[COMSOL总部博文精选]声学隐身 Cloaking – Many Different Varieties (2012-04-19 14:01:12) 转载▼
文章转载自comsol.com。 刚刚讨论了红外隐身,意犹未尽,在与大家分享一下声学隐身。 工作在声波频段的超材料(meta material)同样具有矢量的空间分布,意思是声学材料属性是一个矩阵,除了对角线外的元素,其他元素也有具体数值而不为0。与光学隐身和红外隐身一样,COMSOL这种全矢量的材料属性定义又有了用武之地。下图是COMSOL模型库中的一个声学隐身的算例。 原文链接:http://www.comsol.com/blogs/cloaking-–-many-different-varieties/ I had previously blogged about Thermal Cloaking, which uses layers of aluminum and paper to create an anisotropic structure and cloak a desired object. This differs from the “traditional” type of cloaking, of light and electromagnetic waves, which make use of metamaterials or layered structures that impose a negative refractive index to make the cloaked object appear transparent. Not as well-known, but still relevant to the field is acoustics modeling. It works similarly to electromagnetic cloaking although at the scale of acoustic wavelengths. The researcher in the Thermal Cloaking work, Sebastién Guenneau of Institut Fresnel-CNRS, has also modeled this application. So have we, and there is an example of this in our Model Gallery. |
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