Deformation Measurements At Very High Temperatures By ESPI And Moire Methods
- 25 November 1986
- proceedings article
- Published by SPIE-Intl Soc Optical Eng
- Vol. 661, 62-69
- https://doi.org/10.1117/12.938593
Abstract
We describe two optical methods which have been used to measure the deformation and general behaviour of objects heated to high temperatures. TV-holography or ESPI has proven capable to follow and measure the surface behaviour and deformation with interferometric sensitivity to temperatures about +1600 °C, where the temperature limit is mainly determined by practical experimental problems and is not of fundamental character. Some preliminary results will be presented. The Moire method can be used to measure in-plane object movements to temperatures so far up to about +1300 °C by recording the variation in emissivity of an inscribed surface grating without external illumination.Keywords
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