ASA 127th Meeting M.I.T. 1994 June 6-10

2pPA13. Answer to criticism of experiments on the scattering of sound by sound.

Peter J. Westervelt

Dept. of Phys., Brown Univ., Providence, RI 02912

On page 1982 of their article, Berntson et al. [J. Acoust. Soc. Am. 86, 1968 (1989)] criticized virtually all experimental results on the scattering of sound by sound. In addition they gave their necessary conditions for this scattering to be observed. These conditions were fulfilled in a recent experiment [R. Roy and J. Wu, in Proceedings of the 13th ISNA, edited by H. Hob(ae ligature)k (Elsevier Science, London, 1993)] where no scattered sound was obtained in spite of the fact that the minimum detectable signal level was of the order of 50 dB below Ingard and Pridmore---Brown's theoretical predictions. The one-dimensional treatment given in the previous abstract to two space-time dimensions will be discussed further.