Design of low frequency fiber optic Fabry-Perot seismometer based on transfer function analysis

• 作者: Huicong Li Wentao Zhang Wenzhu Huang Yanliang Du
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Instrumentation,Measurement,and Optical Sensing
• 页码范围: 31-36
• 页数: 6页
• 语种: 英文
• DOI: 10.3788/COL202119.051201

摘要

We develop a low frequency fiber Fabry-Perot[F-P]seismometer based on transfer function analysis.The seismometer structure and demodulation system accuracy are limitations of low frequency seismic monitoring.The transfer function of the F-P seismometer is analyzed,and the mass displacement spectrum[MDS]is introduced.MDS provides guidance for mechanical structure design and optical interferometer analysis to achieve low noise.The F-P seismometer prototype is built.The experiment shows that the prototype has an average noise of 6.74 ng/√Hz below 50 Hz,and its noise is less than that of the global new high noise model within 0.16-50 Hz,whose potential is considerable.