Recent developments in large-scale dimensional metrology

Abstract

With ever-more demanding requirements for the accurate manufacture of large components, dimensional measuring techniques are becoming progressively more sophisticated. This review describes some of the more recently developed techniques and the state-of-the-art in the more well-known large-scale dimensional metrology methods. In some cases, the techniques are described in detail, or, where relevant specialist review papers exist, these are cited as further reading. The traceability of the measurement data collected is discussed with reference to new international standards that are emerging. In some cases, hybrid measurement techniques are finding specialized applications and these are referred to where appropriate.

The Mobile Spatial coordinate Measuring System II (MScMS-II): system description and preliminary assessment of the measurement uncertainty

“…In general, the so called collinearity equations derive from equation (3). These equations are the basis of photogrammetry theory and originate from the perspective projection of a point in the 3D space onto a given camera viewing plane [6,7]:…”

“…Various approaches are suggested in scientific literature according to the different problems at hand [3,6,7]. An alternative approach to MLPU could be based on Monte Carlo Sampling technique which has the potential advantage of being independent of linearization [3].…”

“…For example, the German guideline VDI/VDE 2634 [12] recommends the use of specific calibrated scale bars that can be employed to determine ISO conformant length measuring errors [3].…”

“…Different technologies, working principles, functionalities and architectures have been implemented, in order to fulfil the requirements of the several industrial sectors involved [2,3].…”

Large-scale dimensional metrology (LSDM): from tapes and theodolites to multi-sensor systems

“…Last decades has shown a great deal of applications of LSDM, involving different arenas of technology, ranging from civil and industrial architecture to aerospace engineering. [1][2][3][4][5][6][7][8][9] Typical applications refer to the measurement of large machines and structures, such as for example in the aeronautic and shipbuilder industry, but also in the field of topographical and architectural surveying. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] A branch of application, which is often neglected by the scientific literature when referring to LSDM, concerns the tracking of objects in movement in large spaces, such as for examples warehouses or industrial plants, or even over the territory.…”