Research on Planar Rotary spiral array applied in Near-field Acoustical Holography

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (5) : 122-127.

The application of a normal planar spiral acoustic array in acoustical imaging was discussed. To remedy the limitation of imaging performance at low frequency, an equivalent source model was introduced in near-field acoustical holography (NAH). To enhance the quantity of the image, a rotation scanning measurement system without referring microphone was proposed. A numerical method is designed to estimate the phase information of scanning data and synchronize the phase of different time. Numerical simulations results verified the viability and superiority. A series experiment confirmed the conclusion and reconstructed the image of the sound source below 450Hz. This method has low requirement on the conditions and provides reliable results. The conclusion is valuable for similar studies。

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The application of a normal planar spiral acoustic array in acoustical imaging was discussed. To remedy the limitation of imaging performance at low frequency, an equivalent source model was introduced in near-field acoustical holography (NAH). To enhance the quantity of the image, a rotation scanning measurement system without referring microphone was proposed. A numerical method is designed to estimate the phase information of scanning data and synchronize the phase of different time. Numerical simulations results verified the viability and superiority. A series experiment confirmed the conclusion and reconstructed the image of the sound source below 450Hz. This method has low requirement on the conditions and provides reliable results. The conclusion is valuable for similar studies。

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CHEN Lin-song1 CAO Yue-yun2 GUO Wen-yong2 . Research on Planar Rotary spiral array applied in Near-field Acoustical Holography[J]. Journal of Vibration and Shock, 2015, 34(5): 122-127

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