Determination of the acoustic nonlinearity parameter B/A from phase measurements

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Abstract
A technique for measurement of the acoustic nonlinearity parameterB/A in liquids is presented, along with results for several liquids. The nonlinearity parameter is determined by measuring changes in the travel time of ultrasonic tone bursts which are caused by prescribed changes in the ambient pressure. The travel time differences are measured by comparing the phase of the tone burst with that of a reference signal. The measurement is simpler to perform than those previously reported in the literature.

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