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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >The measurement of backscatter coefficient from a broadband pulse-echo system: a new formulation
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The measurement of backscatter coefficient from a broadband pulse-echo system: a new formulation

机译：宽带脉冲回波系统后向散射系数的测量：一种新公式

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摘要

A new formulation for obtaining the absolute backscatter coefficient from pulse-echo measurements is presented. Using this formulation, performing the diffraction correction and system calibration is straightforward. The diffraction correction function for the measurement of backscatter coefficient and the acoustic coupling function for a pulse-echo system are defined. Details of these functions for two very useful cases are presented: a flat disk transducer and a spherically focused transducer. Approximations of these functions are also provided. For a flat disk transducer, the final formulation appears as a modification to the established Sigelmann-Reid formulation. For a focused transducer, the final correction is a weak function of frequency when the scattering volume is near the focal area, rather than the frequency squared dependence proposed by earlier investigators.
机译：提出了一种从脉冲回波测量中获得绝对反向散射系数的新公式。使用此公式，执行衍射校正和系统校准非常简单。定义了用于测量后向散射系数的衍射校正函数和用于脉冲回波系统的声耦合函数。给出了两种非常有用的情况下这些功能的详细信息：平板传感器和球形聚焦传感器。还提供了这些功能的近似值。对于平板换能器，最终配方似乎是对已建立的Sigelmann-Reid配方的修改。对于聚焦换能器，当散射体积接近焦点区域时，最终校正是频率的弱函数，而不是早期研究者提出的频率平方依赖性。

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