Reverberation-chamber measurement of angle-dependent surface impedance

Conventional impedance-tube and reverberation-chamber methods for characterizing acoustic materials provide only normal- or diffuse-incidence sound absorption data. This limitation reduces their applicability under realistic room-acoustic conditions and motivates the development of directional characterization methods. In this work, a reverberation-chamber-based framework is presented for determining the angle-dependent surface impedance of an absorbing sample. The technique reconstructs the sou