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Research Application of Laser-Induced Shock Wave for Studying Blast-Induced Cochlear Injury
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Detecting blast-induced infrasound in wind noise.

Wheeler B Howard1, Kevin L Dillion, F Douglas Shields

  • 1University of Mississippi National Center for Physical Acoustics, 1 Coliseum Drive, University, Mississippi 38677, USA. wbhoward@olemiss.edu

The Journal of the Acoustical Society of America
|March 25, 2010
PubMed
Summary

This study demonstrates a distributed array effectively detects infrasound signals from atmospheric detonations. Array processing techniques successfully localized blast-induced signals, even amidst challenging wind noise conditions.

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Area of Science:

  • Geophysics and Atmospheric Science
  • Acoustic Monitoring and Signal Processing

Background:

  • Natural phenomena like volcanic eruptions, hurricanes, earthquakes, and tsunamis generate infrasound, a crucial area for scientific monitoring.
  • Detecting these infrasound signals is often hindered by ambient wind noise, posing a significant challenge for accurate analysis.

Purpose of the Study:

  • To evaluate the efficacy of a distributed array system in detecting infrasound signals from controlled atmospheric detonations.
  • To assess the capability of array processing techniques to overcome wind noise interference for signal localization.

Main Methods:

  • Utilized a distributed array to record infrasound data from four atmospheric detonations at White Sands Missile Range.
  • Employed array processing techniques to analyze the recorded signals and identify blast-induced acoustic events.
  • Compared signal detectability and localization under varying wind noise conditions.

Main Results:

  • Three out of four atmospheric detonations were successfully detected and localized using the distributed array during periods of low wind noise.
  • Signal processing techniques demonstrated success in localizing one blast-induced signal despite the presence of significant wind noise.
  • High wind conditions presented a challenge, obscuring one of the detonation signals.

Conclusions:

  • Distributed arrays are a viable tool for detecting infrasound from atmospheric events, including detonations.
  • Array processing offers a robust method for localizing infrasound sources, even in noisy environments.
  • Further research may focus on improving signal detection in extreme wind conditions.