@article {:/content/asa/journal/jasa/140/3/10.1121/1.4962556, title = {Dynamic sound scattering: Field fluctuation spectroscopy with singly scattered ultrasound in the near and far fields}, journal = {The Journal of the Acoustical Society of America}, volume = {140}, number = {3}, year = {2016}, pages = {1992}, abstract = { Dynamic\ sound scattering\ (DSS) is a powerful acoustic technique for investigating the motion of particles or other inclusions inside an evolving medium. In DSS, this dynamic information is obtained by\ measuring\ the field autocorrelation function of the temporal\ fluctuations\ of singly\ scattered\ acoustic waves.\ The technique was initially introduced 15 years ago, but its technical aspects were not adequately discussed then. This paper addresses the need for a more complete account of the method by describing in detail two different implementations of this\ sound scattering\ technique, one of which is specifically adapted to a common experimental situation in ultrasonics. The technique is illustrated by the application of DSS to\ measure\ the mean square\ velocity\ fluctuations\ of particles in fluidized\ suspensions,\ as well as the dynamic\ velocity\ correlation length. By explaining the experimental and analytical methods involved in realizing the DSS technique in practice, the use of DSS will be facilitated for future studies of particulate\ suspension\ dynamics and particle properties over a wide range of particle sizes and concentrations, from millimeters down to nanometers, where the use of optical techniques is often limited by the opacity of the medium. }, doi = {http://scitation.aip.org/content/asa/journal/jasa/140/3/10.1121/1.4962556}, url = {https://asa.scitation.org/doi/10.1121/1.4962556}, author = {Cowan, M. L. and Page, J. H. and Norisuye, T. and Weitz, D. A.} }