
Proceedings Paper
Holographic Interferometry based on photorefractive crystal to measure 3D thermo-elastic distortion of composite structures and comparison with finite element modelsFormat | Member Price | Non-Member Price |
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Paper Abstract
Thermo-elastic distortions of composite structures have been measured by a holographic camera using a BSO
photorefractive crystal as the recording medium. The first test campaign (Phase 1) was performed on CFRP struts with
titanium end-fittings glued to the tips of the strut. The samples were placed in a vacuum chamber. The holographic
camera was located outside the chamber and configured with two illuminations to measure the relative out-of-plane and
in-plane (in one direction) displacements. The second test campaign (Phase 2) was performed on a structure composed of
a large Silicon Carbide base plate supported by 3 GFRP struts with glued Titanium end-fittings. Thermo-elastic
distortions have been measured with the same holographic camera used in phase 1, but four illuminations, instead of two,
have been used to provide the three components of displacement. This technique was specially developed and validated
during the phase 2 in CSL laboratory. The system has been designed to measure an object size of typically 250x250
mm2; the measurement range is such that the sum of the largest relative displacements in the three measurement
directions is maximum 20 μm. The validation of the four-illuminations technique led to measurement uncertainties of 120 nm for the relative in-plane and out-of-plane displacements, 230 nm for the absolute in-plane displacement and 400 nm for the absolute out-of-plane displacement. For both campaigns, the test results have been compared to the predictions obtained by finite element analyses and the correlation of these results was good.
Paper Details
Date Published: 13 May 2013
PDF: 12 pages
Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 878807 (13 May 2013); doi: 10.1117/12.2020542
Published in SPIE Proceedings Vol. 8788:
Optical Measurement Systems for Industrial Inspection VIII
Peter H. Lehmann; Wolfgang Osten; Armando Albertazzi, Editor(s)
PDF: 12 pages
Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 878807 (13 May 2013); doi: 10.1117/12.2020542
Show Author Affiliations
C. Thizy, Univ. de Liège (Belgium)
F. Eliot, EADS-Astrium (France)
D. Ballhause, EADS-Astrium (Germany)
K. R. Olympio, EADS-Astrium (Germany)
R. Kluge, EADS-Astrium (Germany)
F. Eliot, EADS-Astrium (France)
D. Ballhause, EADS-Astrium (Germany)
K. R. Olympio, EADS-Astrium (Germany)
R. Kluge, EADS-Astrium (Germany)
A. Shannon, European Space Agency ESTEC (Netherlands)
G. Laduree, European Space Agency ESTEC (Netherlands)
D. Logut, EADS-Astrium (France)
M. P. Georges, Univ. de Liège (Belgium)
G. Laduree, European Space Agency ESTEC (Netherlands)
D. Logut, EADS-Astrium (France)
M. P. Georges, Univ. de Liège (Belgium)
Published in SPIE Proceedings Vol. 8788:
Optical Measurement Systems for Industrial Inspection VIII
Peter H. Lehmann; Wolfgang Osten; Armando Albertazzi, Editor(s)
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