基于质点振速测量的近场声全息技术

Near Field Acoustical Holography Study Based on Measurement of Particle Velocity

现有的近场声全息技术都是通过在声源近场测量声压来重建和预测声场,并实现声场的可视化。采用同样反映声场特征的质点振速来进行声全息计算,并推出了基于振速测量的近场声全息重建公式,通过仿真验证了该方法的正确性、可行性和有效性。通过与用声压重建的结果相比较,表明本方法的边缘重建精度高的特点;用质点振速重建可以采用更小的全息面来获得同样的重建精度。

The current near field acoustic holography techniques are all based on the measurement of the pressure. In the paper, the method as well as the formulation based on the measurement of the particle velocity was proposed to reconstruct the acoustic field. The feasibility and correctness of the proposed method were validated by the numerical simulation. By comparing with the results based on the pressure, this new method has higher precision and smaller reconstruct error on the edge of the reconstruct plane, and it can achieve the same precision by smaller measurement aperture.