Hybrid Stereocorrelation for 3D Thermomechanical Field Measurements

A. Charbal (1, 2) , J.-E. Dufour (2) , François Hild (2) , Stéphane Roux (2) , M. Poncelet (3) , L. Vincent (1)

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

Three dimensional displacement fields are measured thanks to an original stereo system made of InfraRed (IR) and visible light cameras. This configuration provides the thermal fields which drive the thermomechanical loading and the 3D surface displacement fields, i.e. the response of the studied material. The calibration of the stereo rig is performed by using a 3D target of known geometry and the large gray level variations that occur on the IR images are accounted for by applying a low-pass filter. Because of a slight disorientation of the target, a further calibration correction step revealed necessary. After correction of the target orientation, the measured displacement fields display a good qualitative agreement (no quantitative comparison has been performed yet) with the expected fields.

Mots clés: Stereocorrelation; hybrid system; IR and visible light cameras; calibration; gray level corrections

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

A. Charbal, J.-E. Dufour, François Hild, Stéphane Roux, M. Poncelet, et al.. Hybrid Stereocorrelation for 3D Thermomechanical Field Measurements. Advancement of Optical Methods in Experimental Mechanics vol.3, 3, pp.83-88, 2016. ⟨cea-02442317⟩