Man-ling TIAN, Dong-hui LIU, Xiao-min CAO, Kuang-lu YU. Signal processing methods of phase sensitive optical time domain reflectometer:a review[J]. Optics and Precision Engineering, 2021, 29(9): 2189

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- Optics and Precision Engineering
- Vol. 29, Issue 9, 2189 (2021)

Fig. 1. Ф-OTDR system

Fig. 2. Schematic diagram of wavelet decomposition (solid line) and wavelet packet decomposition (solid line plus dashed line)

Fig. 3. Threshold function in wavelet denoising

Fig. 4. EMD decomposition (I M F L ![]()
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: the signal after the decomposition of the L layer; r e s L ![]()
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: the residual component after the decomposition of the Lth layer)

Fig. 5. Signal reconstruction process

Fig. 6. ANN network structure with single hidden layers

Fig. 7. SVM structure

Fig. 8. Combination of multiple classifiers

Fig. 9. CNN-based Ф-OTDR data processing scheme

Fig. 10. LSTM-based Ф-OTDR data processing scheme
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Table 1. Literature summary of feature extraction methods
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Table 2. Common time domain characteristics table
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Table 3. Classification algorithm performance comparison

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