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Ultrasonography

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Related Experiment Video

Updated: Nov 7, 2025

Controllable Nucleation of Cavitation from Plasmonic Gold Nanoparticles for Enhancing High Intensity Focused Ultrasound Applications

Controllable Nucleation of Cavitation from Plasmonic Gold Nanoparticles for Enhancing High Intensity Focused Ultrasound Applications

Published on: October 5, 2018

Underwater ultra-low frequency seismic source.

Andrey K Morozov¹

¹Teledyne Marine, North Falmouth, Massachusetts 02556, USA.

The Journal of the Acoustical Society of America

|May 4, 2021

Summary

This summary is machine-generated.

A novel underwater seismic source generates ultra-low frequency sound (2-8 Hz) essential for geophysical full waveform inversion. This powerful, pneumatically driven bubble resonator achieves high source levels for advanced seismic surveys.

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Area of Science:

Geophysics
Acoustics
Ocean Engineering

Background:

Ultra-low frequency (2-8 Hz) sound is crucial for geophysical methods like full waveform inversion.
Generating powerful ultra-low frequency sound underwater presents significant engineering challenges.
Existing sources struggle to achieve the necessary volume displacement and radiation area.

Purpose of the Study:

To develop and test a novel, powerful underwater seismic source capable of generating ultra-low frequency sound.
To investigate the acoustic physics and hydrodynamics of a large underwater bubble resonator.
To evaluate the source's performance for geophysical applications.

Main Methods:

Design and construction of a pneumatically driven bubble resonator with an internal Helmholtz resonator.
Finite element analysis of near-field hydrodynamics and acoustic-gravitational effects.
Experimental testing and source level measurements at the Woods Hole Oceanographic Institution.

Main Results:

The developed seismic bubble source demonstrates a larger volume displacement and radiation area than previous prototypes.
Acoustic-gravitational effects and transition losses were analyzed.
The prototype achieved a source level sufficient for geophysical full waveform inversion.

Conclusions:

The novel ultra-low frequency seismic source is effective for geophysical surveys.
The design overcomes limitations of existing ultra-low frequency sound generation methods.
The technology advances capabilities in underwater acoustic research and geophysical exploration.