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Proceedings Paper

Speckle interferometry at 10 micrometers wavelength: a combined thermography and interferometry technique and its application in aeronautical nondestructive testing
Author(s): Marc P. Georges; Jean-François Vandenrijt; Cédric Thizy; Igor Alexeenko; Giancarlo Pedrini; Jonathan Rochet; Birgit Vollheim; Iagoba Jorge; Ion López; Wolfgang Osten
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Paper Abstract

Speckle interferometry with CO2 laser (10 micrometers) and microbolometer array has been developed and the final outcome is a mobile interferometer. The long wavelength allows to measure large deformations and is well immune against external perturbations, so as it can be used in field conditions. The technique is based on specklegram recording on the microbolometer array. The background of the specklegram is constituted by the thermal image of the object. Consequently the technique allows simultaneous observation of deformation and temperature difference when an object undergoes a given stress. We show several applications in aerospace nondestructive testing.

Paper Details

Date Published: 18 August 2014
PDF: 8 pages
Proc. SPIE 9204, Interferometry XVII: Advanced Applications, 92040F (18 August 2014); doi: 10.1117/12.2062816
Show Author Affiliations
Marc P. Georges, Univ. de Liège (Belgium)
Jean-François Vandenrijt, Univ. de Liège (Belgium)
Cédric Thizy, Univ. de Liège (Belgium)
Igor Alexeenko, Univ. Stuttgart (Germany)
Giancarlo Pedrini, Univ. Stuttgart (Germany)
Jonathan Rochet, OPTRION SA (Belgium)
Birgit Vollheim, InfraTec GmbH (Germany)
Iagoba Jorge, Fundación Ctr. de Tecnologías Aeronáuticas (Spain)
Ion López, Fundación Ctr. de Tecnologías Aeronáuticas (Spain)
Wolfgang Osten, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 9204:
Interferometry XVII: Advanced Applications
Cosme Furlong; Christophe Gorecki; Peter J. de Groot; Erik L. Novak, Editor(s)

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