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24 February 2005 High-temperature video-extensometry for material testing of refractories
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The motivation for this work arises from the need for a contactless extension measurement system to obtain material properties of refractories at elevated temperatures of up to 1400°C. There is a lack of tactile probes capable of performing reliable measurements at this temperature range. Presently, the deformation of the specimen is estimated by measuring the movement of the testing machine. To determine material properties such as the modulus of elasticity more accurate information about the real deformation is required. This work presents an optical arrangement and mechanical setup for image acquisition at high temperatures and at a high degree of thermal radiation. Furthermore, an efficient and stable image processing algorithm based on edge detection and line fitting using singular value decomposition is presented. Subsequently the sources of measurement errors are determined and examined. The accuracy of the measurement result is estimated.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Schalk, Ewald Fauster, and Paul L. O'Leary "High-temperature video-extensometry for material testing of refractories", Proc. SPIE 5679, Machine Vision Applications in Industrial Inspection XIII, (24 February 2005);

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