English
资源说明：Acoustic wave propagation in layered media is very important topic for many practical
applications including medicine, optics and applied geophysics. The key parameter
controlling all effects in layered media is the scaling factor given by the ratio between the
wavelength and the layer thickness. Existing theory mostly covers the solutions derived for
the low-frequency and high-frequency limits. In the first limit, when the wavelength is
much larger than the layer thickness, the layered medium is substituted by an effective medium with the properties given by special technique called the Backus averaging. In the
second limit, when the wavelength is much smaller than the layer thickness, we can use the
ray theory to compute both reflection and transmission responses.
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