The scattering of fog particle influence the images by three aspects: the attenuation of object light, the scattering of air light and the multi-scattering of fog particle.
雾滴的散射通过三个方面对图像产生影响：雾滴对成像光线的透射衰减，空气光即非成像光线的散射及雾滴的多次散射。
Based on the analysis of the existing theoretical model of ultrasonic attenuation, the model for ultrasonic attenuation of composite particle size distribution was established.
在分析现有超声波衰减理论模型的基础上，建立了混合粒度分布下超声波的衰减模型。
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