Pushing the Boundaries of Accuracy: Development and Calibration of an Imperfection Measuring Rig

It is well understood that the buckling response of steel members can be significantly affected by their initial geometric imperfections. Therefore, it paramount importance these imperfections are accurately measured and subsequently accounted for when studying behaviour members. This paper discusses design, development calibration an imperfection measuring rig. The set-up makes use a laser displacement sensor which moved two electric motors along orthogonal high-precision guiding bars able to record out-of-plane over length 3 m. accuracy readings, although very reasonable quality, was found limited out-of-straightness moved. However, novel technique, where system calibrated against liquid surface, raise performance rig unprecedented accuracy. technique easy implement inexpensive. process, as analysis repeatability results estimate magnitude error, presented in this paper.