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Updated: Aug 11, 2026
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Development of a parallel demodulation system used for extrinsic Fabry-Perot interferometer and fiber Bragg grating
Junfeng Jiang1, Tiegen Liu, Yimo Zhang
1College of Precision Instrument and Opto-Electronics Engineering and the Key Laboratory of Opto-Electronics Information and Technical Science, Tianjin University, Ministry of Education, China. jiangifjxu@hotmail.com
Abstract:
A parallel demodulation system for extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) sensors is presented, which is based on a Michelson interferometer and combines the methods of low-coherence interference and a Fourier-transform spectrum. The parallel demodulation theory is modeled with Fourier-transform spectrum technology, and a signal separation method with an EFPI and FBG is proposed. The design of an optical path difference scanning and sampling method without a reference light is described. Experiments show that the parallel demodulation system has good spectrum demodulation and low-coherence interference demodulation performance. It can realize simultaneous strain and temperature measurements while keeping the whole system configuration less complex.
