Inverse Radiation Problem with Infrared Images to Monitor Plasma-Facing Components Temperature in Metallic Fusion Devices

Charly Talatizi (1) , Marie-Hélène Aumeunier (1) , Fabrice Rigollet (2) , Mickael Le Bohec (2) , Jonathan Gérardin (2) , Jonathan Gaspar (2) , Christophe Le Niliot (2) , Albrecht Herrmann

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 IUSTI - Institut universitaire des systèmes thermiques industriels

Infrared (IR) diagnostics are used to measure plasma-facing components (PFC) surface temperature in fusion devices. However, the interpretation of such images is complex in all-reflective environments because of unknown emissivity and multiple reflections issues. In order to assess these challenges an iterative inversion method based on a fast photonic model, the radiosity method, has been developed. The radiosity method is based on strong hypotheses including all diffuse surfaces. The inversion method allows retrieving the true surface temperature of PFC in two steps: a step of the target emissivity estimation in a baking scene and the use of the emissivity map to retrieve the temperature of metallic components with errors up to 3% during a plasma scenario.

Mots clés: infrared thermography; emissivity; reflections; Ray Tracing Monte Carlo; Radiosity method; inverse problem

Domaines: Physique [physics]

Charly Talatizi, Marie-Hélène Aumeunier, Fabrice Rigollet, Mickael Le Bohec, Jonathan Gérardin, et al.. Inverse Radiation Problem with Infrared Images to Monitor Plasma-Facing Components Temperature in Metallic Fusion Devices. Fusion Engineering and Design, 2020. ⟨hal-03189069⟩