Title :
Resonance of surface waves on spheres
Author :
Shui, Y. ; Royer, D. ; Dieulesaint, E. ; Sun, Z.
Author_Institution :
Lab. of Acuostoelectr., Univ. Pierre & Marie Curie, Paris, France
Abstract :
Rayleigh and whispering gallery waves have been excited in a steel sphere of 20 nm diameter by a YAG (yttrium aluminum garnet) laser beam whose intensity was modulated by a Bragg cell. The normal component of the vibration was measured by a sensitive interferometric probe. Resonances of both modes have been observed in the range 100-1500 kHz. As predicted by the analysis of the mechanical displacement distribution on the surface, the Rayleigh wave resonances gave larger probe signals than the whispering gallery waves. The Q-factors were about 10 4. This observation technique of spherical resonances does not require any mechanical contact. It is concluded that this advantage could be used to evaluate the mechanical characteristics of free balls
Keywords :
Rayleigh waves; resonance; 100 to 1500 kHz; 20 nm; Bragg cell; Q-factors; Rayleigh wave resonances; YAG; YAl5O12; diameter; interferometric probe; laser beam; mechanical displacement distribution; normal component; steel sphere; surface waves resonance; vibration; whispering gallery waves; Aluminum; Garnets; Laser excitation; Laser modes; Probes; Resonance; Steel; Surface waves; Vibration measurement; Yttrium;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49396
