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Laser based strain measurement above 1500 deg C

An overview of COST 510 results
: Aswendt, P.

Saarton, L.A.; Zeedijk, H.B. ; Federation of European Materials Societies; Netherlands Society for Materials Science:
Materials, functionality & design. Proceedings of the 5th European Conference on Advanced Materials and Processes and Applications. Vol. 4: Characterization and production/design : EUROMAT 97, Maastricht, NL, 21 - 23 April 1997
Zwijndrecht: Netherlands Society for Materials Science, 1997
ISBN: 90-803513-4-2
European Conference on Advanced Materials and Processes and Applications (EUROMAT) <5, 1997, Maastricht>
Conference Paper
Fraunhofer IWU ()
laser metrology; speckle technique; strain measurement; high temperature

Demands on measuring techniques are extremely high for the characterization of CMC materials at temperatures above 1500 deg C. Therefore, the development of non-contacting systems is the main objective of an European COST action. This paper gives an overview of current results obtained from Austrian and German research groups. Three different laser based approaches have been realized: double illumination speckle pattern interferometry, double aperture speckle pattern interferometry, double sensor speckle pattern correlation, they differ with respect to their capability, each of them has specific advantages. In a first step, a feasibility study has been done to find out if the proposed optical techniques will work. Prototype systems were tested on C/C and C/SiC specimens at temperatures above 1500 deg C. Experimental results will be presented demonstrating the accuracy and potential of interferometric testing.To qualify the newly developed solutions contacting extensometers have been us ed in both, comparative measurements and round-robin tests.