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Photo thermal radiometry method development and application for nuclear technologies

Abstract : In the search for new materials for nuclear industry and reliable nuclear safe technologies, much attention is given to methods for non-destructive remote testing and control of materials in severe environment of nuclear installations. Photo thermal radiometry, as one of these possible methods, is under development in the CEA (French Atomic Energy Commission). In our studies, it was used with repetition rate laser heating of a sample by either a pulsed (100 ns-1 ms, 1-10000 Hz) [1, 2] or a sinusoidal modulated laser power (1 Hz - 1 MHz) [2,3] followed by measurements of the thermal radiation emitted by the sample under study. Thermal radiation time-dependence or phase shifts between the laser power and the thermal radiation measured at different modulated frequencies (lock-in radiometry) were then compared with those obtained with a model of laser heating to characterize some sample properties (thermal diffusivity, thickness, layer adhesion, under-surface defects and their changes in time). Samples from European TOKAMAKS (graphite or carbon fibre composite protective tiles with 1 - 100 µm deposits) and nuclear installations (metal pieces, Zircaloy cladding, micrometric oxide layers or PVD thin films, 3D-printed metal objects) were tested and characterized with the home-made experimental setups and the developed analytical (3D+t) models of laser heating [4-6]. The numerical simulation of laser heating was used to fit the calculated thermal radiation or phase shifts with the experimental ones by adjusting the material properties. This method of characterization was validated with a set of etalon samples. The applied methods will be presented along with the obtained results. The possible ways to improve the method to widen the scope of its application in the nuclear industry will be discussed as well.
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https://hal-cea.archives-ouvertes.fr/cea-03412003
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Submitted on : Tuesday, November 2, 2021 - 5:00:20 PM
Last modification on : Monday, November 29, 2021 - 2:20:01 PM

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  • HAL Id : cea-03412003, version 1

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Alexandre Semerok, Sergey V. Fomichev, Christian Grisolia, Sang Pham Tu Quoc, Antonin Poisson, et al.. Photo thermal radiometry method development and application for nuclear technologies. 20th International Conference on Photoacoustic and Photothermal Phenomena (ICPPP 20), Jul 2019, Moscou, Russia. ⟨cea-03412003⟩

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