Journal Of The Acoustical Society Of America
An isentropic phase method is described for measuringin vitro the acoustic nonlinearity parameterB/A of several aqueous buffers, protein solutions, lipid oils, and emulsions. The technique relies upon the use of an acoustic interferometer to measure the small changes in sound speed that accompany a rapid hydrostaticpressure change of between one and two atmospheres. Average accuracies of 0.85% are attainable with this method.
E. Carr Everbach and R. E. Apfel.
"An interferometric technique for B/A measurement".
Journal Of The Acoustical Society Of America.