Experimental study finds self-heating causes significant strain measurement errors in cameras, suggesting critical evaluation is needed.
The systematic strain measurement error in digital image correlation (DIC) induced by self-heating of digital CCD and CMOS cameras was extensively studied, and an experimental and data analysis procedure has been proposed and two parameters have been suggested to examine and evaluate this. Six digital cameras of four different types were tested to define the strain errors, and it was found that each camera needed between 1 and 2 h to reach a stable heat balance, with a measured temperature increase of around 10 ?C. During the temperature increase, the virtual image expansion will cause a 70?230 ?? strain error in the DIC measurement, which is large enough to be noticed in most DIC experiments and hence should be eliminated.
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Ma et al. (2012) studied this question.
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