Non -destructive testing (NDT) of materials can be achieved via proper photonic excitation and radiometric monitoring of the induced thermal changes. The theoretical support for this photothermal conversion in bi-layered materials is proposed, single -pulse and periodically modulated fluxes being considered. Some practical proposals are derived concerning the various aims of NDT: coatings thickness measurements, detection of defective bondings or delaminations, measurements of contact resistances between two layers. Measurements performed with a commercially available infra -red scanner and a digital data acquisition and processing system are reported.

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Photothermal thermography is a nondestructive technique for the analysis and testing of materials which associates the excitation of the tested parts by a flash with the detection of the induced temperature increase, thanks to an infrared thermography camera.We present here an apparatus called MECIR, which results from a several year long collaboration between both a research laboratory of the University of Reims and an outstanding civilian and military aircraft constructor. It includes an AGEMA infrared camera, a specially conceived system for the image capture and the treatment of data, as well as an illuminator composed of four Xenon flash tubes. The apparatus is to be used for the rapid testing of rather flat and large parts.We show the results of defect controls in objects made of composite materials and used in the aeronautic industry. (*) The development of MECIR is being sponsored by the French Ministry for Research and Technology. SPIE Vol. 1320 Infrared Technology andApplications (1990) / 285 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx 69 65 60 SPIE Vol. 1320 Infrared Technology andApplications (1990) / 291 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Infrared thermography measurements of thin, semitransparent carbon foils under pulsed irradiation with 1.1 GeV uranium ions are presented. To convert the infrared signal into target temperature, the transmission and emissivity of carbon foils of various areal densities between 20 and 100 µg/cm2 were recorded. According to this calibration, a beam of 8x10 9 U-ions/cm 2 s leads to a temperature rise within a single ion pulse of 150 µs length of up to 350 C. This information is important for future simulations of beam induced damage processes occurring in high power targets.