Gang Gao, Jun Li, Xu’an Liu, Bo Shi, Yuquan Tang, Tao Pang, Qing Zheng, Liming Sun, Fengzhong Dong. Bag Filter Leak Detection and Location Based on Phase-Sensitive Optical Time Domain Reflectometry[J]. Acta Optica Sinica, 2018, 38(7): 0706001
- Acta Optica Sinica
- Vol. 38, Issue 7, 0706001 (2018)
Fig. 1. (a) Schematic of φ-OTDR system; (b) system prototype
Fig. 2. Schematic of back pulse-cleaned bag filters
Fig. 3. Configuration of simulation platform in laboratory
Fig. 4. (a) Superposition of 20 consecutive Rayleigh traces; (b) adjacent time-domain difference of the superposition; (c) positioning accuracy; (d) spatial resolution
Fig. 5. (a) Frequency spectrum at 100 Hz; (b) contour map of 100 Hz frequency response
Fig. 6. Contrast diagram of the frequency response contour of three bags
Fig. 7. (a) Experimental scene; (b) schematic of on-site optical fiber laying
Fig. 8. Amplitude-frequency characteristics of normal bags (1-500) and broken bags (500-1000). (a)(b) Frequency spectra contract at 1561 m location; (c)(d) frequency spectra contract at 1493 m and 1561 m locations
Fig. 9. (a) Visual model of classification at 1561 m location; (b) visual model of classification at 1493 m and 1561 m locations
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Table 1. Classification results of two different kinds of bags at the same place of 1561 m
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Table 2. Classification results of two different kinds of bags at the same time
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