Three different types of metal had been used in these test series:
iron, copper and aluminium. These materials introduced
extreme problems because a lot of measurements could not be
carried out (no data recorded) – especially the orthogonal scans,
probably due to saturation effects caused by high energy
backscattered from the shiny surfaces. The sensitivity of this
laser scanner seems to be too high which may cause anomalous
effects (Pesci and Teza, 2008).