Eddy-current non-inertial displacement sensing for underwater infrasound measurements

A non-inertial sensing approach for an Acoustic Vector Sensor (AVS), which utilizes eddy-current displacement sensors and operates well at Ultra-Low Frequencies (ULF), is described here. In the past, most ULF measurements (from mHertz to approximately 10 Hertz) have been conducted using heavy geopho...

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Veröffentlicht in:	The Journal of the Acoustical Society of America 2011-06, Vol.129 (6), p.EL254-EL259
Hauptverfasser:	Donskoy, Dimitri M., Cray, Benjamin A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustics Acoustics - instrumentation Detection Displacement Eddy current testing Equipment Design Exact sciences and technology Fundamental areas of phenomenology (including applications) Marine Mathematical analysis Measurements common to several branches of physics and astronomy Metrology, measurements and laboratory procedures Models, Theoretical Motion Physics Reproducibility of Results Sensors Signal Processing, Computer-Assisted Sound Sound Spectrography Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements) Time Factors Transducers ULF Underwater Underwater sound Water
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Beschreibung
Zusammenfassung:	A non-inertial sensing approach for an Acoustic Vector Sensor (AVS), which utilizes eddy-current displacement sensors and operates well at Ultra-Low Frequencies (ULF), is described here. In the past, most ULF measurements (from mHertz to approximately 10 Hertz) have been conducted using heavy geophones or seismometers that must be installed on the seafloor; these sensors are not suitable for water column measurements. Currently, there are no readily available compact and affordable underwater AVS that operate within this frequency region. Test results have confirmed the validity of the proposed eddy-current AVS design and have demonstrated high acoustic sensitivity.
ISSN:	0001-4966 1520-8524
DOI:	10.1121/1.3577576