Yang Yang, Zhou Sha, Hao Feng, Zhining Jia, Yang Yang, Guanqun Wang. Signal Processing Method of Φ-OTDR Technology in Early Warning and Leakage Positioning of Water Pipelines[J]. Laser & Optoelectronics Progress, 2018, 55(4): 040607
- Laser & Optoelectronics Progress
- Vol. 55, Issue 4, 040607 (2018)
Fig. 1. Schematic diagram of distributed vibration sensing system based on Φ-OTDR
Fig. 2. Schematic diagram of the pipeline leak positioning and early warning system based on Φ-OTDR
Fig. 3. Original time domain signals at positions (a) 426 and (b) 970
Fig. 4. Power spectra of original time domain signals at positions (a) 429 and (b) 970
Fig. 5. Approximate entropy distributions at positions (a) 429 and (b) 970
Fig. 6. Information entropy distributions at positions (a) 429 and (b) 970
Fig. 7. (a) Spatial frequency energy distribution; (b) spatial frequency energy distribution (in detail)
Fig. 8. High-pass filtered signals at (a) 429 and (b) 970
Fig. 9. Schematic diagram of the vibration location technique based on spatial-frequency energy distribution
Fig. 10. (a) Spatial frequency energy distribution of in-soil knocking; (b) spatial frequency energy distribution of in-soil knocking (in detail)
Fig. 11. (a) Spatial frequency energy distribution of in-water knocking; (b) spatial frequency energy distribution of in-water knocking (in detail)
Fig. 12. (a) Spatial frequency energy distribution of soil-buried water pipe leakage; (b) spatial frequency energy distribution of soil-buried water pipe leakage (in detail)
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Table 1. Test results of knock and leak location
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