近场声全息成像方法的研究

本文对近场声全息成像方法的基本理论及特点做了简单介绍。针对声源重建问题的不适定性,提出一种新的空间频率域滤波方法——带约束条件的最小二乘法,改善了重建结果的稳定性。运用近场声全息成像的数字方法,对圆板的振动及其辐射声场进行了计算机模拟研究并验证了滤波处理的效果。本文还用自制的32阵元线阵扫描实验系统,对一个在空气中辐射400赫声波的小型扬声器的振动及声场进行了近场声全息成像研究,给出初步实验结果。

The research of near-field acoustical holography

This paper presents the theoretical analysis of the imaging method and characteristics of the Near-field Acoustical Holography (NAH).Aiming to the unstability of the source reconstruction,we present a new filtering method————least squares method for filtering with restraint,which improves the stability of the reconstruction.The computer simulant experiment for the vibration and radiation of a round plate by means of the numerical method of NAH has been done and the effect of the new filtering method has been tested.The NAH imaging research of the radiation of a small loudspeaker using a scanning linear receiving array of 32 elements has been made and the preliminary results are also given in the paper.