An Analysis of Methods Allowing Detection of Large Local Irregularities of Surface

Measurements of form deviations of 3D elements can be conducted with the use of various strategies, differing in a number and distribution of sampling points located on an investigated surface. Low number of sampling points or measured sections can lead to the situation that some surface irregularities are not detected by a measuring system. An application of higher density of sampling points, in turn, results in significant lengthening of measurement time, which is undesirable. This is the reason why authors propose a novel, adaptive measurement strategy consisting of two stages: a preliminary measurement and additional measurements. During the preliminary measurement an investigated area is scanned along preselected trajectory. If measurement results show that there is significant change of sensor readings in a certain fragment of an investigated surface, then we conduct additional measurements. In this paper authors present methods that can be used to localize areas where significant change of signal may occur.