Phase stepping and heterodyning in a fiber-based speckle shearing interferometer

Jesus D. Valera, Julian D. Jones, David P. Towers, Clive H. Buckberry

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


An optical, fiber-based, speckle shearing interferometer is described. The instrument uses a highly birefringent optical fiber to illuminate a test object with equal intensities of light guided by the orthogonal polarization eigenstates of the fiber. 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 fiber. Object strain determination, by fringe analysis with phase stepping techniques, is readily achieved. Vibration analysis by heterodyning is also reported.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Number of pages9
Publication statusPublished - 1995
EventInterferometry VII: Techniques and Analysis - San Diego, CA, USA
Duration: 11 Jul 199512 Jul 1995


ConferenceInterferometry VII: Techniques and Analysis
CitySan Diego, CA, USA


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