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Fiber optic interferometric seismometer with phase feedback control
Chang, Tianying1,2; Wang, Zhongmin1; Yang, Yue1; Zhang, Yaolu1; Zheng, Zhifeng3; Cheng, Liyao3; Cui, Hong-Liang1,4
2020-03-02
摘要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. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
DOI10.1364/OE.385703
发表期刊OPTICS EXPRESS
ISSN1094-4087
卷号28期号:5页码:6102-6122
通讯作者Cui, Hong-Liang(hcui@jlu.edu.cn)
收录类别SCI
WOS记录号WOS:000518435600018
语种英语