凹面で受波された集束超音波を用いる音響非線形パラメータの測定

概要

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The measurement method for the acoustic nonlinearity parameter B/A of a liquid sample inserted in the focal region has been presented, where the acoustic wave of focused Gaussian beam observed with a concave receiver which is set perpendicular to the acoustic axis within the postfocal region is utilized. Both the amplitudes and phase difference of the fundamental and second harmonic components in the signal detected with a concave receiver set at the position, where the obtained signal amplitude attains the maximum for each the case with and without insertion of the sample, are transformed to the values expected for the axial pressure at the range corresponding to the maximum position for the case with the insertion of the sample. Then the previously presented method utilizing the axial pressure turns out to be applicable. Using a 1. 9-MHz focusing source and a concave receiver, the confirmation of validity of the present method was intended through the experiment employing the samples of alcohol and glycerin. The result verified the capability of the present method to measure the B/A.
社団法人日本音響学会の論文