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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.
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 liquid. It is experimentallyally 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.