Zuyuan He, Qingwen Liu. Principles and Applications of Optical Fiber Distributed Acoustic Sensors[J]. Laser & Optoelectronics Progress, 2021, 58(13): 1306001
- Laser & Optoelectronics Progress
- Vol. 58, Issue 13, 1306001 (2021)
Fig. 1. The typical OTDR configuration
Fig. 2. The typical COTDR configuration
Fig. 3. OFDR configuration
Fig. 4. Locating principle of OFDR system
Fig. 5. TGD-OFDR configuration
Fig. 6. Principle of vibration measurement via RBS phase method
Fig. 7. The DAS demodulation scheme based on unbalanced Mach-Zehnder interferometer. (a) Phase demodulation using 3×3 coupler[30]; (b) phase demodulation using phase-generated carrier technology[31]
Fig. 8. Suppression of coherence fading. (a) Dual probe pulses with π-phase shift[47]; (b) inner-pulse frequency-division in TGD-OFDR[47]; (c)‒(e) schematic of rotated-vector-sum method[41]
Fig. 9. Principle of frequency demodulated method in DAS
Fig. 10. Distributed sensing using Rayleigh frequency pattern and the cross correlation algorithm[53]
Fig. 11. Demodulation using RBS curve matching[58]
Fig. 12. Longitudinal shift of the RBS trace when temperature changes are applied to the fiber[60]
Fig. 13. Chirped pulse and short-time Fourier transform of corresponding pulse[62]
Fig. 14. Walk-away VSP images from conventional geophone data and DAS[65]
Fig. 15. Standard architecture of a DAS and pattern recognition system[68]
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