基于声压-振速测量的单面声场分离技术

在近场声全息技术的基础上，研究了基于声压-质点振速测量的单面声场分离技术.分析了现有基于Fourier变换的单面声场分离技术中的奇异性问题，并应用波数域谱平均法提出了去除奇异性的修正声场分离公式.为改善分离效果，减小由于Fourier变换引起的卷绕误差等因素的影响，基于统计最优近场声全息提出了一种新的单面声场分离方法.通过仿真分析对各种单面声场分离方法做了比较，并用Microflown公司的声强探头做了基于声压-振速测量的单面声场分离实验研究，验证了提出的修正公式和基于统计最优单面声场分离方法的正确性和有效性. 关键词： 声场分离 近场声全息 统计最优 Fourier变换

Sound field separation technique based on single surface measurement using pressure-velocity transducers

The sound field separation technique based on single surface measurement is investigated in this paper. A modified separation formula based on the spatial Fourier transform is presented to overcome the inherent singularity of the current single surface separation technique. However due to the wraparound error associated with fast Fourier transform (FFT) , the accuracy of separation technique based on FFT is not satisfactory and a novel separation method based on the statistically optimized nearfield acoustic holography is proposed to improve the separation. The simulations as well as experiments carried out with the p-u intensity probe produced by Microflown demonstrate the validity of the proposed modified formula and the effectiveness of the new separation method.