Speaker
Description
Leading-edge diffraction and early scattering from finite-sized rigid, porous, and perforated plates under grazing incidence are investigated using dense planar measurements obtained with a moving-microphone array. A signal-subtraction approach is employed to isolate sample-induced contributions in the upstream region, where specular reflections are negligible and time-domain windowing is not applicable. The resulting diffraction-induced level distributions are analysed across multiple grazing angles. A rigid plate serves as a reference condition, enabling consistent characterization of the measured fields. The responses of porous and perforated samples are evaluated both independently and relative to this reference, allowing systematic identification of material-dependent modifications in the early diffraction field. The proposed approach provides a controlled framework for assessing edge-dominated scattering from finite-sized samples under grazing-incidence conditions.