Global digital image correlation up to very high temperatures with grey level corrections

The characterisation of high temperature materials for extreme environment implies experimental challenges. Displacement measurements using digital image correlation (DIC) have proven to be an efficient non-contact method even at high temperatures. This paper uses global DIC and grey level corrections to analyse very high temperature tests in which inversion of the grey level distribution may occur. The benefits of grey level corrections are shown on a coated ceramic matrix composite heated up to 1380 °C. The inversion of the grey level distribution is then accounted for to study various ceramics subjected to temperatures up to 1860 °C.