| Visualization of the sound scattering by a cylinder |
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| 作者姓名： | WU Zhihao ZHOU Genxiang and FENG Shaosong |
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| 作者单位： | Shanghai Acoustics Laboratory，Academla Sinica. Shanghai 200032 |
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| 基金项目： | The projet is supported by National Natural Science Foundation of China |
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| 摘 要： | The schlieren method is applied to visualizing the sound scattering ofa cylinder immersed in the liquids.Images of the echoes,caused by normal andoblique incidence from a cylinder,are obtained for two kinds of liquids:(1)theliquid is composed of a transparent liquid;and(2)the liquid is composed of twonon-mixable transparent liquids.It is found experimentally that the echo canbe caused by the discontinaites in the shadow zone.This fact is utilized to dem-onstrate the locus of the helical surface wave creeping along the surface of thecylinder.For such cases the three-dimensional image can be described by thismethod and has not to use the system with special appliances and complexalgorithm.
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Visualization of the sound scattering by a cylinder |
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| Authors: | WU Zhihao ZHOU Genxiang and FENG Shaosong |
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| Abstract: | The schlieren method is applied to visualizing the sound scattering of a cylinder immersed in the liquids. Images of the echoes, caused by normal and oblique incidence from a cylinder, are obtained for two kinds of liquids: (1) the liquid is composed of a transparent liquid; and (2) the liquid is composed of two non-mixable transparent liquids. It is found experimentally that the echo can be caused by the discontinaites in the shadow zone. This fact is utilized to demonstrate the locus of the helical surface wave creeping along the surface of the cylinder. For such cases the three-dimensional image can be described by this method and has not to use the system with special appliances and complex algorithm. |
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| Keywords: | Scattering Greeping waves Schlieren Method |
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