Determination of Roughness Angles of Surfaces Using Laser Scanners

Today, terrestrial laser scanners help us to provide 3D geometry of object fast and high accuracy. Terrestrial laser scanners are faster to other methods for obtaining 3D geometry of the object and terrestrial laser scanners have more accurate result to other techniques. Laser scanners are used in this study because of these features. In this study, it is aimed to measure and define mathematically the roughness degree of the surfaces of rock pieces that are obtained as the result of under load test. To achieve this aim; Nextengine 3D Desktop Laser Scanner was used in this study because of low cost scanning system which provides high precision with fast measuring ability. It is a triangulation based scanner. Matlab also used in this study for all mathematical processing. The objects that were used in this study are two pieces of a rock which was broken under load test. Each piece of rock was scanned with Nextengine 3D Desktop Laser Scanner. Surface models were created using triangulated irregular network for each surface. New points and Opposed Cross sections were created on these surfaces. For each cross section curve equations were generated by using Matlab Curve Fitting Toolbox. After fitting, slopes for certain intervals were calculated on these curves. Roughness angles were calculated from these slope values. After all these steps; maximum, minimum and average values of negative and positive angles were calculated and roughness degree of the surfaces of rock pieces was determined.