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Localization of weak objects in reverberant fields using waveform inversion.

Kamyar Firouzi1, Butrus T Khuri-Yakub1

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This study uses waveform inversion to locate objects in reverberant environments, even with few measurements. This method leverages complex wave reflections for accurate object localization.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Wave Phenomena

Background:

  • Reverberant fields in enclosures contain information but are often incoherent due to multiple wave reflections, diffraction, and dispersion.
  • This incoherency can lead to a seemingly random mixing of wave energy.
  • Despite incoherency, wave energy spreading allows for multiple interrogations of enclosure points, sensing substructural changes.

Purpose of the Study:

  • To apply the waveform inversion approach for object localization in reverberant fields.
  • To address challenges posed by limited spatial measurements.
  • To develop a localization scheme that effectively utilizes reverberant field properties.

Main Methods:

  • Waveform inversion technique applied to acoustic data.
  • Analysis of reverberant sound fields and wave energy flow.
  • Exploitation of temporal information within the measured data.

Main Results:

  • Demonstration of object localization in reverberant environments.
  • Successful application with a reduced number of spatial measurements.
  • Validation of the waveform inversion approach for sensing substructural changes via wave energy flow.

Conclusions:

  • The waveform inversion approach is effective for object localization in reverberant fields.
  • The method significantly reduces the need for extensive spatial measurements.
  • Reverberant fields, when properly analyzed, provide valuable data for accurate localization.