Based on the Fenlon's theory the parametric effects in fluids due to the nonlinear interaction of a low frequency pumping wave and a high frequency probing wave are analysed. The expressions of pressure amplitude ...Based on the Fenlon's theory the parametric effects in fluids due to the nonlinear interaction of a low frequency pumping wave and a high frequency probing wave are analysed. The expressions of pressure amplitude of sum or difference frequency sideband and the formula of nonlinearity parameter B/A for lossy medium are derived. Theoretical calculation demonstrated, that the sideband components increase linearly with pump signal. Therefore, a method for determination of B/A is provided and the values for several biological fluids and mixtures are measured.展开更多
基金The project supported by National Natural Science Foundation of China
文摘Based on the Fenlon's theory the parametric effects in fluids due to the nonlinear interaction of a low frequency pumping wave and a high frequency probing wave are analysed. The expressions of pressure amplitude of sum or difference frequency sideband and the formula of nonlinearity parameter B/A for lossy medium are derived. Theoretical calculation demonstrated, that the sideband components increase linearly with pump signal. Therefore, a method for determination of B/A is provided and the values for several biological fluids and mixtures are measured.
