1. Real-time displacement reconstruction based on all-fiber Fabry–Perot interferometer.
- Author
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Zhao, Cun, Dong, Taiji, Gao, Bingkun, and Li, Dexin
- Subjects
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FABRY-Perot interferometers , *DISPLACEMENT (Mechanics) , *HARBORS , *DEMODULATION , *ELECTRONIC data processing , *PHOTODETECTORS , *FIBERS - Abstract
• A real-time displacement measurement technique based on all-fiber Fabry–Perot interferometer. • The quadrature detection algorithm can significantly simplify the data processing process. • Two Fabry-Perot interference signals with a phase shift of π / 2 can be obtained directly. • The object displacement can be reconstructed directly by the quadrature demodulation algorithm. • The structure of the system is simple and compact. A real-time displacement reconstruction method based on an all-fiber Fabry–Perot interferometer (FPI) is proposed, utilizing the fiber end face and the object surface to form an extrinsic FPI. Using the constant phase difference of 90° between the two output ports of the 2 × 2 coupler, two-phase orthogonal FPI signals carrying the object motion information can be detected by two invisible photodetectors, and real-time displacement reconstruction can be realized by adopting inverse tangent and unwrapping processing procedures. Results show that the absolute errors of the experiment are below 80 nm. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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