Distributed Fiber-Optic Vibration and Temperature Sensing System

Fig. 2. Experimental results of distributed vibration sensing. (a) Interference signals detected by PD1 and PD2 with vibration event; (b) vibration positions of 500 sets of vibration events

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Fig. 3. Spectrogram of interference signal

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Fig. 4. Temperature curves. (a) Temperature curves at the end of the 10.024 km fiber; (b) temperature curves between 9200 m and 9500 m; (c) temperature curves between 9550 m and 9700 m

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Table 1. Positioning accuracy statistics
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Table 1. Positioning accuracy statistics
Position error /m [-10,10] [-30,-10]∪[10,30] [-50,-30]∪[30,50] (-∞,-50]∪[50,+∞)
Percentage /% 66.2 15.4 9.6 8.8

Table 2. Sensing noise analysis of distributed temperature sensing
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Table 2. Sensing noise analysis of distributed temperature sensing
Position /km Signal-to-noise ratio /dB Root-mean-square error /℃
0-1 27.12 1.3
9-10 22.98 1.8

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Pan Liang, Liu Kun, Jiang Junfeng, Ma Chunyu, Ma Pengfei, Liu Tiegen. Distributed Fiber-Optic Vibration and Temperature Sensing System[J]. Chinese Journal of Lasers, 2018, 45(1): 110002

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