On the excitation of a closely spaced array by a line source

An infinite row of periodically spaced, identical rigid circular cylinders is excited by an acoustic line source, which is parallel to the generators of the cylinders. A method for calculating the scattered field accurately and efficiently is presented. When the cylinders are sufficiently close together, Rayleigh–Bloch surface waves, which propagate energy to infinity along the array are excited. An expression is derived which enables the amplitudes of these surface waves to be computed without requiring the solution to the full scattering problem.