Optical methods for non-contact measurements of membranes |
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Authors: | S Roose Y Stockman P Rochus T Kuhn M Lang H Baier S Langlois G Casarosa |
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Institution: | aCentre Spatial de Liège, Université de Liège, Avenue du Pré-Aily, B-4031 Angleur-Liège, Belgium;bLehrstuhl für Leichtbau, Technische Universität München, Boltzmannstraße 15, D-85747 Garching b. München, Germany;cESTEC, European Space Agency, Keplerlaan 1, NL-2200 Noordwijk, The Netherlands;dAOES Group BV, Haagse Schouwweg 6G, NL- 2332KG Leiden, The Netherlands |
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Abstract: | Structures for space applications very often suffer stringent mass constraints. Lightweight structures are developed for this purpose, through the use of deployable and/or inflatable beams, and thin-film membranes. Their inherent properties (low mass and small thickness) preclude the use of conventional measurement methods (accelerometers and displacement transducers for example) during on-ground testing. In this context, innovative non-contact measurement methods need to be investigated for these stretched membranes.The object of the present project is to review existing measurement systems capable of measuring characteristics of membrane space-structures such as: dot-projection videogrammetry (static measurements), stereo-correlation (dynamic and static measurements), fringe projection (wrinkles) and 3D laser scanning vibrometry (dynamic measurements).Therefore, minimum requirements were given for the study in order to have representative test articles covering a wide range of applications. We present test results obtained with the different methods on our test articles. |
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