Optical fiber vibration sensor using (Pancharatnam) phase stepinterferometry |
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Authors: | Ferrari JA Frins EM Dultz W |
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Affiliation: | Fac. de Ingenieria, Inst. de Fisica, Montevideo ; |
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Abstract: | A fiber-optic vibration sensor based on polarization and phase-step interferometry is reported. Left- and right-circularly polarized light coming back from the reference and signal arms of a modified Michelson fiber interferometer is processed with an array of five linear analyzers separated angular steps of π/4 (rad) from each other. Thus, five interference patterns are acquired simultaneously and the dynamical phase retrieval problem is reduced to five-step interferometry in the time-domain. A vibration sensor as described above was built by the authors and its performance was investigated |
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