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Related Experiment Videos

Time-averaged in-line digital holographic interferometry for vibration analysis.

Anand Asundi1, Vijay Raj Singh

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.

Applied Optics
|April 21, 2006
PubMed
Summary

Time-averaged digital holography enables simultaneous measurement of vibration mode shapes and static deformation. This method numerically separates fringe patterns for precise vibration analysis of small membranes.

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Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Materials Science

Background:

  • Digital holography is a powerful tool for non-contact measurement.
  • Vibration analysis often requires separating dynamic and static deformations.
  • Existing methods may struggle with simultaneous determination of mode shape and static state.

Purpose of the Study:

  • To apply time-averaged in-line digital holography for simultaneous vibration analysis.
  • To demonstrate the simultaneous determination of vibration mode shape and mean static deformation.
  • To numerically separate mixed fringe patterns for enhanced analysis.

Main Methods:

  • Utilizing a double-exposure approach with time-averaged in-line digital holography.
  • Recording two digital holograms at the same resonant frequency with slight amplitude differences.

Related Experiment Videos

  • Numerically reconstructing and subtracting the digital holograms.
  • Separating time-averaged Bessel-type fringes and double-exposure fringes.

    • Main Results:

    • Simultaneous determination of vibration mode shape and mean static deformation is achieved.
    • Subtraction of holograms reveals mixed fringe patterns.
    • Numerical separation of these mixed fringe patterns is demonstrated as effective.
    • Successful experimental demonstration on small membranes.

    Conclusions:

    • Time-averaged in-line digital holography with a double-exposure approach is effective for vibration analysis.
    • The method allows for the simultaneous measurement of dynamic and static deformations.
    • Numerical processing enables the separation of complex fringe patterns for accurate results.