乳化油覆盖海面的后向电磁散射特性研究  

Study on the Property of Microwave and Terahertz Wave Scattering from Emulsified Oil-Covered Sea Surface

作　　者：郑威 张彦敏[1] 王运华[1,2] 郑洪磊 Zheng Wei;Zhang Yanmin;Wang Yunhua;Zheng Honglei(Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;Laoshan Laboratory,Qingdao 266237,China)

机构地区：[1]中国海洋大学信息科学与工程学部,山东青岛266100 [2]崂山实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2024年第9期148-156,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41976167,52101393);山东省自然科学基金项目(ZR2021MD023)资助。

摘　　要：本文利用几何光学近似法,结合改进的局部平衡抑制比模型,并根据简化的双层粗糙面的反射系数,建立了乳化油覆盖海面的后向散射模型。基于该散射模型,研究了小入射角下,乳化油覆盖海面的后向散射特征,讨论了不同含水率下,后向散射系数随频率和油膜厚度的变化关系,以及散射系数对含水率的敏感性。结果表明:在微波波段,和非乳化油类似,乳化油覆盖海面的后向散射系数对油厚不敏感。而太赫兹波段,低含水率条件下,散射系数随油膜厚度和频率变化而振荡,且当频率增大时,散射系数振荡幅度减小。而含水率增大时,散射系数随油厚和频率的振荡幅度也逐渐减小。在微波波段和太赫兹波段范围内,对于频率较高的太赫兹波而言,其散射系数只对低含水率的乳化油具有较高的含水率敏感性;而对于频率较低的微波,其散射系数对含水率较高的乳化油也有较高的含水率敏感性。In this paper,the backscattering model of the emulsified oil-covered sea surface is established using the geometric optics(GO)approach,combined with the improved model of local balance and based on the simplified reflection coefficient for double-layer rough surface.Based on this scattering model,the backscattering characteristics of the emulsified oil-covered sea surface are investigated at small incidence angles,and the variation of the backscattering coefficient with frequency and oil slick thickness at different water contents,as well as the sensitivity of the scattering coefficient to the water content,are discussed.As the result shows,in the microwave band,similar to non-emulsified oil,the backscattering coefficient of emulsified oil-covered sea surface is insensitive to the oil thickness.In the THz band,the scattering coefficient oscillates with oil slick thickness and frequency for oil emulsion with small water content,and when the frequency increases,the amplitude of scattering coefficient oscillation decreases.The oscillation amplitude of the scattering coefficient with oil thickness and frequency also decreases gradually when the water content increases.In the microwave and THz bands,for high-frequency waves,the scattering coefficient is sensitive to water content only for emulsified oil with low water content;For low-frequency waves,the scattering coefficient is also sensitive to water content for emulsified oil with high water content.

关 键 词：乳化油 电磁散射 几何光学近似法 含水率 

分 类 号：P237[天文地球—摄影测量与遥感] TP722.6[天文地球—测绘科学与技术]