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Eddy-current non-inertial displacement sensing for underwater infrasound measurements
Author(s) -
Dimitri Donskoy,
Benjamin A. Cray
Publication year - 2011
Publication title -
the journal of the acoustical society of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.619
H-Index - 187
eISSN - 1520-8524
pISSN - 0001-4966
DOI - 10.1121/1.3577576
Subject(s) - acoustics , geophone , underwater , infrasound , displacement (psychology) , sensitivity (control systems) , accelerometer , current (fluid) , seismometer , eddy current , geology , observatory , remote sensing , physics , seismology , electronic engineering , engineering , psychology , oceanography , quantum mechanics , psychotherapist , astrophysics
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.

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