustics has been revealed as a useful tool with countless applications allowing to perform studies of biomass calculations for fishering purposes, ecological assessment in relation with noise pollution, bioacoustic studies related with marine mammals or soundscape assesment using acoustic indicators, among other applications. In adittion, technological development related with engineering applications is constantly evolving, covering topics from underwater wireless communicactions, to positioning systems with high accuracy. The evaluation of underwater noise and the study of its influence on the environment has become a subject of high priority during the last few years thanks to the efforts of organizations and public institutions like the World Health Organization, the International Maritime Organization or the European Union through the implementation of Marine Strategy Frameworok Directive (2017/56/EC; hereafter MSFD).
The main objective of this issue is to put together the research activities, developments, and new applications in the field of underwater acoustics sensors and signal processing techniques.
Articles could include but are not limited to the following topics:

  • New developments on monitoring passive acoustic systems;
  • Activities on new metrics related to underwater noise assessment;
  • Calibration of passive acoustic devices, especially at low frequencies;
  • Signal processing techniques related to underwater noise applications;
  • Monitoring systems applied to bioacoustics studies (from marine mammals to soundscape studies);
  • Develop particle motion devices (from measuring to calibration standards proposals);
  • Industrial applications of underwater acoustic devices;
  • Biomass estimation, and activities related to monitoring of fish farms using ultrasound projectors/receivers;
  • Mitigation measurements, linked to impulsive noise;
  • Activities linked to standardization of ship noise signature measurements. 

Dr. Manuel Bou-Cabo
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • Underwater acoustics
  • Calibration of acoustic sensors
  • Underwater noise pollution assessment
  • Marine Strategy Framework Directive implementation (related to D11 descriptor)
  • Underwater Wireless communication
  • Piezoelectric transducers
  • Affection of noise to the marine environment
  • Application of underwater acoustics to human activities on the sea

Published Papers (1 paper)

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Open AccessCommunication
Research and Fabrication of Broadband Ring Flextensional Underwater Transducer
Sensors 2021, 21(4), 1548; - 23 Feb 2021
At present, high-speed underwater acoustic communication requires underwater transducers with the characteristics of low frequency and broadband. The low-frequency transducers also are expected to be low-frequency directional for realization of point-to-point communication. In order to achieve the above targets, this paper proposes a [...] Read more.
At present, high-speed underwater acoustic communication requires underwater transducers with the characteristics of low frequency and broadband. The low-frequency transducers also are expected to be low-frequency directional for realization of point-to-point communication. In order to achieve the above targets, this paper proposes a new type of flextensional transducer which is constructed of double mosaic piezoelectric ceramic rings and spherical cap metal shells. The transducer realizes broadband transmission by means of the coupling between radial vibration of the piezoelectric rings and high-order flexural vibration of the spherical cap metal shells. The low-frequency directional transmission of the transducer is realized by using excitation signals with different amplitude and phase on two mosaic piezoelectric rings. The relationship between transmitting voltage response (TVR), resonance frequency and structural parameters of the transducer is analyzed by finite element software COMSOL. The broadband performance of the transducer is also optimized. On this basis, the low-frequency directivity of the transducer is further analyzed and the ratio of the excitation signals of the two piezoelectric rings is obtained. Finally, a prototype of the broadband ring flextensional underwater transducer is fabricated according to the results of simulation. The electroacoustic performance of the transducer is tested in an anechoic water tank. Experimental results show that the maximum TVR of the transducer is 147.2 dB and the operation bandwidth is 1.5–4 kHz, which means that the transducer has good low-frequency, broadband transmission capability. Meanwhile, cardioid directivity is obtained at 1.4 kHz and low-frequency directivity is realized. Full article
(This article belongs to the Special Issue Underwater Acoustic Sensors and Applications)
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