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Proceedings Paper

ESPI deformation measurement on lightweight structures under thermal load
Author(s): Erwin K. Hack; Rolf Broennimann
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Paper Abstract

We report on the application of ESPI to measure deformations induced by thermal load on lightweight honeycomb panels for space applications. The panel was mounted isostatically onto a vibration isolated table. A housing for temperature stabilization was constructed enclosing the panel, heating elements, fans and the ESPI-head made of Invar. Emphasis is put on the quantitative analysis of the deformation of this large object (0.8 X 0.8 m2) viewed from a relatively short distance of 1.1 m and illuminated sequentially from three non-orthogonal directions. Influences of laser stability, rigid body displacements, temperature inhomogeneities as well as possible deformations of the measurement head are discussed in order to derive the measurement uncertainty and to estimate corrections. Beside the sensitivity vector analysis it is important to take into account the optical light path changes due to temperature changes. Out of plane deformation fields of the panel are presented.

Paper Details

Date Published: 29 September 1998
PDF: 6 pages
Proc. SPIE 3407, International Conference on Applied Optical Metrology, (29 September 1998); doi: 10.1117/12.323333
Show Author Affiliations
Erwin K. Hack, Swiss Federal Labs. for Materials Testing and Research (Switzerland)
Rolf Broennimann, Swiss Federal Labs. for Materials Testing and Research (Switzerland)

Published in SPIE Proceedings Vol. 3407:
International Conference on Applied Optical Metrology
Pramod Kumar Rastogi; Ferenc Gyimesi, Editor(s)

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