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