水下光辐射测量的阴影效应及其校正方法研究

A study on shading error and correctiton of underwater optical measurements

用后向Monte Carlo模拟方法计算多仪器水下光学系统测量水体向上辐亮度和辐照度时由测量系统阴影导致的误差,给出了这种误差与入射太阳光相对于仪器的水平方位角之间的关系,给出了测量船对测量的影响与入射太阳光天顶角之间的关系.提出了一种辐亮度仪器自阴影误差的多光谱校正方法,模拟结果表明校正后误差小于5％.

The self-shading measurement error of the upwelling radiance and irradiance in different depths of infinite deep-sea water due to a optical system consisting of eight separated instruments and a rectangular frame is calculated with backward Monte Carlo technique. The relationship between the error and the sunlight azimuth relative to the system is showed. The error for different sun zeniths due to the coexisting of the system and ship is calculated as well. A multispectral iterated method for correcting the self-shading errors of remote sensing reflectance due to the Lu radiance instrument is given. Modeling computation shows that the corrected errors are less than 5% for Case 1 sea waters with chlorophyll concentration lower than 120.00 mg/m3.