Spectral Shifts of Ultrasonic Propagation through Media with Nonlinear Dispersive Attenuation
Spectral Shifts of Ultrasonic Propagation through Media with Nonlinear Dispersive Attenuation
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具有非线性色散衰减的超声波在介质中传播的谱移
DOI：
10.1177/016173468200400304
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发表时间：
1982
影响因子：
2.3
通讯作者：
P. Jaeger
中科院分区：
文献类型：
--
作者：
J. Ophir;P. Jaeger
研究了通过有损介质传播的具有高斯幅度谱的脉冲的中心频率下移和传输带宽之间的关系，该介质具有幂律频率依赖性的衰减。通过替代法通过多次窄带衰减测量来表征组织等效材料。对数据进行幂律曲线拟合。曲线参数用于预测中心频率下移与从第二次实验获得的传输带宽的行为。结果证实了数学模型。
The relationship between center frequency downshift and transmitted bandwidth was investigated for a pulse with Gaussian amplitude spectrum propagating through a lossy medium with power law frequency dependence of attenuation. Tissue equivalent material was characterized by multiple narrowband attenuation measurements, via a substitution method. Power law curves were fitted to the data. The parameters of the curves were used to predict the behavior of the center frequency downshift vs. transmitted bandwidth obtained from a second experiment. The results confirm the mathematical model.