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Optical Engineering

Digital holographic interferometry in the long-wave infrared and temporal phase unwrapping for measuring large deformations and rigid body motions of segmented space detector in cryogenic test
Author(s): Jean-François Vandenrijt; Cédric Thizy; Laurent Martin; Florent Beaumont; José Garcia; Christophe Fabron; Éric Prieto; Thierry Maciaszek; Marc P. Georges
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Paper Abstract

We present digital holographic interferometry (DHI) in the long-wave infrared for monitoring the deformation under cryogenic conditions of a segmented focal plane array to be used in a space mission. The long wavelength was chosen for its ability to allow measurement of displacements 20 times larger than DHI in the visible, which were foreseen with the test object under large temperature variations. The latter is a mosaic of 4×4 detectors assembled on a frame. DHI was required to assess the global deformation of the assembly, the deformation of each detector, and out-of-plane movements of each of them with respect to their neighbors. For that reason, we incorporated the temporal phase unwrapping by capturing a sufficiently high number of holograms between which the phase does not undergo large variations. At last, since the specimen exhibits specular reflectivity at that wavelength, it is illuminated by means of a reflective diffuser.

Paper Details

Date Published: 12 August 2016
PDF: 8 pages
Opt. Eng. 55(12) 121723 doi: 10.1117/1.OE.55.12.121723
Published in: Optical Engineering Volume 55, Issue 12
Show Author Affiliations
Jean-François Vandenrijt, Univ. de Liège, Ctr. Spatial de Liège (Belgium)
Cédric Thizy, Univ. de Liège, Ctr. Spatial de Liège (Belgium)
Laurent Martin, Lab. d'Astrophysique de Marseille (France)
Florent Beaumont, Lab. d'Astrophysique de Marseille (France)
José Garcia, Lab. d'Astrophysique de Marseille (France)
Christophe Fabron, Lab. d'Astrophysique de Marseille (France)
Éric Prieto, Lab. d'Astrophysique de Marseille (France)
Thierry Maciaszek, Lab. d'Astrophysique de Marseille (France)
Marc P. Georges, Univ. de Liège, Ctr. Spatial de Liège (Belgium)

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