Qihao Hu, Xiaoqian Zhu, Lina Ma, Yue Qi, Fan Shang, Yujie Bian. Advances in Passive-Interferometric Type Fiber Bragg Grating-Based Hydrophones[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106015
- Laser & Optoelectronics Progress
- Vol. 60, Issue 11, 1106015 (2023)
![Experimental setup for typical single fiber grating interferometric sensing[7]](/richHtml/lop/2023/60/11/1106015/img_01.jpg)
Fig. 1. Experimental setup for typical single fiber grating interferometric sensing[7]
![Compensated FBG based sensing system[11]](/richHtml/lop/2023/60/11/1106015/img_02.jpg)
Fig. 2. Compensated FBG based sensing system[11]
Fig. 3. Three common types of FBG-FPI. (a) Pre-placed; (b) mid-placed; (c) post-placed
Fig. 4. FBG-FPI based sensing system using broadband light source[21-23]. (a) MZI based demodulation; (b) MI based demodulation
Fig. 5. Time division multiplexing system for matched interferometric FBG-FPI sensor[25]
Fig. 6. Interferometric FBG based hydrophone sensing system proposed by OptoPlan[34]
Fig. 7. Two types of FBG array based sensing system. (a) Balanced MI sensing system[37]; (b) imbalanced MI sensing system[39]
Fig. 8. FBG-FPI hydrophone array[40]. (a) Partial hydrophone array with 20 mm diameter; (b) picture of 32-element FBG towed hydrophone array
Fig. 9. Heterodyne signal demodulation calculation process
Fig. 10. Several FBG hydrophone probe structures. (a) Piston type[7]; (b) side pressure type[20]; (c) end surface stretch sensitization type[20]
Fig. 11. FBG-FPI hydrophone probe for differential detection[46]. (a) Schematic diagram; (b) physical map
Fig. 12. Diagram of FBG based accelerometer reported by NRL[9]. (a) Elastomeric structure; (b) elastic beam structure
Fig. 13. FBG based accelerometer designed by Mita et al[49]. (a) Diagram; (b) physical map
Fig. 14. Vector sensing base station produced by OptoPlan[32]. (a) Fiber optic sensor configuration within a sensing base station; (b) physical sensing base station package
Fig. 15. FBG-FPI based thin-shell cylinder structure 1-D accelerator[55]. (a) Diagram; (b) physical map
Fig. 17. Fiber optic underwater sensor array[62]. (a) Schematic diagram of sensing system; (b) measurement platform
Fig. 18. Principle of crosstalk in FBG-FPI based sensing system[66]
Fig. 19. Diversity reception of polarization in FBG-FPI based hydrophone
Fig. 20. Polarization switch-PGC hybrid modulation and demodulation technique[82]. (a) Schematic diagram of experimental system; (b) pulse timing signal polarization modulation
Fig. 21. Demodulation results of four polarization states[74]. (a) Fading factor; (b) demodulation phase
Fig. 22. Optical configuration within a fiber optic vector sensor station
Fig. 23. Schematic diagram of active coherence modulation and frequency shift modulation technology principles[35]
Fig. 24. Demodulated noise spectra[35]
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