AN ACOUSTIC LENS WITH A LOW DISPERSIVE METAMATERIAL

摘要

The present invention relates to an acoustic lens having an approximate specific dispersion metamaterial. According to the present invention, a sound metamaterial nearly regardless of a frequency is invented for first time; and the acoustic convex lens is manufactured by being applied with the sound metamaterial. A two-dimensional face centered orifice cubic (FCOC) unit cell lowers a frequency speed of a sound wave regardless of the frequency to increase a sound refraction value. The FCOC unit cell is able to be used as a unit cell of a new metamaterial lowering the speed of the sound wave. The two-dimensional acoustic convex lens corresponding to a normal convex lens is invented using a plurality of FCOC unit cells. The two-dimensional acoustic convex lens is able to collect an acoustic wave in a same method as that of the normal convex lens. The acoustic lens having the approximate specific dispersion material includes an orifice and a cylindrical acoustic wave guide.