Chinese Optics Letters, Volume. 19, Issue 3, 030601(2021)
Classification of interference-fading tolerant Φ-OTDR signal using optimal peak-seeking and machine learning [Invited]
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Fig. 2. (a) Probability of signal falling into the dead zone under different window size (100 ns). (b) Probability of signal falling into the dead zone under different pulse width.
Fig. 3. (a) Ada-5032E. (b) Schematic diagram of the experiment. (NLL, narrow-linewidth laser; AOM, acoustic-optical modulator; FUT, fiber under test; EDFA, erbium-doped fiber amplifier; Cir, circulator; BPD, balanced photodetector; DAQ, data acquisition card; PZT, piezo transducer.)
Fig. 4. STFT spectrum of phase results in 15 s. (a) Traditional method. (b) Proposed method.
Fig. 6. STFT spectrum of 10 ramming ground tests. (a) Traditional method. (b) Proposed method.
Fig. 7. (a) Excavator digging event. (b) Time domain wave pattern of an invasive event. (c) Frequency-domain image after STFT. (d) Binary image after threshold filtering.
Fig. 8. (a) Parameter optimization results of SVM model. (b) Schematic structure of feedforward neural network. (c) Mean squared error.
Table 1. Definition of Pattern Features
View tableView in ArticleTable 1. Definition of Pattern Features
Feature Symbol Description Area S Total number of pixels Perimeter P Number of pixels on edge Compactness Con (Square of P)/S Number of clusters Nc Number of connected pixel clusters
Table 2. Category and Counts of Samples and Labels
View tableView in ArticleTable 2. Category and Counts of Samples and Labels
Event Category Number of Samples Label Excavator digging 93 1 Engineering truck passing 148 2 Falling rock 53 3 Pile driver hitting 37 4 Directional drilling 52 5
Table 3. Testing Dataset and Results of Both Models
View tableView in ArticleTable 3. Testing Dataset and Results of Both Models
Event Number of Samples Accuracy (%) SVM FNN Excavator digging 24 100 100 Truck passing 41 100 100 Rock falling 13 100 100 Stick ramming 9 67 78 Driller punching 13 100 100
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Yixin Zhang, Tong Zhou, Zhewen Ding, Yanqing Lu, Xuping Zhang, Feng Wang, Ningmu Zou, "Classification of interference-fading tolerant Φ-OTDR signal using optimal peak-seeking and machine learning [Invited]," Chin. Opt. Lett. 19, 030601 (2021)
Paper Information
Category: Fiber Optics and Optical Communications
Received: Oct. 23, 2020
Accepted: Jan. 19, 2021
Published Online: Mar. 11, 2021
The Author Email: Xuping Zhang (xpzhang@nju.edu.cn), Ningmu Zou (nz86@cornell.edu)
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