Speckle interferometry at 10 micrometers wavelength: a combined thermography and interferometry technique and its application in aeronautical nondestructive testing

Marc P. Georges; Jean-François Vandenrijt; Cédric Thizy; Igor Alexeenko; Giancarlo Pedrini; Jonathan Rochet; Birgit Vollheim; Iagoba Jorge; Ion López; Wolfgang Osten

doi:10.1117/12.2062816

18 August 2014 Speckle interferometry at 10 micrometers wavelength: a combined thermography and interferometry technique and its application in aeronautical nondestructive testing

Marc P. Georges, Jean-François Vandenrijt, Cédric Thizy, Igor Alexeenko, Giancarlo Pedrini, Jonathan Rochet, Birgit Vollheim, Iagoba Jorge, Ion López, Wolfgang Osten

Author Affiliations +

Proceedings Volume 9204, Interferometry XVII: Advanced Applications; 92040F (2014) https://doi.org/10.1117/12.2062816
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

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Marc P. Georges, Jean-François Vandenrijt, Cédric Thizy, Igor Alexeenko, Giancarlo Pedrini, Jonathan Rochet, Birgit Vollheim, Iagoba Jorge, Ion López, and Wolfgang Osten "Speckle interferometry at 10 micrometers wavelength: a combined thermography and interferometry technique and its application in aeronautical nondestructive testing", Proc. SPIE 9204, Interferometry XVII: Advanced Applications, 92040F (18 August 2014); https://doi.org/10.1117/12.2062816

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