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Fast wideband acoustical holography.

Jørgen Hald1

  • 1Brüel and Kjær Sound and Vibration Measurement A/S, Skodsborgvej 307, DK-2850 Nærum, Denmark.

The Journal of the Acoustical Society of America
|April 24, 2016
PubMed
Summary

A new wideband holography method overcomes frequency limitations of traditional acoustical holography and beamforming. This compressed sensing approach uses a single measurement for full-frequency acoustic imaging, offering improved efficiency and resolution.

Area of Science:

  • Acoustics
  • Signal Processing
  • Computational Physics

Background:

  • Traditional near-field acoustical holography (NAH) and beamforming have frequency-dependent resolution limitations.
  • NAH excels at low frequencies, while beamforming is effective at medium-to-high frequencies.
  • Existing methods require conflicting measurement distances for optimal performance.

Purpose of the Study:

  • To develop a wideband holography method overcoming the frequency limitations of NAH and beamforming.
  • To enable accurate acoustic imaging across a broad frequency range with a single measurement setup.
  • To address the practical conflict in measurement distances required by NAH and beamforming.

Main Methods:

  • The developed method employs compressed sensing principles for sparse sound field representation.

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  • It utilizes an irregular array for a single, short-distance measurement.
  • An iterative sparsity-promoting inverse problem solution is used instead of traditional regularization.

    • Main Results:

    • The wideband holography method provides a single result covering the full frequency range.
    • It overcomes the conflicting distance requirements of traditional NAH and beamforming.
    • The iterative solution is computationally efficient and yields comparable results to other methods.

    Conclusions:

    • The new wideband holography method offers a practical solution for acoustic imaging across all frequencies.
    • Compressed sensing principles enable efficient and accurate sound field reconstruction.
    • This approach significantly enhances the versatility and applicability of near-field acoustical holography.