二维正方晶格钢/水声子晶体方向带隙实验研究

摘要

Based on the ultrasonic immersion transmission technique, the directed band gaps of two-dimensional (2D) phononic crystal consists of a square array of steel cylinders in water were measured experimentally along the Γ-X and Γ-M directions of first irreducible Brillouin zone. The relations of layers and first band gaps stability can be analyzed in detail. This is better advantage of design for finite-sized 2D phononic crystal or acoustic devices. An excellent agreement between the frequency range of overlapping transmission spectra of acoustic waves and complete band gap of 2D phononic crystal for theoretical predict with plane wave expansion method is observe.%基于超声浸水透射技术,分别沿着二维正方晶格钢/水声子晶体第一布里渊Γ-X和Γ-M方向测试声带隙,详细分析了声子晶体Γ-X和Γ-M方向层厚和第一方向带隙稳定性的关系,进而为设计有限尺寸声带隙材料或声波器件提供重要参考依据.同时,对比了实验测得透射谱频率重合范围与平面波展开法计算完全带隙很好的吻合.