Haoyu Ma, Xiaxiao Wang, Fu Ma, Jia Yu. Research Progress of Φ-OTDR Distributed Optical Fiber Acoustic Sensor[J]. Laser & Optoelectronics Progress, 2020, 57(13): 130005
- Laser & Optoelectronics Progress
- Vol. 57, Issue 13, 130005 (2020)
![Basic structure of Φ-OTDR[4]](/Images/highlights-null.jpg)
Fig. 1. Basic structure of Φ-OTDR[4]
Fig. 2. Direct detection block diagram[8]
![First Φ-OTDR system block diagram based on direct detection[9]](/Images/icon/loading.gif){kind=icon}
Fig. 3. First Φ-OTDR system block diagram based on direct detection[9]
Fig. 4. Φ-OTDR optical fiber distributed sensing system based on high power ultra-narrow linewidth single mode fiber laser[12]
Fig. 5. Direct detection structure based on Michelson interferometer[16]
Fig. 6. Direct detection structure based on 3×3 Michelson interferometer[17]
Fig. 7. Heterodyne detection block diagram[8]
Fig. 8. Distributed disturbance sensing system with super long monitoring distance[28]
Fig. 9. Sensing system structure combined with unbalanced 3×3 coupler[30]
Fig. 10. Discharge positioning system[34]
Fig. 11. PGC-DCM algorithm block diagram
Fig. 12. PGC-Arctan algorithm block diagram
Fig. 13. PGC-RCM algorithm block diagram[42]
Fig. 14. Block diagram of PGC demodulation algorithm based on asymmetric processing
Fig. 15. 3×3 coupler method block diagram[44]
Fig. 16. Digital IQ demodulation algorithm block diagram
Fig. 17. Schematic diagram of 90° optical mixing[50]
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Table 1. Development of direct detection structures
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Table 2. Development of heterodyne detection structure
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Table 3. Development of phase demodulation algorithms
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