Deformation Measurements At Very High Temperatures By ESPI And Moire Methods

Ole J. Lokberg; Jan T. Malmo

doi:10.1117/12.938593

25 November 1986 Deformation Measurements At Very High Temperatures By ESPI And Moire Methods

Ole J. Lokberg, Jan T. Malmo

Proceedings Volume 0661, Optical Testing and Metrology; (1986) https://doi.org/10.1117/12.938593
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

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.

Citation Download Citation

Ole J. Lokberg and Jan T. Malmo "Deformation Measurements At Very High Temperatures By ESPI And Moire Methods", Proc. SPIE 0661, Optical Testing and Metrology, (25 November 1986); https://doi.org/10.1117/12.938593

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