Chinese Optics Letters, Volume. 21, Issue 4, 040601(2023)
Comparative analysis of temporal-spatial and time-frequency features for pattern recognition of φ-OTDR
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Fig. 1. Experimental setup of φ-OTDR. (a) Knocking with a hammer; (b) wind blowing. AOM, acoustic-optic modulator; EDFA, erbium-doped fiber amplifier; LO, local oscillator; BPD, balanced photodetector; DAQ, data acquisition card.
Fig. 2. (a) Developed prototype φ-OTDR instrument; (b) deployed fiber in the experiment.
Fig. 4. Time-domain waveform of vibration signal. (a) Knock around the fiber with a hammer; (b) wind blowing; (c) background noise.
Fig. 5. Temporal-spatial image and time-frequency image for vibration events. (a), (d) Knock around the fiber with a hammer; (b), (e) wind blowing; (c), (f) background noise.
Fig. 8. (a) Classification accuracy curve and (b) loss curve of training.
Fig. 9. Confusion matrix of (a) temporal-spatial image and (b) time-frequency image.
Table 1. Composition of the Data Set
View tableView in ArticleTable 1. Composition of the Data Set
Event Type Knocking Blowing Noise Temporal-spatial training set 599 804 888 Temporal-spatial validation set 421 396 312 Total 1020 1200 1200 Time-frequency training set 845 804 641 Time-frequency validation set 355 396 379 Total 1200 1200 1020
Table 2. Comparison of Training Results between Temporal-Spatial and Time-Frequency Images
View tableView in ArticleTable 2. Comparison of Training Results between Temporal-Spatial and Time-Frequency Images
Precision Accuracy Average Training Time/s Knocking Noise Blowing Temporal-spatial image 99.64% 98.98% 99.98% 99.49% 219 Time-frequency image 95.51% 99.18% 98.19% 98.23% 216
Table 3. Comparison of Recall and f1-Score
View tableView in ArticleTable 3. Comparison of Recall and f1-Score
Event Type Recall f1-Score Temporal-spatial Knocking 99.76% 99.76% Noise 99.36% 99.52% Blowing 99.75% 99.62% Time-frequency Knocking 99.15% 97.50% Noise 96.04% 97.59% Blowing 100% 100%
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Fanran Meng, Wenxiang Zhang, Xiaojun Liu, Fei Liu, Xian Zhou. Comparative analysis of temporal-spatial and time-frequency features for pattern recognition of φ-OTDR[J]. Chinese Optics Letters, 2023, 21(4): 040601
Paper Information
Category: Fiber Optics and Optical Communications
Received: Nov. 1, 2022
Accepted: Jan. 6, 2023
Published Online: Mar. 10, 2023
The Author Email: Fei Liu (lfei20@ustb.edu.cn)
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