Multiple scattering between a cylinder and a plane

Experimental measurements of the backscattering of a plane acoustic wave by a rigid cylinder parallel to a perfectly hard plate are compared with theoretical calculations. Two sets of calculations, one which includes the effects of multiple scattering between the cylinder and the plate and one which ignores these effects, were performed. The measurements were done in fresh water using a 2-in. diameter solid steel cylinder at various distances from a steel plate. The frequency of the incident wave was varied from 50 to 100 kHz. Comparisons between the theories and experiment were made both for the case of the cylinder in front of the plate and for the case of the cylinder behind the plate. The results confirm that multiple scattering effects should be included in these scattering calculations.