Sound field separation technique with double holographic planes and its applications in acoustic holography
Sound field separation technique with double holographic planes and its applications in acoustic holography
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发表时间：
2003
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通讯作者：
Chen Xinzhao
中科院分区：
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作者：
Chen Xinzhao
提出双全息面分离声场技术,克服以往近场声全息(NAH)和基于声强测量的宽带声全息(BAHIM)的应用局限。其局限性在于：全息平面一侧的声场必须是自由的，即所有的声源都必须限制在另一侧，但这在工业测量中不易实现。本文提出的声场分离技术利用波场的外推理论,建立起在波数域声场分离的公式,然后通过二维Fourier逆变换,便得到了全息面一侧声源产生的声压,从而达到声场分离的目的。原理的推导理论上论证该技术正确性,数值仿真显示了方法的可行性和有效性。
Sound field separation technique with double holographic planes is proposed, which overcomes the limitation on applications of near-field acoustic holography (NAH) and broadband acoustic holography from intensity measurement (BAHIM). The limitation is: sound field on one side of holographic plane must be free, that is to say, all the sound sources must be confined to the other side; but it is not easily to achieve on industrial measurements. The technique builds the sound field separation formula in wave number domain according to the wave field extrapolation theorem, and the sound pressure caused by sources on one side of holographic plane can be obtained as expected by taking two-dimensional Fourier transform of the formula. The derivation of the principle verifies the technique theoretically, and the numerical simulations demonstrate its feasibility and effectiveness.