Abstract
A new technique for measuring strain at temperatures from room temperature to at least 3000K (4940 °F) has been developed and evaluated. The system was developed for measuring strain during studies of the short time (seconds to minutes), high temperature mechanical properties of materials heated by self-resistance, but it has general applicability. The technique consists of optically tracking two small ceramic cement nodules on the specimen with a digital line scan camera. The nodules are illuminated with a laser and viewed through a narrow band (1 mm) interference filter which eliminates specimen thermal radiation. Experimental results of tests on stainless steel and graphite at temperatures up to 1033K (1400 °F) and 2843K (4658 °F), respectively, are presented.
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