光ヘテロダイン法による円板状圧電振動子の振動速度分布測定

概要

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By using optical heterodyne technique, vertical vibration velocity distributions along radial direction in disk or bevelled disk transducers of Pb(Zr・Ti)O_3 are successfully measured together with their relative vibration phases referring to applied driving signals. They are essential to calculate their volume velocity or directional patterns. The experiment is carried out changing the diameter to thickness ratio from2to12. Their frequency spectra(frequency range:1-700kHz)are also measured to be compared with the vibration velocity distributions. The obtained velocity distributions and frequency spectra show that two groups of radial vibration coupling with the thickness extensional vibration obviously exist in disk vibrations. These two groups are analytically confirmed by finding out the corresponding boundary conditions. And the relations among the diameter to thickness ratio, frequency spectra and vibration modes of disk-type piezoelectric ceramic transducer are clarified.
社団法人日本音響学会の論文
1982-12-25