研究闪光照相中影响材料有效吸收系数的两个主要因素，即X光的能谱效应和散射影响。
The paper analytically discusses two factors, the spectrum of photon and the scattered radiation by the detector, which affect the attenuation efficient of the object in flash X-ray radiography.
当气体介质等温、均匀时，分别计算气体介质的普朗克平均吸收系数、有效吸收系数和壁面入射平均吸收系数。
While the gas medium is isothermal uniformed, the dissertation calculates the effective absorption coefficient, the Planck-mean absorption coefficient and the wall-incident mean coefficient.
文中分别得出了透射线及多次衍射线功率的表达式以及有效线吸收系数。
Separate expressions for the transmitted, and multiply diffracted power are obtained, which enable the effective absorption coefficient to be calculated.
结果表明，低吸收系数光纤泵浦端温度相对较低，分布较为平缓，有效减缓光纤的热损伤。
It is shown that the temperature of the fiber with low absorption coefficient is comparatively low and the temperature distribution is very smooth, so the thermal damage can be effectively avoided.
对于垂直均匀分布海水，提出了利用机载海洋激光雷达数据估计系统的有效衰减系数、海水的体积吸收系数、体积衰减系数和体积散射系数的方法。
Through the observing system of water inherent optical properties, which were developed by WETlabs Inc, the backscattering and scattering coefficients of Lake Taihu had been obtained in Oct.
对于垂直均匀分布海水，提出了利用机载海洋激光雷达数据估计系统的有效衰减系数、海水的体积吸收系数、体积衰减系数和体积散射系数的方法。
Through the observing system of water inherent optical properties, which were developed by WETlabs Inc, the backscattering and scattering coefficients of Lake Taihu had been obtained in Oct.
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