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- W2024890730 abstract "A shearography system that measures the deformation gradient using two orthogonal shear directions and performs phase stepping, using no moving mechanical components and a single CCD camera, is described. The light exiting from a highly linearly birefringent optical fibre is switched between two orthogonal linearly polarized states by tuning the optical wavelength of a laser diode via injection current modulation. A polarization sensitive Michelson interferometer is used to shear the image in orthogonal directions for p- and s-polarized light. The change in the optical wavelength is also used to provide a phase step in the pathlength imbalanced interferometer. In this way wavelength modulation of a laser diode source is used to accomplish simultaneously polarization multiplexing and phase stepping in the shearing interferometer. By carefully matching the optical wavelength shift, the optical fibre length and the pathlength imbalance in the interferometer, the π/2 polarization shift can be matched to the required phase step." @default.
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- W2024890730 date "2000-08-25" @default.
- W2024890730 modified "2023-09-27" @default.
- W2024890730 title "Polarization-multiplexed and phase-stepped fibre optic shearography using laser wavelength modulation" @default.
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- W2024890730 doi "https://doi.org/10.1088/0957-0233/11/9/320" @default.
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