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Steps towards the use of DSPI for high temperature strain measurement

: Aswendt, P.; Höfling, R.

Gorecki, C. ; Centre National de la Recherche Scientifique -CNRS-, Paris; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical inspection and micromeasurements : 10 - 14 June 1996, Besançon, France
Bellingham, Wash.: SPIE, 1996 (Europto series)
ISBN: 0-8194-2168-5
International Symposium on Laser, Optics and Vision for Productivity in Manufacturing <1, 1996, Besancon>
Conference "Optical Inspection and Micromeasurements" <1996, Besancon>
Fraunhofer IWU ()
high temperature strain measurement; digital speckle pattern interferometry; ceramic matrix composites

This paper describes a systematic study of influences that have to be overcome for the application of interferometry in the high temperature range. A specially designed test facility including an optical arrangement is used for the investigation of CMC specimens. Verification tests are performed up to 1500 deg C with combinded thermal-mechanical load sets. The fringe quality achieved allows to evaluate a field of displacement and strain data. Experimental experience gained is convincing to reach even higher temperatures and to test CMC components as well.