Abstract
We present the results of studying the vibrational velocity distribution over the surface of cylindrical ultrasound transducers by acoustic holography. We describe two approaches for acoustic holography: the spatial spectrum method and the Rayleigh integral method. In the case of cylindrical sources the spectral method has a specific feature in comparison to the case of quasi-plane sources: small-scale spectrum components having the form of evanescent (nonpropagating) waves near the source, turn into propagating waves at a certain distance from the source. The use of such a mixed type of waves makes it possible to increase the holographic resolution. To conduct holography of cylindrical sources by the Rayleigh integral method, a modification consisting in the superimposing of boundaries on the integration region is proposed. We present the results of numerical simulation and physical experiments on holography of small cylindrical piezoelectric transducers. We demonstrate that the proposed methods of holography make it possible to recover the vibration structure of source surfaces up to order of the wavelength scales.
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Original Russian Text © S.A. Tsysar, Y.D. Sinelnikov, O.A. Sapozhnikov, 2011, published in Akusticheskiĭ Zhurnal, 2011, Vol. 57, No. 1, pp. 104–116.
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Tsysar, S.A., Sinelnikov, Y.D. & Sapozhnikov, O.A. Characterization of cylindrical ultrasonic transducers using acoustic holography. Acoust. Phys. 57, 94–105 (2011). https://doi.org/10.1134/S1063771011010167
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DOI: https://doi.org/10.1134/S1063771011010167