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Title
Optical Dual Laser Based Sensor Denoising for OnlineMetal Sheet Flatness Measurement Using Hermite InterpolationPublished Date
2020Publisher
MDPI AGKeywords
cubic Hermite interpolationlaser triangulation
metal sheet
flatness measurement
roller leveling
smooth surface reconstruction
shape measurement system
Abstract
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 surf ... [+]
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. [-]
Publisher’s version
https://doi.org/10.3390/s20185441ISSN
1424-8220Published at
Sensors Vol. 20. N. 18. N. Art. 5441, 2020Document type
ArticleVersion
PublishedRights
© 2020 by the authors. Licensee MDPI, Basel, SwitzerlandAccess
Open AccessCollections
- Articles - Engineering [332]
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