Ultrasonic reflection mode imaging of the nonlinear parameter B/A: I. A theoretical basis
Ultrasonic reflection mode imaging of the nonlinear parameter B/A: I. A theoretical basis
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非线性参数B/A的超声反射模式成像：一、理论基础
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发表时间：
1986
期刊：
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通讯作者：
C. Cain
中科院分区：
文献类型：
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作者：
C. Cain
给出了一种获取非线性参数B/A的反射模式图像和透射模式图像的新方法的理论基础。推导了正弦探针波形中由于与沿相反方向传播的任意泵浦波形的非线性相互作用而产生的瞬时（非累积）相移的表达式。该瞬时相移与泵浦波形与沿泵浦和相互作用探针的传播路径的非线性参数 B/A 的空间分布的卷积成正比。可以实时获得探头的瞬时相位，从而测量 B/A 沿图像线的变化。
The theoretical basis of a new method for obtaining both reflection and transmission mode images of the nonlinear parameter B/A is given. An expression for the instantaneous (not cumulative) phase shift in a sinusoidal probe waveform due to nonlinear interaction with an arbitrary pump waveform propagating in the opposite direction is derived. This instantaneous phase shift is proportional to the convolution of the pump waveform with the spatial distribution of the nonlinear parameter B/A along the propagation path of the pump and interacting probe. The instantaneous phase of the probe can be obtained in real time giving a measure of the variation of B/A along an image line.