Strain and vibration analysis by fibre based speckle shearing interferometry

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 im...

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Bibliographic Details
Published in:Optics and lasers in engineering 1997-01, Vol.26 (4), p.361-376
Main Authors: Valera, J.D.R., Jones, J.D.C., Towers, D.P., Buckberry, C.H.
Format: Article
Language:English
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Summary: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.
ISSN:0143-8166
1873-0302
DOI:10.1016/0143-8166(95)00144-1