Fiber optic interferometric seismometer with phase feedback control | Zendy

Tianying Chang | Zendy; Zhongmin Wang | Zendy; Yue Yang | Zendy; Yaolu Zhang | Zendy; Zhifeng Zheng | Zendy; Liyao Cheng | Zendy; HongLiang Cui | Zendy

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Fiber optic interferometric seismometer with phase feedback control

Author(s) -

Tianying Chang,

Zhongmin Wang,

Yue Yang,

Yaolu Zhang,

Zhifeng Zheng,

Liyao Cheng,

HongLiang Cui

Publication year - 2020

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.385703

Subject(s) - optics , interferometry , sensitivity (control systems) , michelson interferometer , phase (matter) , optical fiber , vibration , seismometer , noise (video) , phase noise , physics , signal (programming language) , fiber optic sensor , acoustics , computer science , electronic engineering , engineering , civil engineering , quantum mechanics , artificial intelligence , image (mathematics) , programming language

A high-sensitivity ultralow-frequency fiber optic interferometric seismometer using phase feedback control is proposed and demonstrated. The principle of sensitivity improvement using feedback is described, and the characteristics of the seismometer, including the ultralow-frequency vibration sensing with Michelson interferometer with and without feedback control, are analyzed in terms of the amplitude response and phase response. The phase feedback control loop is designed and implemented, and higher sensitivity for very low frequency vibration is achieved. The efficacy of the new approach is demonstrated experimentally, showing that the weak vibration signal originally buried in noise can be observed unambiguously.

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