作者：杨枭杰, 郭世旭, 王月兵, 郝振宇, 赵鹏

作者单位：中国计量大学计量测试工程学院, 浙江 杭州 310018

关键词：声学;滤波函数;近场声全息;反向重构

摘要：

针对近场声全息反向重构时边缘误差造成的检测精度低的问题，开展基于振速反向重构的近场声全息滤波方法对比研究。以一个高为11.5 cm、半径为4.2 cm的圆柱形发射换能器为研究对象，通过数值仿真分析和实验测量对比二维Harris滤波窗函数、改进后的二维Harris滤波窗函数和W_Z滤波窗函数对边缘误差的抑制效果和反向重构声场幅值的误差大小。结果表明，3种滤波窗函数都可以在较短的反向重构距离范围内有效降低边缘误差，利用Harris滤波窗函数进行滤波在反向重构声场的幅值方面误差最小，但边缘误差抑制效果最差；W_Z滤波窗函数对反向重构距离的适用性最好，在更大的反向重构距离时，其对边缘误差的抑制效果更好，反向重构误差更小。

Comparison of three kinds of filtering methods based on near-field acoustic holographic vibration velocity reconstruction
YANG Xiaojie, GUO Shixu, WANG Yuebing, HAO Zhenyu, ZHAO Peng
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Abstract: With the regard to the problem of low detection accuracy induced by the edge error during the reverse reconstruction of near-field acoustic holography, the research by the comparison of filtering methods for near-field acoustic holography reversely reconstructed based on the vibration velocity was developed. With a cylinder transmitting transducer of 11.5 cm high and a radius of 4.2 cm as the object for the research, through the simulation analysis of values and the experimental measurement, the inhibitory effect of the 2D Harris filtering window function, the 2D Harris filtering window function after improvement and W_Z filtering window function on the edge error and the magnitude of error for the amplitude of reversely reconstructed sound field had been compared. The result shows that all the three kinds of filtering window functions effectively reduce the edge error within the scope of shorter reverse reconstructing distance, the error is the smallest for the filtering with the Harris filtering window function on the aspect of amplitude in the reversely reconstructed sound field, but the inhibitory effect on the edge error is the worst; the applicability of W_Z filtering window function on the reverse restructuring distance is the best. In a longer reverse restructuring distance, its inhibitory effect on the edge error is better; the reverse reconstructing error is smaller.
Keywords: acoustics;filter function;near-field acoustic holography;reverse reconstruction
2020, 46(2):40-45  收稿日期: 2018-12-07;收到修改稿日期: 2019-03-02
基金项目: 国家重点研发计划重点专项(2017YFF0206403)
作者简介: 杨枭杰(1994-),男,山东威海市人,硕士研究生,专业方向为水声计量测试技术
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