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Laser-probe analysis of field distributions within acoustic-surface-wave planar resonators

Laser-probe analysis of field distributions within acoustic-surface-wave planar resonators

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Transverse boundary conditions can exert a marked influence on internal field configurations within an acoustic-surface-wave planar resonator. Laser-probe plots of field distributions within two ostensibly similar piezoshorting resonators are reported. The results provide some insight into the eigenmode spectrum of both the resonator and the multistrip coupler. It is proposed that planar resonator drive transducer apodisation may be used to reduce overmoding.

References

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      • Li, R.C.M., Williamson, R.C., Flanders, D.C., Alusow, J.A.: `On the performance and limitations of the surface wave resonator using grooved reflectors', Proceedings of IEEE ultrasonics symposium, 1974, Milwaukee, p. 257–262.
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      • Lakin, K.M., Joseph, T., Penunuri, D.: `Planar surface acoustic-wave resonators', Proceedings of IEEE ultrasonics symposium, 1974, Milwaukee, p. 263–267.
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      • Mason, I.M., Chambers, J., Lagasse, P.E.: `Spatial harmonic analysis of the multistrip coupler', Proceedings of IEEE ultrasonics symposium, 1973, Monterey, p. 159–162.
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      • Ingebritsen, K.A.: `A normal mode representation of surface wave multistrip couplers', Proceedings of IEEE ultrasonics symposium, 1973, Monterey, p. 163–167.
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      • R.M. de la Rue , R.F. Humphryes , I.M. Mason , E.A. Ash . Acoustic-surface-wave amplitude and phase measurements using laser probe. Proc. IEE , 2 , 117 - 126
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