Resonance phenomena in dielectric media: A review and comparison of acoustic and electromagnetic modes

作     者：Gunnar Gidion Taimur Aftab Leonhard M.Reindl Stefan J.Rupitsch 

作者机构：Department of Microsystems EngineeringUniversity of Freiburg Georges-Köhler-Allee 10679110 Freiburg im BreisgauGermany 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2023年第13卷第4期

页      面：35-40页

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

主　　题：Whispering gallery dielectric resonator passive wireless microphone flue organ pipe ferroelectret sensor 

摘      要：The theory and application of resonances and vibrational modes are part of the foundation of *** this contribution,exam­ples of acoustical resonators are highlighted,and compared to electromagnetic *** an example from architecture,we describe the phenomenon of whispering galleries;such modes are nowadays known in dielectric and optical resonators.A speci­men of a semicircular whispering bench in Park Sanssouci in Potsdam is acoustically investigated and demonstrated to show low losses for sound propagation.A special acoustical bug is discussed which was used for the espionage of the *** in *** Sovyets could interrogate this passive device by radio *** working principle was based on the electromagnetic resonance of the cavity that the sound-sensitive membrane was part *** underlying relation between excitation and resonance is compared to the sound production in flue organ pipes.A stopped flue organ pipe was investigated using a piezoelectric film sensor inside the pipe *** results show that even-numbered modes,which are usually suppressed in the radiated sound of a stopped pipe,are still present in the vibrations inside the resonator.