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Real-time shearography for measuring time-dependent displacement derivatives

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Abstract

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.

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References

  1. Hung, Y.Y., “Shearography: A New Optical Method for Strain Measurement and Nondestructive Testing,”Opt. Eng. 21,391 (1982).

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  2. Hung, Y.Y., “Speckle-shearing Interferometer,”Optics Commun.,11,732 (1974).

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  3. Takezaki, J. andHung, Y.Y., “Direct Measurement of Flexural Strains in Plates by Shearography,”J. Appl. Mech.,53,125 (1986).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Oakland University, 48309, Rochester Hills, MI

    Y. Y. Hung (Professor)

  2. Phase Shift Technology, 1430 East Ft. Lowell, 85719, Tucson, AZ

    S. Tang (R&D Engineer)

  3. Oakland University, USA

    J. D. Hovanesian (Professor)

Authors
  1. Y. Y. Hung
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  2. S. Tang
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  3. J. D. Hovanesian
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Hung, Y.Y., Tang, S. & Hovanesian, J.D. Real-time shearography for measuring time-dependent displacement derivatives. Experimental Mechanics 34, 89–92 (1994). https://doi.org/10.1007/BF02328445

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  • DOI: https://doi.org/10.1007/BF02328445

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