Abstract
IT is well known that a piezo-electric quartz plate can be excited into strong oscillations at its fundamental frequency, mainly determined by its thickness, or at any of its odd multiples, the even multiples being ruled out on theoretical considerations1. Parthasarathy2 first observed that a quartz plate can vibrate at its 5/2 and 7/2 harmonics. Afterwards, Parthasarathy, Pande and Pancholy3 showed that an X-cut quartz plate could also be made to oscillate, though with a lower intensity, at its even harmonics and such frequencies as ½, 3/2, 5/2, etc., of its fundamentals. This observation was later confirmed by Tsien and Chu4 and Özdogan5. The former also reported that, besides the even and half of odd multiples of the fundamental frequency, the plate would oscillate continuously, though with less intensity, at any intermediate frequency.
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References
Bergmann, L., “Der Ultraschall”, 61 (Hirzel Verlag, Zurich, 1949).
Parthasarathy, S., Proc. Ind. Acad. Sci., A, 3, 297 (1936).
Parthasarathy, S., Pande, A., and Pancholy, M., J. Sci. Ind. Res., 2, 295 (1944).
Tsien, L. C., and Chu, H. C., Nature, 156, 424 (1945).
Özdogan, I., Revue de la Faculté des Sciences de l'Université d'Istambul, A., 12 (2) 53 (1947).
Cady, W. G., “Piezoelectricity”, 309 (1946).
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PARTHASARATHY, S., PANCHOLY, M. & CHHAPGAR, A. Piezo-electric Oscillations of Quartz Plates at Even and Half-odd Harmonics. Nature 171, 216–217 (1953). https://doi.org/10.1038/171216a0
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DOI: https://doi.org/10.1038/171216a0
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