On the analysis of heat haze effects with spacetime DIC

Myriam Berny (1) , Thibaut Archer (1) , Anne Mavel (2) , Pierre Beauchêne (2) , Stéphane Roux (1) , François Hild (1)

1 LMT - Laboratoire de Mécanique et Technologie
2 ONERA - The French Aerospace Lab [Châtillon]

Long image series (i.e., movies) can be analyzed via digital image correlation (DIC) techniques. A new spacetime implementation is introduced to extend instantaneous DIC with minimal implementation complexity. With this procedure, a denoised reference image is built considering a series of more than 200 images. Such spacetime approach is very interesting when high temperature experiments are performed since it provides a very effective temporal regularization. The analysis of heat haze effects is carried out on a thermomechanical test in which the sample made of ceramic matrix composite is subjected to temperatures greater than 1,200°C in the heat affected zone of the laser beam. It is shown that the addition of a small fan reduces the spurious displacement fluctuations.

Mots clés: Heat haze; Denoising; Global DIC; Spatiotemporal regularization; High temperature test

Domaines: Mécanique des matériaux [physics.class-ph]

Myriam Berny, Thibaut Archer, Anne Mavel, Pierre Beauchêne, Stéphane Roux, et al.. On the analysis of heat haze effects with spacetime DIC. Optics and Lasers in Engineering, 2018, 111, pp.135-153. ⟨10.1016/j.optlaseng.2018.06.004⟩. ⟨hal-01809213⟩