ESPI deformation measurement on lightweight structures under thermal load

Erwin K. Hack; Rolf Broennimann

doi:10.1117/12.323333

29 September 1998 ESPI deformation measurement on lightweight structures under thermal load

Erwin K. Hack, Rolf Broennimann

Proceedings Volume 3407, International Conference on Applied Optical Metrology; (1998) https://doi.org/10.1117/12.323333
Event: International Conference on Applied Optical Metrology, 1998, Balatonfured, Hungary

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.

Citation Download Citation

Erwin K. Hack and Rolf Broennimann "ESPI deformation measurement on lightweight structures under thermal load", Proc. SPIE 3407, International Conference on Applied Optical Metrology, (29 September 1998); https://doi.org/10.1117/12.323333

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