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Development of an accelerometer-based underwater acoustic intensity sensor.

Kang Kim1, Thomas B Gabrielson, Gerald C Lauchle

  • 1The Pennsylvania State University, Graduate Program in Acoustics, 217 Applied Science Building, University Park, Pennsylvania 16802, USA. kangkim@umich.edu

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A novel underwater acoustic intensity sensor, the p-a intensity probe, measures acoustic intensity using simultaneous pressure and particle acceleration data. This innovative sensor design enables precise acoustic measurements in underwater environments.

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Area of Science:

  • Acoustics
  • Oceanography
  • Sensor Technology

Background:

  • Underwater acoustic intensity measurement is crucial for various applications, including sonar and environmental monitoring.
  • Existing methods may have limitations in accuracy or spatial resolution.
  • A need exists for a compact, accurate sensor capable of direct acoustic intensity determination.

Purpose of the Study:

  • To describe a new underwater acoustic intensity sensor, termed the p-a intensity probe.
  • To detail the design principles and construction of this novel sensor.
  • To evaluate the performance of the p-a intensity probe.

Main Methods:

  • The sensor integrates a hollow piezoceramic cylinder for pressure sensing with co-located miniature accelerometers for particle acceleration measurement.
  • Symmetric placement of accelerometers ensures measurement of rigid body motion and coincident effective centers.
  • The probe is ballasted for near-neutral buoyancy for stable deployment.

Main Results:

  • The p-a intensity probe successfully derives acoustic intensity from simultaneous pressure and particle acceleration.
  • The sensor design facilitates coincident measurement points for pressure and acceleration.
  • Performance validation was achieved by comparison with a reference hydrophone in a reactive acoustic field.

Conclusions:

  • The developed p-a intensity probe offers a direct method for measuring underwater acoustic intensity.
  • The sensor's design addresses key challenges in co-located pressure and acceleration measurement.
  • This technology has potential for enhanced underwater acoustic monitoring and analysis.