近场声全息对振动体及其辐射场的成像

IMAGING FOR VIBRATION MODE AND RADIATION FIELD OF VIBRATING OBJECT USING NAH

本文综述了我所在近场声全息(NAH)对振动物体的振模及其辐射场成像研究方面取得的进展与成果。在广义全息重建算法中,提出一种克服重建不适定性的空间频域滤波函数,改善了图像质量。利用自建的实验系统,成功获得典型振动体,特别是首次获得具有特殊形状的模拟编磬在不同频率下的振模及其相应的空间矢量声强分布。研究了它们之间有趣的对应关系。证明NAH是研究任意形状物体及其辐射场的有效手段。

The progress and achievements in the research of imaging for vibration mode and radiation field of vibrating object using NAH in our institute have been comprehensively presented in the paper. In the reconstruction algorithm of generalized holography, we present a new spatial frequency domain filtering function, which improves the imaging quuality and overcomes the unstability of reconstructed results. Using a NAH experimental system for airborne sound constructed in our own laboratory we successfully obtained the vibration modes and acoustic-intensity vector field for several typical objects, in which the Chime Stone simulator has a special shape, and it is studied for the first time. We also analyzed the interesting relation between modes and fields. The above results show that NAH is an effective means to research on the vibration mode and its radiation field of arbitrary shape.