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Analysis and Correction of Diffraction Effect on the B/A Measurement at High Frequencies |
| ZHANG Dong1;GONG Xiu-Fen1;LIU Xiao-Zhou1;KUSHIBIKI Jun-ichi2;NISHINO Hideo2 |
| 1State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093
2Department of Electrical Engineering, Tohoku University, Sendai 980-8579, Japan |
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| Cite this article: |
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ZHANG Dong, GONG Xiu-Fen, LIU Xiao-Zhou et al 2004 Chin. Phys. Lett. 21 107-109 |
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Abstract A numerical method is developed to analyse and to correct the diffraction effect in the measurement of acoustic nonlinearity parameter B/A at high frequencies. By using the KZK nonlinear equation and the superposition approach of Gaussian beams, an analytical model is derived to describe the second harmonic generation through multi-layer medium SiO2/liquid specimen/SiO2. Frequency dependence of the nonlinear characterization curve for water in 110-155 MHz is numerically and experimentally investigated. With the measured dip position and the new model, values of B/A for water are evaluated. The results show that the present method can effectively correct the diffraction effect in the measurement.
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| Keywords:
43.25.+y
43.35.+d
43.80.+p
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Published: 01 January 2004
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| PACS: |
43.25.+y
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(Nonlinear acoustics)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.80.+p
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(Bioacoustics)
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