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。
Based on the analysis of the existing theoretical model of ultrasonic attenuation, the model for ultrasonic attenuation of composite particle size distribution was established.
目的：探索胃肠内容物的声学特性及超声波经过胃肠内容物的衰减规律。
Objective: To research the acoustical quality of gastrointestinal contents and the attenuation criterion of ultrasound passing through gastrointestinal contents.
超声波具有指向性好，在水中衰减小，束射特性优良。
Ultrasonic has a good pointing, the attenuation in water is small, beam radio feature fine.
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