Strain and Vibration Analysis by Fibre Based Speckle Shearing Interferometry

J. D R Valera, J. D C Jones, D. P. Towers, C. H. Buckberry

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


An optical fibre based, speckle shearing interferometer is described. The instrument uses a highly birefringent optical fibre to illuminate a test object with equal intensities of light guided by the orthogonal polarisation eigenstates of the fibre. A Wollaston prism is used to obtain two sheared images with adjustable shear. Optical phase changes between the sheared images are readily achieved, without mechanical movement of components, by straining the optical fibre. Object strain determination, by fringe analysis with phase stepping techniques, is readily achieved. Vibration analysis by heterodyning is also reported. Copyright © 1996 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)361-375
Number of pages15
JournalOptics and Lasers in Engineering
Issue number4-5 SPEC. ISS.
Publication statusPublished - Mar 1997


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