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

Jesus D. R. Valera; Julian D. C. Jones; David P. Towers; Clive H. Buckberry

doi:10.1117/12.211863

14 June 1995 Phase stepping and heterodyning in a fiber-based speckle shearing interferometer

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

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211863
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Jesus D. R. Valera, Julian D. C. Jones, David P. Towers, and Clive H. Buckberry "Phase stepping and heterodyning in a fiber-based speckle shearing interferometer", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211863

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