Selected research in physical, structural, and underwater acoustics at WSU associated with Logan Hargrove’s ONR scientific program

Abstract

Logan Hargrove, during his service as an ONR scientific and program officer, facilitated basic research at Washington State University for two decades. The Hargrove era investigations included research into: acoustic scattering physics and holographic imaging for elastic objects in water, high-order caustic wave-fields, generation and holographic-verification of acoustic vortex beams, light scattering by bubbles and drops, acoustical and optical radiation forces, nonlinear wave interactions in heterogeneous media, and cavitation induced by shock-wave reflection. The scattering research progressed from symmetric objects to objects of greater complexity. While the bulk of the funds provided went to support graduate researchers, some laboratory improvements of lasting value were also facilitated through the ONR support. The impact of that support on ONR’s research interests and on the development of careers of several students who went on to make long term contributions to those interests will be summarized. While the emphasis is on the aforementioned two decades, some subsequent developments dependent on the facility improvements are also noteworthy. Recollections of some personal encouragement provided by Logan prior to receiving ONR support will also be noted. [Research supported by the Office of Naval Research.]