二维声学超材料透镜的设计与实验

发布时间：2018-03-20 00:36

本文选题：声学超材料　切入点：声学透镜　出处：《南京大学学报(自然科学)》2015年06期 　论文类型：期刊论文

【摘要】：基于等效媒质理论提出了一种由新型声学超材料设计的渐变折射率透镜.根据电磁学与声学基本参数存在的类比关系,参照电磁人工材料设计中提取单元结构的等效电导率和等效磁导率的方法,分别提取单元结构的等效弹性模量和等效质量密度,并进一步求得其等效相对阻抗和等效折射率,对设计的透镜进行有限元数值仿真在宽频范围内得到了与实验一致的偏折角度.该透镜由光敏树脂3D打印制成,与传统透镜相比,它具有尺寸小、设计简单、精度高,重量轻等特点.仿真结果和测试结果吻合较好,进一步验证了声电类比设计方法的可行性,为设计宽频带新型声学参数人工材料提供了一种新途径.
[Abstract]:Based on the equivalent medium theory, a gradient refractive index lens designed by a new type of acoustic supermaterial is proposed. According to the analogical relationship between electromagnetism and the basic acoustic parameters, According to the method of extracting the equivalent conductivity and the equivalent permeability of the element structure in the electromagnetic artificial material design, the equivalent elastic modulus and the equivalent mass density of the element structure are extracted, and the equivalent relative impedance and the equivalent refractive index of the unit structure are obtained. The deflection angle of the designed lens is obtained by finite element numerical simulation in the wide band range. The lens is made of Guang Min resin 3D printing. Compared with the traditional lens, the lens has the advantages of small size, simple design and high precision. The simulation results are in good agreement with the test results, which further verifies the feasibility of the design method of acoustoelectric analogy, and provides a new way for the design of new acoustic parameters artificial materials with wide band.
【作者单位】：东南大学毫米波国家重点实验室;
【基金】：江苏省杰出青年基金(BK2012019)
【分类号】：O441.6;TB39

【相似文献】