Acoustic waves have a wide range of applications in modern .science. These are used as diagnostic tool in determining the mechanical parameters of fluids and solids. In addition, their application ranges from geophysics (seismic exploration techniques, bore-hole sounding) to quantitative nondestructive evaluation of mechanical structures, and acoustic tomography for medical purposes. Another important application is the problem of noise reduction. In case noise is radiated from aero-engines and or from inside wind tunnels, analysis of the acoustic diffrac-lion from absorbing planes in moving fluids is required. Rawlins [1] discussed time-harmonic diffraction of an acoustic line source by an absorbing half plane in the presence of a moving fluid and calculated the diffracted field. This analysis was further extended to a finite barrier by Asghar [2], Jones [3] considered a time harmonic line source parallel to a semi-infinite rigid plane in still air as well as in a moving inviscid fluid. It was further extended to a point source by Balasubramanyam [4], and to the diffraction of a cylindrical pulse by Rienstra [5].
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