Ultramultiple roundtrips of surface acoustic wave on sphere realizing innovation of gas sensors

@article{Yamanaka2006UltramultipleRO,
  title={Ultramultiple roundtrips of surface acoustic wave on sphere realizing innovation of gas sensors},
  author={Kazushi Yamanaka and Satoru Ishikawa and Noritaka Nakaso and Nobuo Takeda and Dong Youn Sim and Tsuyoshi Mihara and A. Mizukami and Ichitaro Satoh and Shingo Akao and Y Tsukahara},
  journal={IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control},
  year={2006},
  volume={53},
  pages={793-801}
}
A thin beam of wave usually diverges due to diffraction, which is a limitation of any device using such waves. However, a surface acoustic wave (SAW) on a sphere with an appropriate aperture does not diverge but is naturally collimated, realizing ultramultiple roundtrips along an equator of the sphere. This effect is caused by the balance between diffraction and focusing on a spherical surface, and it enables realization of high-performance ball SAW sensors. The advantage of ball SAW is most… 

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