Phase retrieval in optical fiber modal interference for structural health monitoring |
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| Authors: | S.K. Ghorai Soumya Sidhishwari |
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| Affiliation: | a Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi 835215, Jharkhand, India
b Department of Applied Physics, Birla Institute of Technology, Mesra, Ranchi 835215, Jharkhand, India |
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| Abstract: | A method based on data dependent system (DDS) for extraction of phase in fiber modal interference is presented. The interference patterns of LP01 & LP11, LP01 & LP02 and LP06 &LP07 within the fiber have been recorded under different launching conditions. The patterns were characterized by means of autoregressive model and the self coherence functions of the corresponding interferogram were determined. It would provide the phase distribution of the pattern and the modulation of group delay due to the measurand. An application has been made for measuring strain in a simply supported beam under different loading conditions. Results are presented for the applied strain in the range of 270-1500 μ strain. |
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| Keywords: | Phase retrieval Data dependent system Modal interference Strain sensor |
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