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二维粗糙海面的光散射及其红外成像
引用本文:张延冬,吴振森.二维粗糙海面的光散射及其红外成像[J].光学学报,2002,22(9):039-1043.
作者姓名:张延冬  吴振森
作者单位:西安电子科技大学理学院,西安,710071
基金项目:国家自然科学基金 (6 0 0 810 0 2 )资助课题
摘    要:首先根据JONSWAP海面功率谱模型数值模拟出二维粗糙海面,采用几何光学近拟与基尔霍夫(Kirchhoff)标量近似计算了二维海面的光散射,计算中将每一面元看成一具有微粗糙度的粗糙面而不是近似地当作平面,并利用投影法与射线追踪法数值计算了一定入射角和散射角下的遮挡函数,有效地提高了海面光散射计算的精确性。最后利用太阳光的光谱辐照度数值模拟了海面的3μm-5μm红外散射图像,对于红外探测器抑制海面反射太阳光造成的亮带干扰具有一定的参考价值。

关 键 词:二维粗糙海面  光散射  几何光学近似  基尔霍夫标量近似  遮挡函数  红外成像
收稿时间:2001/6/18

Light Scattering and Imaging of Two-Dimensional Rough Sea Surface in the Infrared
Zhang Yandong,Wu Zhensen.Light Scattering and Imaging of Two-Dimensional Rough Sea Surface in the Infrared[J].Acta Optica Sinica,2002,22(9):039-1043.
Authors:Zhang Yandong  Wu Zhensen
Abstract:Two-dimensional rough sea surface is generated based on JONSWAP sea spectrum, then the geometric optics approximation and Kirchhoff approximation are applied to calculate the light scattering. Each facet is treated as a surface with small roughness instead of a smooth plane, and the shadowing function for arbitrary incident and scattering angles is obtained with the projecting and ray tracing methods, hence making the results more accurate. Finally the image of sea surface is simulated in the 3 μm~5 μm band, which is of great reference value for reducing the interference to the sensor operating in the infrared by the scattering of sunshine from rough surface.
Keywords:light scattering  geometric optics approximation  Kirchhoff approximation  shadow function  imaging in the infrared
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