摘要
针对国内尚没有大角度范围的水体颗粒偏振体散射函数测量仪的问题,基于潜望镜式光路结构与旋转偏振探测器的探测方式,建立了水体颗粒偏振体散射特性测量系统,验证了采用半衰片胶合方式的出射棱镜对大角度偏振体散射特性测量的适用性,实现了10°~170°范围内3×3水体颗粒散射穆勒矩阵的测量。对系统开展了角度、幅值及偏振标定,根据系统结构和水下传输原理进行了散射光程归一化和水下衰减矫正。实验结果表明,3μm直径聚苯乙烯标准颗粒测量结果与理论计算值吻合良好,证明了该套系统的可靠性。同时在千岛湖自然水体对该套系统进行了测试验证,获得的水体颗粒物10°~170°范围内3×3水体颗粒散射穆勒矩阵测量结果表明偏振体散射特性能够提供更丰富的颗粒特性信息。
Objective The polarized volume scattering function of particles in water is the most basic and complete parameter describing their scattering characteristics as it reflects the types,particle size spectra,shapes,and refractive indexes of the molecules and large particles in water.Therefore,the polarized volume scattering function of particles in water is of great research significance.This function is the most critical inherent optical parameter in the study of active and passive ocean optical remote sensing.Nevertheless,it is also the inherent parameter most difficult to measure.To solve the problem that no instrument is currently available in China for measuring the polarized volume scattering function of particles in water in a large angle range,this paper develops a measurement system for the polarized volume scattering characteristics of particles in water on the basis of a periscope-like optical path structure and the detection method of the rotating polarization detector.It further verifies the applicability of an output prism obtained by the half attenuation bonding method to the measurement of the polarized volume scattering characteristics in a large angle range and achieves the measurement of the 3×3 scattering Mueller matrix of particles in water in the range of 10°-170°.Methods In this study,pure water was used for baseline measurements,and the scattering characteristics of particles were determined by removing the contribution of the pure water signal to the total signal.According to the characteristics of standard particles in the Mie scattering theory,a standard particle(diameter of 0.2μm)with relatively gentle Mie scattering results was used for amplitude calibration and calibration coefficient determination,and another one(diameter of 2μm)with salient angle characteristics was used for angle calibration.Polarization was performed with a Stokes meter.The scattered light received by the detector suggests that the scattering optical paths detected at all angles are not the same,and the attenua
作者
潘耀瑞
陶邦一
吴超钒
毛志华
黄海清
Pan Yaorui;Tao Bangyi;Wu Chaofan;Mao Zhihua;Huang Haiqing(Ocean College,Zhejiang University,Zhoushan 316021,Zhejiang,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,Zhejiang,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第18期378-388,共11页
Acta Optica Sinica
基金
国家自然科学基金面上项目(41876033)
国家重点研发计划项目(2022YFB3901704)。
关键词
水体颗粒
偏振
穆勒矩阵
体散射函数
particles in water
polarization
Mueller matrix
volume scattering function
