基于声全息的超透镜成像改进方法研究

针对空间Fourier变换的倏逝波近场声全息研究方法存在的缺陷,提出了在近场用声学超透镜代替离散分布在全息面上的声传感器的改进方法。先将声源信息汇聚于一点,再用声压传感器在聚焦点采集声源信息,实现声源识别、定位以及重建,从而有效地避免因离散采集而带来的"窗效应"和"卷绕误差"。建立物理模型,运用COMSOL软件模拟仿真,得到入射波与透镜汇聚声波的能量值比值接近1,成像效果良好,应用前景广阔。

Research on the improved method of super lens imaging based on acoustic holography

In view of the presence defects of spatial Fourier transform of the evanescent wave near field acoustic holography method, a improvement method is proposed which using acoustic super lens to replace discrete distribution of the acoustic sensor on hologram surface. First, we make the sound source information gathering to a point, then the sound pressure sensor collecting a sound source information in focus, achieving sound source identification, location and reconstruction. Thereby effectively avoiding "window effect" and "wraparound error" caused by discrete sampling . And the physical model is established , using the COMSOL software to simulate, we can obtain the acoustic energy value ratio of incident wave and lens convergence wave is close to 1, the imaging effect is good. This method have broad application prospects.