基于波叠加法的近场声全息重建参数选取研究

基于波叠加法近场声全息的基本原理，分析了使用波叠加法进行声场重建时结果不准确的原因。研究了重建距离、重建频率、等效源的数目、等效源的半径及信噪比等参数变化对重建精度的影响。研究结果表明，与空间傅里叶变换法的平面近场声全息相比，波叠加法近场声全息拓展了重建距离的适用范围；波叠加法近场声全息对5 kHz以下声源的重建效果较好；等效源半径最好选为辐射体半径的0.8倍以下。

Research on Reconstructive Parameters Extraction by Near field Acoustical Holography Based on Wave Superposition

Based on the principles of near field acoustical holography by wave superposition, the causes of inaccurate results generated by the equivalent source collocation and noise are analyzed. The effects of the variety of reconstructive parameters including reconstructive distance, reconstructive frequency, equivalent source numbers, equivalent source radius and signal to noise ratio (SNR) on the reconstructive precision have been studied in this work. The results show that the proposed near field acoustical holography based on wave superposition method has expanded the application range of reconstructive distance comparing with the planar near field acoustical holography based on the space Fourier transform method. The reconstruction of acoustic source at below 5 kHz can obtain good result by using the near field acoustical holography based on wave superposition method. The equivalent source radius is selected as less than 0.8 times of that of the radiator at the best.