Chinese Journal of Lasers, Volume. 49, Issue 19, 1904004(2022)
Research and Application of High-precision Fiber-Optic Rotational Seismometer
Figures & Tables(16)
Fig. 1. Schematics of depolarized SIA. (a) Before inserting phase modulator; (b) after inserting phase modulator
Fig. 3. Measured output spectra of depolarized SIA. (a) Before modulation; (b) after modulation
Fig. 6. Magnetic sensitivity test results of DFOG. (a) Axial magnetic field; (b) radial magnetic field
Fig. 8. Developed prototypes. (a) DD-FORS prototype; (b) packaging boxes; (c) BHFORS-3C
Fig. 9. Scene photographs. (a) Test site in Huainan; (b) test site in Lijiang; (c) test site in Beijing; (d) coupling of BHFORS-3C and foundation pier
Fig. 11. Road-map of fiber optic rotational seismometer development based on giant-FOG[1]
Fig. 12. Time frequency analysis results of seismic rotational components. (a1)(a2) EW; (b1)(b2) NS; (c1)(c2) UD
Table 1. Main simulation parameters
View tableTable 1. Main simulation parameters
Parameter Fiber length /m Birefringence Splice angle /(°) L1 L2 L3 L4 Ls Δn Δns θ12 θ34 θ1s θ2s Value 2.3 9.2 4.6 18.4 3000.0 5×10－4 1×10－6 45 45 40 50
Table 2. Main parameters of single axis DD-FORS
View tableTable 2. Main parameters of single axis DD-FORS
Component Main parameter BS1 Central wavelength of 1314.1 nm and bandwidth of 30.3 nm BS2 Central wavelength of 1542.3 nm and bandwidth of 30.7 nm PD1 and PD2 InGaAs detector, wavelength range of 1100－1650 nm, resistance of 40 kΩ，and efficiency ratio of 0.9 A/W Fiber coil Single mode fiber coil，length of 21 km，and diameter of ～0.4 m
Table 3. List of partial observed seismic events
View tableTable 3. List of partial observed seismic events
No. Time Earthquake magnitude Latitude /(°) Longitude /(°) Distance/km Region 1 2021-06-10T19：46：07 5.1 24.34 101.91 329.85 China 2 2021-06-12T18：00：46 5 24.96 97.89 317.89 China 3 2021-07-29T16：39：27 5.7 22.7 96.04 629.54 Burma 4 2021-09-16T04：33：31 6 29.2 105.34 563.02 China 5 2021-11-26T07：45：42 6.1 22.7 93.4 832.27 Burma 6 2021-12-20T05：06：14 6 19.6 101.4 819.58 Laos 7 2021-12-24T21：43：21 6 22.33 101.69 528.24 Laos 8 2022-01-08T01：45：27 6.9 37.77 101.26 1213.47 China 9 2022-01-15T16：19：48 3 26.99 100.07 19.49 China 10 2022-02-10T15：36：38 4.1 25.56 100.04 149.37 China 11 2022-03-16T22：36：29 7.4 37.65 141.95 4064.00 Japan 12 2022-03-23T01：41：38 6.6 23.45 121.55 2176.51 China 13 2022-04-16T08：32：13 4.6 27.78 100.62 105.89 China
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Shuai Li, Yuanhong Yang, Liangzhen Li, Rumo Wang. Research and Application of High-precision Fiber-Optic Rotational Seismometer[J]. Chinese Journal of Lasers, 2022, 49(19): 1904004
Paper Information
Category: Measurement and metrology
Received: May. 19, 2022
Accepted: Jun. 22, 2022
Published Online: Sep. 20, 2022
The Author Email: Yang Yuanhong (yhyang@buaa.edu.cn)
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