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

Author:

Alonso MarcosORCID,Izaguirre AlbertoORCID,Andonegui Imanol,Graña ManuelORCID

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 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.

Funder

European Commission

Hezkuntza, Hizkuntza Politika Eta Kultura Saila, Eusko Jaurlaritza

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

Reference68 articles.

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5. ASTM A1030/A1030M-11, Measuring Flatness Characteristics of Steel Sheet Products, Standard Practice forhttps://www.astm.org/DATABASE.CART/HISTORICAL/A1030A1030M-11.htm

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