Detection of Acoustic Wave Direction Using Weak-Reflection Fiber Bragg Gratings

Peng Ding; Jing Wu; De Kang; Junbin Huang; Wen Liu; Hongcan Gu; Yunyun Wang; Jinsong Tang

doi:10.3788/CJL202047.0506002

Chinese Journal of Lasers, Volume. 47, Issue 5, 0506002(2020)

Detection of Acoustic Wave Direction Using Weak-Reflection Fiber Bragg Gratings

Peng Ding^1,2, Jing Wu³, De Kang⁴, Junbin Huang^2、*, Wen Liu², Hongcan Gu², Yunyun Wang², and Jinsong Tang¹

Author Affiliations

¹College of Electronic Engineering, Naval University of Engineering, Wuhan, Hubei 430033, China

²Department of Weapon Engineering, Naval University of Engineering, Wuhan, Hubei 430033, China

³Department of Operational Research and Programming, Naval University of Engineering, Wuhan, Hubei 430033, China

⁴Equipment Support Branch of Naval Equipment Department, Beijing 100036, China

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Figures & Tables(10)

Fig. 1. Schematic of distributed sensor system based on WFBG

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Fig. 2. Simulation signals of two sensing fibers. (a) Time domain signals; (b) amplitude-frequency curves

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Fig. 3. Sensitivity test of sensing optical fiber

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Fig. 4. Sensitivity test results of the sensing optical fiber. (a) Data collected by acquisition card; (b) extracted interference peak signals; (c) demodulated phase signals under multiple measurements

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Fig. 5. Setting of distributed sensing fibers and acoustic source. (a) Sensors; (b) acoustic sources

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Fig. 6. Signals demodulated by optical fiber sensing system. (a) Output signals of acquisition card; (b) signal peaks extracted from No.1 sensor

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Fig. 7. Signals decumulated by the two sensors with loudspeakers at different positions. (a) Point A; (b) point B; (c) point C; (d) point D; (e) point E

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Table 1. Sine wave fitting results of the demodulated signals

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Table 1. Sine wave fitting results of the demodulated signals

Testing time	Fitting function	R-square	Frequency /Hz	Amplitude /rad
1	1.36sin(2.01x+1.3040)	0.75512	320	1.36
2	0.72sin(2.03x+2.5830)	0.72716	323	0.72
3	0.36sin(2.08x+0.8935)	0.70194	331	0.36
4	1.06sin(1.85x+1.4890)	0.84306	294	1.06
5	0.84sin(2.03x+2.8740)	0.85573	323	0.84
6	0.92sin(1.93x+2.8485)	0.74807	307	0.92
7	0.61sin(1.98x+0.79)	0.77599	315	0.61

Table 2. Calculation values of θ₀ for loudspeakers at different locations
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Table 2. Calculation values of θ₀ for loudspeakers at different locations
Position A B C D E
θ₀ /(°) 25.453 13.282 0 -13.282 -25.453

Table 3. Sine wave fitting results of the demodulation signals

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Table 3. Sine wave fitting results of the demodulation signals

Point	Sensor	Fitting function	R-square	Frequency /Hz	Δφ_signal /rad	θ₀ /(°)
A	No.1	3.087sin(1.836x+1.3040)	0.8172	292
	No.2	3.7778sin(1.916x+2.5830)	0.8943	305	1.2790	24.04
B	No.1	3.001sin(2.248x+0.8935)	0.8919	357
	No.2	6.285sin(2.025x+1.4890)	0.9684	322	0.5955	10.93
C	No.1	1.744sin(2.023x+2.8740)	0.9021	322
	No.2	5.951sin(1.992x+2.8485)	0.9837	317	-0.0255	-0.47
D	No.1	4.027sin(2.074x+0.79)	0.9817	330
	No.2	8.726sin(2.025x+0.01625)	0.9961	322	-0.7738	-14.27
E	No.1	2.123sin(2.181x+0.5101)	0.9540	347
	No.2	2.63sin(2.119x-0.8686)	0.9645	337	-1.3787	-26.04

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Peng Ding, Jing Wu, De Kang, Junbin Huang, Wen Liu, Hongcan Gu, Yunyun Wang, Jinsong Tang. Detection of Acoustic Wave Direction Using Weak-Reflection Fiber Bragg Gratings[J]. Chinese Journal of Lasers, 2020, 47(5): 0506002

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