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.