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Speckle interferometry for materials testing under extreme thermal conditions

: Aswendt, P.; Höfling, R.


Measurement 23 (1998), S.205-213 : Ill., Lit.
ISSN: 0263-2241
Fraunhofer IWU ()
ceramic matrix composites; digital speckle pattern interferometry; high temperature testing; non-contacting strain measurement; superalloy; thermal shock testing

The range of application of a non-contacting optical technique, speckle pattern interferometry, has been extended to high temrperature testing. Extreme thermal conditions cause disturbances that have been studied systematically. Based upon these pre-tests, two prototype systems were developed and they proved well-suited for measuring a field of strain data up to 1500 deg C and also during rapid heating or cooling. Various examples illustrate the new possibilities in materials testing.