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Open AccessArticle

Optical Dual Laser Based Sensor Denoising for OnlineMetal Sheet Flatness Measurement Using Hermite Interpolation

1
Robotics and Automation Group, ECS Department, Mondragon University, 20500 Mondragon, Spain
2
Computational Intelligence Group, Computer Science Faculty, University of the Basque Country, UPV/EHU, 00685 San Sebastian, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(18), 5441; https://doi.org/10.3390/s20185441
Received: 5 August 2020 / Revised: 4 September 2020 / Accepted: 19 September 2020 / Published: 22 September 2020
Flatness sensors are required for quality control of metal sheets obtained from steel coils by roller leveling and cutting systems. This article presents an innovative system for real-time robust surface estimation of flattened metal sheets composed of two line lasers and a conventional 2D camera. Laser plane triangulation is used for surface height retrieval along virtual surface fibers. The dual laser allows instantaneous robust and quick estimation of the fiber height derivatives. Hermite cubic interpolation along the fibers allows real-time surface estimation and high frequency noise removal. Noise sources are the vibrations induced in the sheet by its movements during the process and some mechanical events, such as cutting into separate pieces. The system is validated on synthetic surfaces that simulate the most critical noise sources and on real data obtained from the installation of the sensor in an actual steel mill. In the comparison with conventional filtering methods, we achieve at least a 41% of improvement in the accuracy of the surface reconstruction. View Full-Text
Keywords: cubic Hermite interpolation; laser triangulation; metal sheet; flatness measurement; roller leveling; smooth surface reconstruction; shape measurement system cubic Hermite interpolation; laser triangulation; metal sheet; flatness measurement; roller leveling; smooth surface reconstruction; shape measurement system
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Alonso, M.; Izaguirre, A.; Andonegui, I.; Graña, M. Optical Dual Laser Based Sensor Denoising for OnlineMetal Sheet Flatness Measurement Using Hermite Interpolation. Sensors 2020, 20, 5441.

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