Godin Oleg A
CIRES, University of Colorado and NOAA/Earth System Research Laboratory, Boulder, CO 80305, USA.
Phys Rev Lett. 2006 Aug 4;97(5):054301. doi: 10.1103/PhysRevLett.97.054301. Epub 2006 Aug 1.
We study long-range correlation of diffuse acoustic noise fields in an arbitrary inhomogeneous, moving fluid. The flow reversal theorem is used to show that the cross-correlation function of ambient noise provides an estimate of a combination of the Green's functions corresponding to sound propagation in opposite directions between the two receivers. Measurements of the noise cross correlation allow one to quantify flow-induced acoustic nonreciprocity and evaluate both spatially averaged flow velocity and sound speed between the two points.
我们研究了任意非均匀、运动流体中扩散声噪声场的长程相关性。利用流反转定理表明,环境噪声的互相关函数提供了对应于两个接收器之间相反方向声音传播的格林函数组合的估计。噪声互相关的测量允许人们量化流动引起的声学非互易性,并评估两点之间的空间平均流速和声速。