| 摘 要： | Based on the Fenlon‘s theory the parametric effects in fluids due to the nonlinear interaction of a lowfrequency pumping wave and a high frequency probing wave are analysed.The expressions of pressureamplitude of sum or difference frequency sideband and the fromula of nonlinearity parameter B/A forlossy medium are derived.Theoretical calculation demonstrated,that the sideband componentsincrease linearly with pump signal.Therefore,a method for determination of B/A is provided and the val-ues for several biological fluids and mixtures are measured.
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