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| Scattering Characteristics of Marine Mixed Suspended Particles to Blue and Green Lasers |
| WANG Ming-jun1, 2, 3, WANG Zhu-yu1, HUANG Chao-jun2 |
1. School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China
2. School of Physics and Telecommunications Engineering, Shaanxi University of Technology, Hanzhong 723001, China
3. Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks, Xi’an 710126, China
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Abstract The transmission of laser underwater is largely affected by suspended particles in seawater. At present, most theoretical studies on the light scattering of suspended particles in the ocean are carried out on single-component suspended particles. However, suspended particles in the real ocean exist in a group of particles mixed with multiple components. Therefore, it is of great significance to study the scattering characteristics of blue-green lasers by mixed suspended particles in the real ocean. In this paper, five common suspended particles which have a greater impact on the transmission of blue-green lasers are planktonic algae, suspended sediments, debris, suspended bubbles, and minerals as the research objects. Fully considering the different mixing situations of these five suspended particles in real sea conditions, a model of the scattering characteristics of blue-green lasers by mixed spherical suspended particles in seawater is constructed. The statistical average light scattering parameters and average scattering phase function of 532 nm blue-green lasers of spherical suspended particles mixed with five seawater substances are calculated numerically. They are analyzing the influence of the mixing ratio of different mixed suspended particles on the average scattering, absorption and extinction coefficients and single albedo with the effective radius of the particles and the change of the particle number concentration. At the same time, the influence of different mixing ratios under different particle sizes on the average scattering phase function of mixed suspended particles with angle changes is analyzed. Numerical results show that the average scattering coefficient increases when the proportion of suspended sediment in the entire mixed model increases, while the average absorption coefficient increases with the proportion of suspended algae particles in the entire mixed model. It can be seen that among the five common suspended particles that have a major impact on the light in the ocean, suspended sediment has the greatest impact on light scattering, and suspended algae particles have the greatest impact on light absorption. As the concentration of suspended particles increases, the single albedo of the mixed particles remains unchanged. One can see that the average light scattering parameters of the mixed suspended particles are consistent with the increase in particle concentration. The average scattering phase function of mixed suspended particles in the ocean increases with the increase of the effective radius of the particles. The average scattering phase function of suspended particles under the mixing ratio with the largest scattering effect is the largest, and the forward scattering of suspended particles is strong. This work has important theoretical significance for the blue-green laser transmission in seawater, channel modeling, the research of underwater wireless optical communication and the laser target detection in seawater.
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Received: 2021-05-09
Accepted: 2021-07-08
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