Index of content:
Volume 104, Issue 2, August 1998
- AEROACOUSTICS, ATMOSPHERIC SOUND 
Coherence functions of plane and spherical waves in a turbulent medium with the von Karman spectrum of medium inhomogeneities104(1998); http://dx.doi.org/10.1121/1.423348View Description Hide Description
This paper deals with line-of-sight sound propagation in a medium with the von Karman spectra of temperature and medium velocityfluctuations. The mean sound field, the coherence functions of plane and spherical waves and their coherence radii in such a medium are calculated analytically and numerically. It is found that the temperature and medium velocity contributions to these statistical moments of a sound field may differ significantly. The coherence functions of plane and spherical waves for the von Karman spectrum of medium inhomogeneities have been compared with those for the Kolmogorov and Gaussian spectra. The latter two spectra have been used widely in theories of sound propagation in random media. It is shown that, in limiting cases, the coherence functions calculated for the von Karman spectrum coincide with those calculated for the Kolmogorov and Gaussian spectra. This result supports the use of the Gaussian spectrum in theories of sound propagation in random media.