Surface topography measurement of double-curved propeller blades using projected fringes

Abstract

This paper studies application of the method of projected fringes on measurement of the surface topography of double-curved propeller blades, produced in liquid metal, i.e. NiAl-bronze, with surface areas of about one square meter. The measurements are performed inside a grinding hall of a propeller factory. To meet the challenges encountered in such a demanding environment, it is important to keep the equipment as simple and robust as possible. Therefore, a method is developed for locating the fringe positions with sub-pixel accuracy. To avoid the need for a physical reference plane of sufficient area, a method of extrapolating the fringes projected on a small reference plane is applied. The method has been tested on a grinded propeller blade and the results agree very well compared to a standard manual measurement method

Online dimensional control of rolled steel profiles using projected fringes

“…Projected fringes are a full-field method for mapping the topography of surfaces [1][2][3][4][5][6][7][8][9][10][11][12][13]. It consists of imaging the fringes projected onto the surface with subsequent processing of the fringe data.…”

Dynamic Behavior and Deposit Features of Debris Avalanche in Model Tests Using High Speed Photogrammetry

“…The projected fringe method documents transient states as contour lines generated by projecting horizontal lines on the inclined plane and relates the deformation of the lines to surface elevation. The projected fringe technique can be used for the mapping of surface topography and measurement of surface deformations [17]. For example, it can be used for measuring the evolution of avalanches from their initiation to their deposit [18].…”