Kapitel/Beitrag aus dem Buch: Beyerer J. & Längle T. 2021. OCM 2021 – 5th International Conference on Optical Characterization of Materials, March 17th – 18th, 2021, Karlsruhe, Germany : Conference Proceedings.
We present an improved processing of laser speckle
intensity signals aimed at attaining spatial displacement resolutions
well in the sub-pixel domain, which is necessary for measuring
the minute displacements caused by thermal expansion
of metallic specimens. The signal processing revolves around
the cross power spectral density and the coherence function of
two discrete signals, which allows for a continuously varying
displacement result as opposed to a discretized, if determined
in the spatial domain via the application of the cross-correlation
function. The presented technique is then applied to estimate the
coefficient of linear thermal expansion (CLTE) of a brass sample.
Spaett A. & Zagar B. 2021. Measurement of the coefficient of linearthermal expansion based on subjective laserspeckle patterns. In: Beyerer J. & Längle T (eds.), OCM 2021 – 5th International Conference on Optical Characterization of Materials, March 17th – 18th, 2021, Karlsruhe, Germany : Conference Proceedings. Karlsruhe: KIT Scientific Publishing. DOI: https://doi.org/10.58895/ksp/1000128686-10
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Veröffentlicht am 17. März 2021