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.
实验结果表明：超声波在高水基流体介质中的衰减与一定范围的介质浓度存在较好的线性关系。
The results of experiments show that there are obvious linearity relationship between the attenuation of ultrasonic and the concentration of high water based fluid in some ranges.
在高温状态下，超声波探伤实施的关键在于声耦合、声衰减和声路径的控制。
The linchpin of undertaking high temperature ultrasonic testing is the control of the coupling, attenuation and route of the sound.
材料对超声波的衰减是影响超声波探伤仪检测能力的主要因素之一。
Attenuation of ultrasonic wave by material is one of main factors influencing detection capability of ultrasonic wave defectoscope.
超声波在岩石中的衰减特征通常用岩石吸收品质因子(Q值)来表征。
The ultrasonic attenuation character in the rock is usually expressed by rock absorbability quality factor (q).
采用数字手段测取了超声波信号的衰减系数，通过衰减系数可得出含沙量。
By using the digital means, the attenuation coefficient of the ultrasonic signal is measured, through which the sediment content can be obtained.
采用时间增益补偿技术，补偿超声波在空气中的衰减，减少回波信号的起伏；由有源全波整流电路和微分电路等组成峰值时间检测电路，可正确检测回波的峰值到达时间。
The peak time detecting circuit which is composed of full-wave rectification circuit and differential circuit can detect the reach time of echo signal accurately.
采用时间增益补偿技术，补偿超声波在空气中的衰减，减少回波信号的起伏；由有源全波整流电路和微分电路等组成峰值时间检测电路，可正确检测回波的峰值到达时间。
The peak time detecting circuit which is composed of full-wave rectification circuit and differential circuit can detect the reach time of echo signal accurately.
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