Regularized InfraRed Image Correlation Applied to Laser-Induced Thermal Shocks

A. Charbal (1) , F. Hild (2) , L. Vincent (1) , S. Roux (2)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
2 LMT - Laboratoire de Mécanique et Technologie

The thermomechanical behavior of a stainless steel undergoing thermal shocks is investigated with an infrared (IR) camera. The temperature and kinematic fields are determined simultaneously exploiting only IR frames. The thermal loading is imposed with a laser, which gives rise to very high local digital level variations. This effect is addressed thanks to a regularized infrared image correlation (R-IRIC) technique, which accounts for brightness and contrast variations. The resulting digital level residuals are reduced from 54% down to less than 1% of the dynamic range.

Keywords: Corrélation d'images numériques; infrarouge; Laser; Fatigue thermique

Domains: Physics [physics]; Nuclear Experiment [nucl-ex]; Physics [physics]; Nuclear Theory [nucl-th]

A. Charbal, F. Hild, L. Vincent, S. Roux. Regularized InfraRed Image Correlation Applied to Laser-Induced Thermal Shocks. QIRT 2016 - Quantitative InfraRed Thermography, Jul 2016, Gdansk, Poland. ⟨hal-02445730⟩