Speckle interferometry for materials testing under extreme thermal conditions

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