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  • 1
    ISSN: 1432-0630
    Keywords: 43.35.+d ; 43.85.+f ; 43.90.+v
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have observed, by a thermoacoustic method, the acoustic resonance vibration of small (diameter ∼ 115 Μm) piezoelectric particles in high frequency (∼15 MHz) electric fields. The frequency dependence of the thermoacoustic signal gives direct information about the size distribution of the particles. In very strong rf electric fields we also observed a rotation of the vibrating particles by large angles — as originally suggested by Melcher and Shiren [3] — orienting the initially random rf dipoles parallel to the rf electric fields. The observed strong forces acting on vibrating piezoelectric particles in rf fields can probably be used as a new method of selectively extracting particles of a given size from a broad distribution of very small particles.
    Type of Medium: Electronic Resource
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