Peng DING, Junbin HUANG, Yandong PANG, Ciming ZHOU, Hongcan GU, Jinsong TANG. A Towed Line Array with Weak Fiber Bragg Grating Hydrophones[J]. Acta Photonica Sinica, 2021, 50(7): 46
- Acta Photonica Sinica
- Vol. 50, Issue 7, 46 (2021)
Fig. 1. Schematic diagram of laser pulse transmission in WFBG array
Fig. 2. Δφ 1 signals received by 1th fiber with sounds waves in different directions under L =λ sound/2
Fig. 3. Δφ 1 signals received by 1th fiber with sounds waves with high frequencies under θ 0=π/3，L =50m
Fig. 4. Δφ 1 signals received by 1th fiber with sounds waves with low frequencies under θ 0=π/3，L =50m
Fig. 5. Schematic diagram of WFBG hydrophone towed linear array
Fig. 6. Picture of secondary coating worksite of WFBG array
Fig. 7. 309-WFBG array coated with liquid crystal resin with 0.9 mm diameter
Fig. 8. Time domain reflected light intensity of WFBG arrays
Fig. 9. Reflected spectra of uncoated and coated WFBGs
Fig. 10. Picture of the worksite with optical cable for loose tube central bundle type with secondary coating of high density polyethylene
Fig. 11. Optical cable for loose tube central bundle type with secondary coating of high density polyethylene
Fig. 12. Phase-sound pressure sensitivity of hydrophone unit of towed line array testing system
Fig. 13. 5 Hz signal detected by hydrophone unit of towed line array
Fig. 14. 7.5 Hz signal detected by hydrophone unit of towed line array
Fig. 15. 10 Hz signal detected by hydrophone unit of towed line array
Fig. 16. Wavenumuber-frequency spectrum of Carpentermodel
Fig. 17. Sound pressure transfer function curve of the sheath based on Lindemann model
Fig. 18. Self noise power spectrum with the hydrophone of towed line array
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Table 1. Spacings with uncoated and coated WFBG arraysm
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