Yang Chengfu, Huang Ming, Yang Jingjing, Yang Meixia, Mao Fuchun, Hu Baojing
School of Information Science and Engineering, Yunnan University, Number 2 North Cuihu Road, Kunming 650091, People's Republic of China.
College of Science, Yunnan Agricultural University, Number 152 Fengyuan Road, Kunming 650201, People's Republic of China.
J Acoust Soc Am. 2019 Jul;146(1):505. doi: 10.1121/1.5118244.
An acoustic illusion device that can act as an invisible cloak or a shifting medium depending on the value of shift distance, which is about twice the circum-radius of the outer polygon, is proposed and designed based on linear coordinate transformation. A multi-folded transformation approach is used to design an illusion device with a circular opening window that allows for information interaction with the outside world. The results show that the proposed device can hide objects with arbitrary shapes or positions. Furthermore, in order to remove the material anisotropy of the proposed illusion device, a layered structure composed of homogenous and isotropic material is used based on the effective medium theory. The combination of the layered structure and the circular opening provide a flexible and feasible approach to achieve the partial implementation of the illusion device. It is hoped that these results may open an avenue for designing and implementing invisibility cloaks or illusion devices, and speed up potential applications for noise shielding, target camouflage, or target protection from active sonar signals.
提出并设计了一种声学幻象装置，该装置可根据位移距离的值充当隐形斗篷或可变介质，位移距离约为外部多边形外接圆半径的两倍，其基于线性坐标变换。采用多重变换方法设计了一种带有圆形开口窗口的幻象装置，该窗口允许与外界进行信息交互。结果表明，所提出的装置可以隐藏任意形状或位置的物体。此外，为了消除所提出的幻象装置的材料各向异性，基于有效介质理论使用了由均匀各向同性材料组成的分层结构。分层结构和圆形开口的结合为实现幻象装置的部分实现提供了一种灵活可行的方法。希望这些结果可以为隐形斗篷或幻象装置的设计和实现开辟一条道路，并加速在噪声屏蔽、目标伪装或有源声纳信号目标保护方面的潜在应用。
