Identification of antinodes and zero-surface-strain contours of flexural vibration with time-averaged speckle pattern shearing interferometry

Wai On Wong, K. T. Chan, T. P. Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


A new time-averaged frame subtraction technique is introduced for vibration analysis by digital speckle shearing interferometry. The technique permits the enhancement of fringes by subtracting two Bessel fringe patterns at different forcing levels. Compared with the phase-shift method, this method is more efficient and easier to implement for qualitative vibration measurement, providing a means for fast inspection of plate vibration behavior. It is also capable of tracing contours of zero strain and locating antinodes on vibrating plates.
Original languageEnglish
Pages (from-to)3776-3784
Number of pages9
JournalApplied Optics
Issue number16
Publication statusPublished - 1 Jun 1997


  • Antinodes
  • Digital shearography
  • Time-averaged speckle pattern shearing interferometry
  • Vibration mode shape
  • Zero-strain distribution

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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