Knowledge of the mechanical behavior of materials at elevated temperatures is vital for the design of structural components in various fields such as aerospace, automotive, and nuclear engineering. It is desirable to visualize the response of the structure to applied loads under actual working conditions. Conventional invasive transducers such as strain gages, which provide local strain information, may not be reliable at extremely high temperatures. Optical noninvasive measurement techniques such as holography, speckle interferometry, and moire are attractive for material testing at high temperatures because they provide full field displacement and strain information.
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