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Reflected Beam Displacements of a Slightly Divergent Ultrasonic Gaussian Beam on a Water-Glass Interface Near Rayleigh Angle Incidence |
| ZHU Guo-zhen;LIU Liang;FU De-yong |
| Department of Physics, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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ZHU Guo-zhen, LIU Liang, FU De-yong 1999 Chin. Phys. Lett. 16 819-821 |
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Abstract Two reflected beams of a slightly divergent ultrasonic Gaussian beam on a water-glass interface are observed and recorded by a Schlieren system. The lateral displacements of the two reflected beams are measured for incident angle θi in a wide range of 10° around the Rayleigh angle θc. The displacements decrease as the incident angle increases, which is different from the previous predictions for bounded plane-wave beams, where the displacements have extremum at the Rayleigh angle θc.The explanation is based on the fact that the Gaussian beam generated by an ultrasonic transducer with a button (or strip) back electrode is actually slightly divergent. We extend Bertoni and Tamir's theory (Appl. Phys. 2 (1973) 157) to this case, and our calculated curves of the displacements against the incident angle are in agreement with the experimental results for |θi - θc| < 2°.
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| Keywords:
43.35.+d
43.20.+g
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Published: 01 November 1999
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| PACS: |
43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.20.+g
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(General linear acoustics)
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