Contrast and sensitivity of the vibration fringes in time-averaged electronic speckle-pattern interferometry: Effect of variations of force level

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


The time averaged frame subtraction technique is improved by subtracting two Bessel fringe patterns at two different force levels. The technique enables significant enhancement of fringe contrast and increased measurement sensitivity. The contrast and sensitivity of the fringes obtained at different force ratios are investigated. Both theoretical and experimental results are presented.
Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalOptics and Laser Technology
Issue number4
Publication statusPublished - 1 Jan 1997


  • Electronic speckle pattern interferometry
  • Mode shape
  • Vibration analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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