Experimental Mechanics

, Volume 34, Issue 1, pp 89–92 | Cite as

Real-time shearography for measuring time-dependent displacement derivatives

  • Y. Y. Hung
  • S. Tang
  • J. D. Hovanesian


Shearography is an interferometric method for the direct measurement of derivatives of surface displacement. Shearography is traditionally practiced with a double-exposure mode. This paper presents a realtime technique which allows the derivative of surface displacement of the test object to be continuously observed. This technique is useful for monitoring time-dependent or transient deformation.


Mechanical Engineer Fluid Dynamics Direct Measurement Test Object Surface Displacement 
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  1. 1.
    Hung, Y.Y., “Shearography: A New Optical Method for Strain Measurement and Nondestructive Testing,”Opt. Eng. 21,391 (1982).Google Scholar
  2. 2.
    Hung, Y.Y., “Speckle-shearing Interferometer,”Optics Commun.,11,732 (1974).CrossRefMathSciNetGoogle Scholar
  3. 3.
    Takezaki, J. andHung, Y.Y., “Direct Measurement of Flexural Strains in Plates by Shearography,”J. Appl. Mech.,53,125 (1986).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1994

Authors and Affiliations

  • Y. Y. Hung
    • 1
  • S. Tang
    • 2
  • J. D. Hovanesian
    • 3
  1. 1.Department of Mechanical EngineeringOakland UniversityRochester Hills
  2. 2.Phase Shift TechnologyTucson
  3. 3.Oakland UniversityUSA

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