Patch near field acoustic holography based on particle velocity measurements.
Patch near field acoustic holography based on particle velocity measurements.
复制标题
DOI：
10.1121/1.3158819
复制
发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
Yong-Bin Zhang;F. Jacobsen;C. Bi;Xinzhao Chen
中科院分区：
文献类型：
--
作者：
Yong-Bin Zhang;F. Jacobsen;C. Bi;Xinzhao Chen
基于声压测量的贴片近场声全息术 (PNAH) 可以通过测量与关注源区域大小相当的表面位置处的声压来重建源附近的源场。粒子速度是 NAH 的替代输入量，并且最近已经证明了使用粒子速度的法向分量而不是声压作为基于传统空间傅里叶变换的 NAH 的输入以及作为 NAH 的统计优化变体的输入的优点。本文研究了使用粒子速度作为 PNAH 的输入。由于粒子速度向测量孔径边缘的衰减速度比压力衰减得更快，并且由于从压力到速度进入反向传播器的波数比放大了高空间频率，因此基于粒子速度测量的 PNAH 可以在迭代次数减少的情况下提供比基于压力的 PNAH 更好的结果。模拟研究以及使用压力-速度声强探头进行的实验证明了这些发现。
Patch near field acoustic holography (PNAH) based on sound pressure measurements makes it possible to reconstruct the source field near a source by measuring the sound pressure at positions on a surface that is comparable in size to the source region of concern. Particle velocity is an alternative input quantity for NAH, and the advantage of using the normal component of the particle velocity rather than the sound pressure as the input of conventional spatial Fourier transform based NAH and as the input of the statistically optimized variant of NAH has recently been demonstrated. This paper examines the use of particle velocity as the input of PNAH. Because the particle velocity decays faster toward the edges of the measurement aperture than the pressure does and because the wave number ratio that enters into the inverse propagator from pressure to velocity amplifies high spatial frequencies, PNAH based on particle velocity measurements can give better results than the pressure-based PNAH with a reduced number of iterations. A simulation study, as well as an experiment carried out with a pressure-velocity sound intensity probe, demonstrates these findings.