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OPTICAL DISTORTION IN THE FIELD OF A LITHOTRIPTER SHOCK WAVE

机译：光刻机激波场中的光学畸变

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The schlieren observation of cavitation phenomena produced in the tail of a lithotripter shock wave has indicated the presence of some interesting features. The images produced appear to indicate that cavitation transients in the field of a shock wave propagate nonsymmetrically; this is not the ease. The apparent lack of symmetry exhibited by the primary cavitation transients is due to a complex optical lensing effect, which is brought about by the change in refractive index associated with the pressure profile of the shock wave. Objects seen through or immersed in the shock-wave field of an electromagnetic acoustic transducer, such as cavitation, appear highly distorted because of the strong positive and negative lensing effects of the compression and rarefaction cycles of the shock wave. A modification of the schlieren technique called the scale method has been used to model the distortion introduced by the shock wave and consequently explain the cavitation distortion. The technique has also been used to quantitatively analyze and partially reconstruct the lithotripter shock wave. The combination of schlieren and scale imaging gives more information about the refractive index field and therefore the shock-wave structure itself. [References: 7]
机译：在碎石机冲击波的尾部产生的空化现象的奇特的观察表明存在一些有趣的特征。产生的图像似乎表明，冲击波场中的空化瞬态不对称地传播。这不是一件容易的事。初级气蚀瞬变表现出明显的不对称性是由于复杂的光学透镜效应，这是由与冲击波压力曲线相关的折射率变化引起的。透过或浸入电磁声换能器的冲击波场中的物体（如气蚀现象）由于冲击波的压缩和稀疏循环的强烈正负透镜效应而显得高度失真。 schlieren技术的一种改进，称为比例法，已被用于对冲击波引入的畸变进行建模，从而解释了空化畸变。该技术也已用于定量分析和部分重建碎石机冲击波。 schlieren和比例尺成像的组合可提供有关折射率场的更多信息，因此可提供有关冲击波结构本身的更多信息。 [参考：7]

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