Abstract
Discovery of the parametric acoustic array, that is, its principle, by P. J. Westervelt [J. Acoust. Soc. Am. 35, 535–537 (1963)] is justly famous. Reasons are given for this claim, including its unprecedented character and its usefulness, which is witnessed by a number of operational acoustical devices whose applications span subbottom profiling, marine archaeology, mine detection, and fish swimbladder resonance absorption spectroscopy, among others. New applications continue to be found, as to backscattering by swimbladder-bearing fish for sizing and quantification. These applications may be supported and extended by current efforts to develop a standard-target calibration protocol. While the larger community has pursued such applications, while also defining limits to the performance of the parametric acoustic array, the achievement represented by the essential discovery remains undiminished. In this tribute, some comments are also made of a personal sort on Westervelt’s approach to science and teaching.
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