Features of multiband speckle shearography

Claas Falldorf; Wolfgang Osten; Ervin Kolenovic; Werner P. O. Jueptner

doi:10.1117/12.484535

29 July 2002 Features of multiband speckle shearography

Claas Falldorf, Wolfgang Osten, Ervin Kolenovic, Werner P. O. Jueptner

Proceedings Volume 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life; (2002) https://doi.org/10.1117/12.484535
Event: Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, 2002, Novosibirsk, Russian Federation

Abstract

Applications for coherent optical metrology usually use lasers as light sources, because of the excellent spatial and temporal coherence of the emitted light. By comparison, the demands of speckle shearography concerning the coherence of the light source are low. This enables certain white-light sources like mercury arc lamps to be an option. But using such a light source leads to new problems. Both the spatial and the temporal coherence are low. Due to the fact that multiple wavelengths are involved, dispersion effects become an issue and must be considered. Therefore, in this paper the multiband speckle shearography using a mercury arc lamp is investigated. Especially the problems arising from the light source are regarded. Finally, some experimental investigations of an object under load are presented.

Citation Download Citation

Claas Falldorf, Wolfgang Osten, Ervin Kolenovic, and Werner P. O. Jueptner "Features of multiband speckle shearography", Proc. SPIE 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, (29 July 2002); https://doi.org/10.1117/12.484535

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