Journal
CHINESE OPTICS LETTERS
Volume 19, Issue 5, Pages -Publisher
OSA-OPTICAL SOC
DOI: 10.3788/COL202119.051201
Keywords
fiber optics; seismometers; frequency
Categories
Funding
- National Key R&D Program of China [2019YFC1509500]
- Shenzhen Science and Technology Program [KQTD20180412181337494]
- National Natural Science Foundation of China (NSFC) [U1939207]
- Scientific Instrument Developing Project of the Chinese Academy of Sciences, Youth Innovation Promotion Association of CAS [2016106]
- Strategic Priority Research Program A of the Chinese Academy of Sciences [XDA22010201]
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A low frequency fiber Fabry-Perot seismometer was developed based on transfer function analysis, with experimental results showing its noise level below 50 Hz is lower than that of the global new high noise model.
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/pHz 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.
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