Biomedical Engineering and Bioengineering Commons^™

Underwater Sound Transmission Through Arrays Of Disk Cavities In A Soft Elastic Medium., David C. Calvo, Abel L. Thangawng, Christopher N. Layman, Riccardo Casalini, Shadi F. Othman

All Faculty Articles - School of Engineering and Computer Science

Scattering from a cavity in a soft elastic medium, such as silicone rubber, resembles scattering from an underwater bubble in that low-frequency monopole resonance is obtainable in both cases. Arrays of cavities can therefore be used to reduce underwater sound transmission using thin layers and low void fractions. This article examines the role of cavity shape by microfabricating arrays of disk-shaped air cavities into single and multiple layers of polydimethylsiloxane. Comparison is made with the case of equivalent volume cylinders which approximate spheres. Measurements of ultrasonic underwater sound transmission are compared with finite element modeling predictions. The disks provide a …