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Related Experiment Videos

Estimating the Green's function using a single channel dual-beam interferometer.

Sam Hitchman1, Kasper van Wijk1, Roel Snieder2

  • 1Faculty of Science, Department of Physics, Dodd-Walls Centre for Photonic and Quantum Technologies, University of Auckland, Private Bag 92019, Auckland 1010, New Zealand.

The Journal of the Acoustical Society of America
|August 5, 2018
PubMed
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This study introduces a novel seismic interferometry technique using wavefield autocorrelation for Green's function estimation. The method offers a cost-effective, non-contacting approach for structural monitoring using seismic data.

Area of Science:

  • Geophysics
  • Materials Science
  • Non-destructive Testing

Background:

  • Seismic interferometry traditionally uses cross-correlation of independent wavefields to estimate the elastic Green's function.
  • Existing methods require specific hardware and processing for accurate Green's function retrieval.

Purpose of the Study:

  • To present and validate a novel seismic interferometry technique utilizing wavefield autocorrelation.
  • To compare this new method with traditional seismic interferometry for Green's function estimation.
  • To explore its application in structural monitoring.

Main Methods:

  • Estimating the elastic Green's function via autocorrelation of the sum of wavefields recorded at two locations in a single channel.
  • Utilizing a pulsed laser for rapid thermoelastic expansion to excite wavefields.

Related Experiment Videos

  • Employing a dual-beam heterodyne interferometer for direct detection of summed wavefields.

    • Main Results:

    • Successfully estimated the elastic Green's function between two points on an aluminum block with surface scatterers.
    • The autocorrelation method yielded results comparable to traditional seismic interferometry, albeit with predictable artifacts.
    • Demonstrated the feasibility of using a single-channel detector for summed wavefield recording.

    Conclusions:

    • The proposed autocorrelation technique is a viable alternative for Green's function estimation.
    • This method presents a low-cost, non-contacting solution for structural health monitoring.
    • Effective in environments with established equipartitioned wavefields from ambient noise.