Infrared and Laser Engineering, Volume. 52, Issue 3, 20220507(2023)
Method and experiment of laser detection and tracking of ship wake
Figures & Tables(16)
Fig. 1. Distribution characteristics of ship wake. (a) Top view; (b) Transverse section; (c) Lateral profile
Fig. 3. Possible forms of detection. (a) Detection in wake; (b) Detection under wake
Fig. 8. Experimental system and process. (a) Detection system; (b) Experimental ship; (c) Detection system; (d) Lake test tracking pro-cess; (e) Schematic diagram of tracking process
Fig. 9. Water background laser scattering signal and bubble laser scattering echo signal. (a) Original signal; (b) Smoothed signal
Fig. 10. Water background laser scattering signal and bubble laser scattering echo signal. (a) Original signal; (b) Smoothed signal
Fig. 11. Water background laser scattering signal and bubble laser scattering echo signal. (a) Original signal; (b) Smoothed signal
Fig. 12. Water background laser scattering signal and bubble laser scattering echo signal. (a) Original signal; (b) Smoothed signal
Table 1. Wake distribution of common ships[11]
View tableView in ArticleTable 1. Wake distribution of common ships[11]
Destroyer model Speed/kn Thickness at 360 m/m Width/m Draft Rathborn 10-12 6.5±1.1 - - Hopewell 10 7.7±1.2 12 5.8 Evian 13 4.4±1.1 7.5 2.9
Table 2. Measured bubble distribution density in ship wake[16]
View tableView in ArticleTable 2. Measured bubble distribution density in ship wake[16]
Bubble radius/μm 1 min/m−3 3 min/m−3 5 min/m−3 1070 4.9×102 4.1×101 - 400 1.79×104 5.6×103 7.8×102 160 4.6×105 1.98×105 9.3×104 80 5.5×106 2.61×106 1.45×106 10-1070 2.83×108 1.32×108 7.16×107
Table 3. Simulation conditions for large vessel
View tableView in ArticleTable 3. Simulation conditions for large vessel
Simulation conditions Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Movement mode In/under wake In/under wake In/under wake In/under wake In/under wake In/under wake In/under wake In/under wake Bubble size/μm 20-80 80-140 140-200 200-260 260-320 320-380 380-440 440-500 Bubble thickness/m 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9 Bubble density/m−3 105-106 106-3×106 3×106-6×106 6×106-107 107-108 108-2×108 2×108-3×108 3×108
Table 4. Small vessel simulation condition settings
View tableView in ArticleTable 4. Small vessel simulation condition settings
Simulation conditions Zone 1 Zone 2 Zone 3 Zone 4 Movement mode In/under wake In/under wake In/under wake In/under wake Bubble size/μm 20-60 60-100 100-300 300-500 Bubble thickness/m 0-1 1-2 2-3 3-4 Bubble density/m−3 104-105 105-106 106-107 107
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Siguang Zong, Xin Zhang, Jing Cao, Shanyong Liang, Bin Li. Method and experiment of laser detection and tracking of ship wake[J]. Infrared and Laser Engineering, 2023, 52(3): 20220507
Paper Information
Category: Lasers & Laser optics
Received: Jul. 21, 2022
Accepted: --
Published Online: Apr. 12, 2023
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