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Critical imaging parameters in time resolved digital image correlation (TRDIC): effect of optical blur during drop test on composite structures

Ahmed Boukar 1 Patrick Ienny 1 Stéphane Corn 1 Pierre Slangen 2
1 DMS - Durabilité des éco-Matériaux et Structures
LMGC - Laboratoire de Mécanique et Génie Civil, IMT - MINES ALES - IMT - MINES ALES
Abstract : High speed imaging is applied for drop test on composite samples. The effect of optical blur on image correlation accuracy is described. Blur magnitude is tuned by decreasing the exposure time (at constant sensor sensitivity) for the same drop test series on flyspecked composite plates, while focus, aperture and 1:1 magnification are kept constant. Frame rate (80-20kfps) and lighting are changed while keeping the same image contrast. Results show correlation quality is already altered with subpixel blur. This study enables to define blur criterion in high-speed imaging and completes study about sampling rate effect in time resolved image correlation by high-speed imaging.
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https://hal.mines-ales.fr/hal-03248381
Contributor : Pierre Slangen Connect in order to contact the contributor
Submitted on : Thursday, June 3, 2021 - 3:25:39 PM
Last modification on : Friday, October 22, 2021 - 2:38:02 PM
Long-term archiving on: : Saturday, September 4, 2021 - 6:55:57 PM

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Ahmed Boukar, Patrick Ienny, Stéphane Corn, Pierre Slangen. Critical imaging parameters in time resolved digital image correlation (TRDIC): effect of optical blur during drop test on composite structures. SPIE Optical Metrology, SPIE, Jun 2021, Munich, Germany. ⟨10.1117/12.2593708⟩. ⟨hal-03248381⟩

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