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| BRRDF Simulation Study on the Influence of Atmospheric Turbulence on LIF Detection of Sea Surface Oil Spill |
| XIE Bei-bei1, 2, ZHAO Jia-wei1, ZHOU Xuan-yu1, ZHANG Xiao-dan3, LIU Yu-jia4 |
1. School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China
2. Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province, Qinhuangdao 066004, China
3. School of Information Science and Technology, Hebei Agricultural University, Baoding 071001, China
4. School of Information and Communication Engineering, Beijing Information Science and Technology University, Beijing 100029, China
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Abstract Laser-induced fluorescence (LIF) can be integrated into unmanned aerial vehicles to build LIF radar systems for marine environmental monitoring. The LIF radar system operates in the atmosphere, where atmospheric turbulence induces signal attenuation. The Bidirectional Reflectance Distribution Function (BRRDF) can describe the fluorescence characteristics of oil-contaminated seawater. Based on the theory of atmospheric turbulence and the Monte Carlo method, a BRRDF model has been developed by us for studying oil-contaminated seawater. The model was used to simulate the BRRDF of oil-contaminated seawater under irradiance scintillation, beam wander, and beam spreading conditions. The simulation results demonstrate that the fluorescence signals exhibit isotropy, and their intensity is directly proportional to the intensity of the excitation light. The influence of beam wander on the fluorescence signals is weak and can be neglected. Under weak atmospheric turbulence conditions(Turbulence intensity parameters σ2R＜1), with the fluorescence signal intensity concentrated within the range of 2×10-5 to 5×10-5 and the fluorescence spot radius expanding from 1 to 5 mm, the LIF radar system can operate normally in the turbulent channel. Under moderate atmospheric turbulent conditions (σ2R≈1), the fluorescence signal fluctuates from 10-5 to 10-4. The fluorescence spot radius expands to 15 mm. The LIF radar system's resistance to turbulence needs to be improved by appropriately increasing the aperture of the receiving lens. Under strong atmospheric turbulent conditions (σ2R＝25), the LIF radar system connot detect the fluorescence signal. The analysis and discussion in this study can provide references for the design and optimization of LIF radar systems.
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Received: 2023-03-13
Accepted: 2023-09-11
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