Yiping Wang, Huajian Zhong, Rongyi Shan, Wenfa Liang, Zhenwei Peng, Yanjie Meng, Changrui Liao, Cailing Fu. Distributed Fiber Optic Sensing Based on Optical Frequency Domain Reflectometry and Its Application Progress (Invited)[J]. Laser & Optoelectronics Progress, 2024, 61(1): 0106002
- Laser & Optoelectronics Progress
- Vol. 61, Issue 1, 0106002 (2024)
Fig. 1. Configuration of optical frequency domain reflectometry
Fig. 2. The beat principle of optical frequency domain reflectometry. (a) Linear sweep frequency of local and probe signals; (b) corresponding beat signals at each delay
Fig. 3. Flow chart of wavelength demodulation method
Fig. 4. Flow chart of phase demodulation method
Fig. 5. The influence of sweep nonlinear noise. (a) Nonlinear sweep curve; (b) frequency of beat signal
Fig. 6. Classification of methods for suppressing noise of sweep nonlinearity
Fig. 7. Configuration of external clock sampling method
Fig. 8. Simplified optical frequency domain reflectometry based on single interferometer[39]
Fig. 9. Sensing results of optical frequency domain reflectometry based on single interferometer[39]. (a) Measured 100 m distance domain signal; (b) cross correlation coefficient within 170 m range
Fig. 10. Principle of external modulation optical sweeping
Fig. 11. Ultra-linear sweep light[49]. (a) Sweep frequency spectrum; (b) instantaneous optical frequency
Fig. 12. Measured 2 km distance domain signal[49]
Fig. 13. Coherent fading phenomenon. (a) Distance domain signal; (b) enlarged view
Fig. 14. Smoothing and filtering of phase
Fig. 15. Principle of pulse internal frequency division
Fig. 16. Fabrication of weak scattering point array using femtosecond laser[65]. (a) Processing schematic diagram; (b) distance domain signal of weak scattering point array
Fig. 17. Phase distribution of single-mode fiber segment and fiber segment with weak scattered point array demodulated by phase method[65]
Fig. 18. Fabrication of weak scattering point array using femtosecond laser in multi-core parallel connection for 3D shape sensing[84]. (a) Distance domain signal of scattering points; (b) 3D shape reconstruction results
Fig. 19. Fiber optic 3D shape sensing instrument
Fig. 20. Schematic diagrams of spectral spatial position mismatch[16]. (a) Spectral position without strain; (b) spectral position at large strain
Fig. 21. Large strain sensing results obtained using different optical fibers. (a) Scattering enhanced fiber[16]; (b) weak reflection point array fiber[65]
Fig. 22. High temperature sensing result[37]
Fig. 23. High temperature sensing results obtained using different post-processing fibers[107]. (a) Weak grating array fiber; (b) weak micro-cavity array[108]
Fig. 24. Large bending fiber
Fig. 25. Fiber corroded by hydrofluoric acid[119]
Fig. 26. Corroded multi-core optical fiber
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