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Compressional waves generated by thickness shear resonators in a surrounding gas

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3 Author(s)
Portnoff, G. ; Quartz Pro, Jarfalla, Sweden ; Mecea, V. ; Lindberg, L.

Compressional waves are generated by thickness shear mode resonators in a surrounding gas. They are not generated by a longitudinal movement of the quartz resonator, but originate in the shear velocity gradient on the surface of the resonator. Compressional waves are revealed by producing standing waves in a gap between the surface of the quartz resonator and a linearly moved parallel reflector. Whenever the gap length is an integer of half-wavelengths of the compressional waves, at the shear frequency of the resonator, periodic perturbations in motional resistance and frequency are recorded. The effect is important for precision resonators

Published in:

Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.

Date of Conference:

5-7 Jun 1996