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Diffraction-free surface acoustic waves (SAWs) can be generated on a solid sphere and be propagated around the sphere in many turns without spreading if the source width is a geometrical mean of the diameter of the sphere and the wave length of SAWs. A tiny change in the surface elastic properties causes a large variation in the SAW propagation because of the long propagation distance around the sphere in many turns. Depositing a thin sensitive film on the sphere realizes a small ball SAW sensor with a rapid response and a high sensitivity.

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