Aladin H. Kamel Acoustic diffraction by an impedance wedge (319K, pdf) ABSTRACT. We consider the boundary-value problem for the Helmholtz equation connected with an infinite wedge with an impedance boundary on its face. The scheme of solution includes applying the Kontorovich-Lebedev (KL) transform, derivation of an integral equation satisfied by the KL spectral amplitude and obtaining near and far field representations together with the conditions of validity of these representations.