Influence of object motion on roughness measurements using spectral speckle correlation Article Swipe

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Patrick Laux , Annelie Schiller , Claudia Monika Bett , Alexander Bertz , Daniel Carl , Stephan Reichelt ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.1364/oe.578858

Spectral speckle correlation (SSC) enables fast, non-contact surface-roughness metrology, but object motion usually degrades its accuracy. We aim to enable measurements on moving objects and present a unified model that separates the total correlation into a wavelength-dependent term, from which the surface roughness is derived, and a kinematic term that quantifies motion blur, which affects the speckle contrast. The kinematic contribution yields a closed-form variance expression, similar to that in laser speckle contrast imaging (LSCI). The model was validated using a galvanized steel sheet with a roughness of 1.23 µm S a , translated at up to 20 mm s −1 (approximately five speckles per exposure). Measured correlations agree with theory to within 1.06 % on average and 4.4 % at worst. Further improvements can reduce the error to 2.5 % for blur values smaller than 4 speckles per exposure. Scaling laws derived from the model indicate that the use of lasers with a power output of 125 mW and an illumination spot diameter of 5 mm can enable SSC at velocities up to 16 m s −1 , which is comparable to typical industrial band feeding rates. The results establish SSC as a viable, high-throughput alternative to conventional profilometry for continuous in-line roughness monitoring of fast-moving surfaces.

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Type: article
Language: en
Landing Page: https://doi.org/10.1364/oe.578858
OA Status: gold
References: 9
OpenAlex ID: https://openalex.org/W4415617927

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OpenAlex ID: https://openalex.org/W4415617927

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DOI: https://doi.org/10.1364/oe.578858

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Title: Influence of object motion on roughness measurements using spectral speckle correlation

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Type: article

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Language: en

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Publication year: 2025

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Publication date: 2025-10-28

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Authors: Patrick Laux, Annelie Schiller, Claudia Monika Bett, Alexander Bertz, Daniel Carl, Stephan Reichelt

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Landing page: https://doi.org/10.1364/oe.578858

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OA status: gold

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OA URL: https://doi.org/10.1364/oe.578858

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Cited by: 0

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References (count): 9

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