Analysis and correction of diffraction effect on the B/A measurement at high frequencies

作者：Zhang D^*; Gong XF; Liu XZ; Kushibiki J; Nishino H

来源：Chinese Physics Letters, 2004, 21(1): 107-109.

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.

• 出版日期2004-1
• 单位南京大学