“…Carryingout also acoustic measurements in such facilities still remains a challenge yet, in particular due to unfavorable signal-to-noise ratios and to acoustic reflections in the test section. Given the interest of performing reliable acoustic measurements in aerodynamic wind tunnels, many efforts have been made for years to reduce the background noise in closed test sections 1, 2, 3 , to improve inflow acoustic measurements 4,5 and to develop data dereverberation techniques 6,7,8 . In particular, beamforming techniques based on the free-field Green's function may be able to provide noise source levels in reverberating test sections 9,10,11,12 .…”