Douglas M. Photiadis
Brian H. Houston
Naval Res., Code 7131, Washington, DC 20375-5000
Jonathan E. Spanier
SFA Inc., Landover, MD 20785 and NRL Code 7136
The scattered field from an irregularly ribbed, fluid-loaded plate has
been the subject of several recent investigations; one has proposed the
existence of dispersive wave phenomena that is due to interference between
Bragg diffraction and locally propagating Bloch waves [D. M. Photiadis, J.
Acoust. Soc. Am. 91, 1897--1903 (1992)]. Recent measurements at NRL have
confirmed the existence of such interference patterns in the scattered pressure
field of a fluid-loaded cylinder having nearly periodically spaced ribs in the
frequency region of 4.0