Analysis and Correction of Diffraction Effect on the B/A Measurement at High Frequencies |
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作者姓名: | 章东 龚秀芬 刘晓宙 KUSHIBIKIJun-ichi NISHINOHideo |
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作者单位: | [1]StateKeyLaboratoryofModernAcoustics,InstituteofAcoustics,NanjingUniversity,Nanjing210093 [2]DepartmentofElectricedEngineering,TohokuUniversity,Sendal980-8579,Japan |
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摘 要: | 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 modal, 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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关 键 词: | 衍射作用 高频测量 非线性声学参数 KZK非线性方程 |
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