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 (invited paper)
digital holography; holographic interferometry; metrology; thermal (uncooled) infrared detectors; laser carbon dioxide; space instrumentation
Abstract :
[en] We present digital holographic interferometry in the long-wave infrared for monitoring the deformation under cryogenic conditions of a segmented focal plane array (FPA) 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 and 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 piston 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.
Thizy, Cédric ; Université de Liège > CSL (Centre Spatial de Liège)
Martin, Laurent; Laboratoire d'Astrophysique de Marseille
Beaumont, Florent; Laboratoire d'Astrophysique de Marseille
Garcia, José; Laboratoire d'Astrophysique de Marseille
Fabron, Christophe; Laboratoire d'Astrophysique de Marseille
Prieto, Eric; Laboratoire d'Astrophysique de Marseille
Maciaszek, Thierry; Laboratoire d'Astrophysique de Marseille
Georges, Marc ; Université de Liège > CSL (Centre Spatial de Liège)
Language :
English
Title :
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 (invited paper)
Publication date :
December 2016
Journal title :
Optical Engineering
ISSN :
0091-3286
eISSN :
1560-2303
Publisher :
International Society of Optical Engineering, Bellingham, United States - Washington
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