Eddy-Current Non-Inertial Displacement Sensing for Underwater Infrasound Measurements

Abstract

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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Document Details

Document Type
Technical Report
Publication Date
May 01, 2011
Accession Number
ADA546375

Entities

People

  • Benjamin A. Cray
  • Dimitri M. Donskoy

Organizations

  • Naval Undersea Warfare Center

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Velocity
  • Acoustic Waves
  • Acoustics
  • Coils
  • Detectors
  • Displacement
  • Eddy Currents
  • Fluid Mechanics
  • Frequency
  • Frequency Response
  • Geophones
  • Measurement
  • Measuring Instruments
  • Sensitivity
  • Undersea Warfare
  • Waves

Fields of Study

  • Environmental science

Readers

  • Acoustical Oceanography.
  • Phased Array Antenna Design.