Preliminary investigation of nonlinear dual frequency mixing technique for the estimation of the nonlinear parameter B / A

The nonlinear parameter B/A, better know as the Beyer parameter, is a measure of the nonlinearity between variations of the pressure and density. Because of these variation propagating wave is distorted. Media with the different Beyer parameter, will distort wave differently. In our work we are trying to measure this distortion, which will allow us to calculate the Beyer parameter. For this we used a dual frequency probe, that radiated pressure at /lf = 800 kHz and /hf = 5 MHz. LF pressure had high amplitude, to modulate the media parameters, while HF pressure had low amplitude and was used for measurements.