Fonctions de correction de la diffraction et solutions analytiques dans les mesures en acoustique non lineaire

摘要

This paper presents an analytical formulation for correcting the diffraction associated with the second harmonic of an acoustic wave that is more compact than that usually used. This new formulation, resulting from an approximation of the correction applied to fundamental, makes it possible to obtain simple solutions for the second harmonic of the average acoustic pressure but is sufficiently precise for measuring the parameter of nonlinearity B/A in a finite amplitude method. Comparison with other expressions requiring numerical integration show that the solutions are precise in the nearfield.