Single-transmitter setup on nonlinear mixing to measure acoustic nonlinearity of first order

In this study, the acoustic nonlinearity of water was investigated using a variation of the collinear wave mixing method. One single transducer, driven at two different frequencies f_a and f_b, was used to generate a third frequency component at f_a - f_b, f_a + f_b, 2f_a and 2f_b. Such a configuration allows to cancel out system nonlinearities since no amplification of the signal beyond 10V is needed. Perturbation solutions of nonlinear parameter in water are analytically calculated and validated with experimental measurements.