摘要
针对远场声全息成像分辨率较差的问题,提出多孔声全息方法。利用多个小型传声器阵列进行优化布置,可以有效地提高分辨率,达到等效大阵列的声场可视化效果。首先推导了空间多孔加窗对远场Kirchhoff衍射积分声全息带来的干涉叠加效应;然后对主瓣宽度和旁瓣高度进行了定量计算,阐述了多孔优化布置方法,实现了旁瓣抑制条件下的分辨率最优;最后利用双音箱实验,验证了多孔声全息的可行性和理论分辨率,证明了多孔声全息方法的有效性。研究表明,多孔声全息的干涉叠加方法可以有效提高远场测量的重建分辨率,多孔声全息的优化设计方法可以实现旁瓣抑制条件下的分辨率最优。
A multi-aperture far-field acoustic holography method has been proposed to obtain a better resolution in sound field visualization. Several small microphone arrays were used to form an equivalent large array according to certain optimization criterions. Firstly, the interference effect of adding multiple finite spatial windows to Kirchhoff diffraction integration acoustic holography was studied. Secondly, the main lobe widths and side lobe ratios were calculated, and the optimization criterions for placing multiple microphone arrays were stated. Then, the experiments with two loudspeakers were employed to validate the multi-aperture far-field acoustic holography method. It has been proved that the interference effect of multi-aperture array can be used to improve imaging resolution, and the proposed criterions can be used to obtain optimized resolution in the far-field.
出处
《声学学报》
EI
CSCD
北大核心
2018年第1期76-82,共7页
Acta Acustica
基金
国家自然科学基金项目(51375252)资助
