Full-field optical strain measurement having postrecording sensitivity and direction selectivity - A coherent optical technique is described which allows for strain determination along any direction and with variable sensitivity using a single photographic recording (shearing-specklegram)

Y. Y. Hung*, I. M. Daniel, R. E. Rowlands

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

An optical method of strain measurement is described which possesses numerous advantages over conventional and holographic interferometry. The method consists of imaging the coherently illuminated object by a lens, and double-exposing a photographic plate in a misfocused image plane before and after deformation of the object. The processed photographic plate or 'specklegram' is subsequently Fourier-filtered to provide fringe patterns representing derivatives of surface displacements with respect to any desired direction and with variable and controllable sensitivity.

Original languageEnglish (US)
Pages (from-to)56-60
Number of pages5
JournalExperimental Mechanics
Volume18
Issue number2
DOIs
StatePublished - Feb 1 1978

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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