Infrared and Laser Engineering, Volume. 54, Issue 4, 20250095(2025)
Recent advances of optical fiber vector geophone (invited)
Fig. 2. Amplitude frequency characteristics of geophone. (a) Displacement sensor; (b) Velocity sensor; (c) Accelerometer
Fig. 4. Three component geophone of DAS. (a) Internal structure; (b) Frequency response curve[65]
Fig. 9. Thin clad FBG sensitization method. (a) Sensitization structure diagram; (b) Frequency responses of three geophones[102]
Fig. 10. Tri-axis FBG geophone. (a) Elastic sheets; (b) FBG accelerometer; (c) Schematic; (d) Photo[32]
Fig. 11. 3D FBG geophone. (a) Photo of geophone; (b) Schematic diagram of internal design; (c) Temperature response; (d) Orientation-dependent response[115]
Fig. 15. 3D vector FBG geophone. (a) Model; (b) Elastic structure[121]
Fig. 16. 7-CF vector geophone. (a) Fiber core selection cross-sectional view; (b) Design structure diagram and physical photos[130]
Fig. 17. Cascaded 7-CF vector geophone. (a) Mold of the cylinder; (b) Photograph of the cylinder; (c) Photograph of the geophone; (d) Schematic diagram of cascaded multiplexing[131]
Fig. 18. Orthogonal polarization vector geophone. (a) Micrograph and the cross section of PMF;(b) Sensitivity and orthogonal-polarimetric orientation[133]
Fig. 21. Schematic diagram of series orthogonal cladding FBGs[142]
Fig. 22. Parallel cladding FBGs. (a) Writting device of CWBGs; (b) Microscopic view of fiber cross-section; (c) Microscopic view of the processed waveguide[143]
Fig. 23. Orthogonal cladding FBGs. (a) Schematic diagram; (b) Photomicrograph; (c) Test graph [144]
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Hong GAO, Dakuan YU, Xiaodong LUO, Wei FAN, Huidong LI, Xueguang QIAO. Recent advances of optical fiber vector geophone (invited)[J]. Infrared and Laser Engineering, 2025, 54(4): 20250095
Category: Invited review
Received: Jan. 31, 2025
Accepted: --
Published Online: May. 16, 2025
The Author Email: Xueguang QIAO (xgqiao@nwu.edu.cn)