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提出了一种基于带限信号恢复算法的近场声全息空间分辨率增强方法.该方法利用实测全息面声压信号的波数域带限特性,采用带限信号恢复算法——Papoulis-Gerchberg方法(PGA)对全息面声压信号进行插值,从而等效地增加了全息面声压数据,减小了测量间隔,一定程度上恢复由于测量间隔太大而损失了的高波数成分,从而有效地提高了全息图像的分辨率.单点激励固支板声全息实验表明,该方法可以有效提高近场声全息图像的分辨率.
A method for spatial resolution enhancement of near-field acoustic holography based on the band-limited signal restoration algorithm is proposed. By using the band-limited band-limited properties of the measured holographic surface acoustic pressure signal, a band-limited signal recovery algorithm named Paphoulis-Gerchberg method PGA) to interpolate the holographic sound pressure signal, which effectively increases the holographic surface acoustic pressure data, reduces the measurement interval, and to some extent restores the high wavenumber components lost due to the too large measurement interval to effectively increase The resolution of the holographic image is obtained.The experimental results show that this method can effectively improve the resolution of the near-field acoustic holography image.