Peng Ding, Junbin Huang, Gaofei Yao, Hongcan Gu, Wen Liu, Jinsong Tang. Weak Reflection Fiber Bragg Grating Hydrophone with Secondary Coating Sensitization[J]. Chinese Journal of Lasers, 2021, 48(9): 0906003
- Chinese Journal of Lasers
- Vol. 48, Issue 9, 0906003 (2021)
Fig. 1. Profile of WFBG hydrophone
Fig. 2. Relationship between Msignal and R3, E3, ν3. (a) Between Msignal and R3; (b) between Msignal and E3; (c) between Msignal and ν3
Fig. 3. Relationship between R3 and Msignal
Fig. 4. Phase-sound pressure sensitivity testing system of WFBG hydrophone. (a) System; (b) vibrating liquid column; (c) coating fiber
Fig. 5. Frequency response characteristics of the high density polyethylene fiber ring. (a) Displacement of the ring; (b) acceleration response of No.18901 node
Fig. 6. 5 Hz signal of bare WFBG array. (a) Time domain signal; (b) frequency domain signal
Fig. 7. 7.5 Hz signal of bare WFBG array. (a) Time domain signal; (b) frequency domain signal
Fig. 8. 10 Hz signal of bare WFBG array. (a) Time domain signal; (b) frequency domain signal
Fig. 9. 5 Hz signal of high density polyethylene coated WFBG hydrophone with 0.4 mm diameter. (a) Time domain signal; (b) frequency domain signal
Fig. 10. 7.5 Hz signal of high density polyethylene coated WFBG hydrophone with 0.4 mm diameter. (a) Time domain signal; (b) frequency domain signal
Fig. 11. 10 Hz signal of high density polyethylene coated WFBG hydrophone with 0.4 mm diameter. (a) Time domain signal; (b) frequency domain signal
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Table 1. Properties and expected sensitization effects of four kinds of materials
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Table 2. Phase-sound pressure sensitivity of uncoated WFBG array and coated WFBG hydrophone unit: dB
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