Identification of whispering gallery type waves on a finite cylindrical shell using MIIR

Abstract

Experiments were conducted at Laboratoire d'Electronique et d'Automatique (ULTRASONS) to confirm the presence of whispering gallery type waves on a finite cylindrical shell bounded by hemispherical endcaps. The method of isolation and identification of resonances (MIIR) developed by the research team at ULTRASONS was used to obtain the histatic mode patterns that conclusively identified the modes observed monostatically by researchers at the Naval Research Laboratory. The radiation patterns for the several low-order whispering gallery modes were identifiable when the cylindrical shell was insonified normal to its major axis. Unequivocal identification of higher-order modes was inhibited by the presence of waves traveling along other circumferential paths.