Characteristics of Soil Vibration Propagation Based on Phase Sensitive Optical Time Domain Reflectometers

Ming Wang; Hao Feng; Zhou Sha; Lipu Du

doi:10.3788/LOP221585

Laser & Optoelectronics Progress, Volume. 60, Issue 19, 1906003(2023)

Characteristics of Soil Vibration Propagation Based on Phase Sensitive Optical Time Domain Reflectometers

Ming Wang¹, Hao Feng¹, Zhou Sha^1、*, and Lipu Du²

¹State Key Laboratory of Precision Measuring Technology and Instruments, School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China

²Ningxia Hui Autonomous Region Water Conservancy Engineering Construction Center, Yinchuan 750004, Ningxia, China

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Figures & Tables(17)

Fig. 1. Schematic diagram of φ-OTDR system

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Fig. 2. Schematic diagram of internal structure of φ-OTDR integrated system

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Fig. 3. Experimental site. (a) Experimental optical path; (b) position of sensing optical cable and experiment; (c) edge auxiliary positioning mark; (d) optical fiber; (e) internal structure of GYTA53 optical cable; (f) internal structure of GJA optical cable

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Fig. 4. Comparison of response signals under action of vibration signals

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Fig. 5. Variation of sensitivity with sensing distance. (a) Humidity 1; (b) humidity 2; (c) humidity 3; (d) humidity 4; (e) humidity 5

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Fig. 6. Sensitivity comparison among different humidities. (a) Ball-0.8 m; (b) ball-0.3 m; (c) shovel; (d) motor

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Fig. 7. Curves of response signal of GYTA53. (a) Time domain-static state; (b) frequency domain-static state; (c) time domain-impact state; (d) frequency domain-impact state

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Fig. 8. Energy distribution of each frequency band under two states. (a) Ball-0.8 m; (b) ball-0.3 m; (c) shovel; (d) motor

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Fig. 9. Distribution graphs of $s_{70 / 40}$ and $s_{70 / 20}$ under two states. (a) $s_{70 / 40}$ ; (b) $s_{70 / 20}$

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Fig. 10. Parameter distributions of two states. (a) $r_{20 - 40}$ ; (b) $r_{40 - 60}$ ; (c) $r_{70 - 90}$ ; (d) $s_{70 / 40}$ ; (e) $s_{70 / 20}$

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Fig. 11. Changes of parameters of continuous signal. (a) $r$ ; (b) $s$ ; (c) corresponding time-domain curve

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Fig. 12. Values of $T_{1}$ and $T_{2}$ under different working conditions

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Fig. 13. Example of suspected vibration point signal. (a) Vibration point signal; (b), (c), (d) non-vibration point signals

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Table 1. Water content and density of different soil environments
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Table 1. Water content and density of different soil environments
Soil environment Humidity 1 Humidity 2 Humidity 3 Humidity 4 Humidity 5
Water content /% 0.05 5.60 9.45 16.42 20.68
Density /（g·cm^-3） 2.42 2.48 2.52 2.57 2.64

Table 2. Judgment results of two methods at a distance of 1 m under dry soil conditions

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Table 2. Judgment results of two methods at a distance of 1 m under dry soil conditions

Data number	Actual record	Time domain	Frequency domain	Data number	Actual record	Time domain	Frequency domain
1	0	0	0	16	1	1	1
2	0	0	0	17	0	0	0
3	1	1	0	18	0	0	0
4	0	1	0	19	1	1	0
5	1	1	1	20	0	1	0
6	0	1	0	21	0	0	0
7	0	0	0	22	1	1	1
8	1	1	1	23	0	1	0
9	0	0	0	24	0	0	0
10	0	0	0	25	0	0	0
11	1	0	1	26	1	1	1
12	0	0	0	27	0	0	0
13	0	0	0	28	0	0	0
14	1	1	1	29	1	1	1
15	0	1	0	30	0	0	0

Table 3. Summary of experimental results in Table 2
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Table 3. Summary of experimental results in Table 2
Time domain-correct rate Time domain-error rate Frequency domain-correct rate Frequency domain-error rate
80% 20% 93.30% 6.67%

Table 4. Comparison of judgment results under various working conditions

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Table 4. Comparison of judgment results under various working conditions

Working condition	Record times	Time domain	Frequency domain	Working condition	Record times	Time domain	Frequency domain
1	10	12	10	9	20	24	20
2	12	14	12	10	20	22	20
3	12	13	12	11	20	25	20
4	12	10	11	12	20	26	20
5	12	12	12	13	20	20	20
6	14	18	14	14	20	23	21
7	20	23	20	15	20	24	20
8	20	18	20	16	20	22	20

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Ming Wang, Hao Feng, Zhou Sha, Lipu Du. Characteristics of Soil Vibration Propagation Based on Phase Sensitive Optical Time Domain Reflectometers[J]. Laser & Optoelectronics Progress, 2023, 60(19): 1906003

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