14 June 1995 Phase stepping and heterodyning in a fiber-based speckle shearing interferometer
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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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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); doi: 10.1117/12.211863; https://doi.org/10.1117/12.211863
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