title: Development of a parallel demodulation system used for extrinsic Fabry-Perot interferometer and fiber Bragg grating sensors.
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.
authors.affiliation: College 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
authors.forename: Junfeng
authors.initials: J
authors.lastname: Jiang
authors.forename: Tiegen
authors.initials: T
authors.lastname: Liu
authors.forename: Yimo
authors.initials: Y
authors.lastname: Zhang
authors.forename: Lina
authors.initials: L
authors.lastname: Liu
authors.forename: Ying
authors.initials: Y
authors.lastname: Zha
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Yunxin
authors.initials: Y
authors.lastname: Wang
authors.forename: Pin
authors.initials: P
authors.lastname: Long