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Supercritical parametric wave phase conjugation as an instrument for narrowband analysis in ultrasonic harmonic imaging

机译:超临界参数波相位共轭作为超声谐波成像中窄带分析的工具

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摘要

Supercritical parametric wave phase conjugation (SWPC) is used for selection and phase conjugation of harmonic components of a nonlinear incident wave. The amplitude of the phase conjugate wave in a supercritical mode is high enough for acoustic nonlinearity of the propagation medium to appear. As a result, in particular, doubled and quadrupled frequencies of the incident wave become available for image formation at the same order of the medium nonlinearity. The improvement of the imaging system resolution because of harmonic analysis of the received acoustic signal and compensation of phase distortions caused by wave phase conjugation were observed simultaneously when the propagation medium was inhomogeneous.
机译:超临界参数波相位共轭(SWPC)用于非线性入射波的谐波分量的选择和相位共轭。在超临界模式下,相位共轭波的振幅足够高,足以使传播介质出现声学非线性。结果,尤其是,入射波的两倍和四倍频率变得可用于以介质非线性的相同顺序进行图像形成。当传播介质不均匀时,同时观察到由于接收到的声信号的谐波分析而引起的成像系统分辨率的提高以及由波相位共轭引起的相位失真的补偿。

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