Structured light-based dynamic 3D measurement system for cold-formed steel hollow sections Online publication date: Tue, 16-Aug-2022
by Zemin Mao; Dahua Li; Xuewen Zhao
International Journal of Mechatronics and Manufacturing Systems (IJMMS), Vol. 15, No. 2/3, 2022
Abstract: In the cold-formed steel hollow section manufacturing process, one of the key stages is forming an inspection to check whether it meets the requirement. In this paper, a dynamic 3D measurement system based on low-cost structured light was presented, which can be used to measure the dimensions of a cold-formed steel hollow section in real-time. The system is mainly composed of four sets line-structured light inspection device. A temporary coordinate is proposed to assist in solving multi the calibration of structured light plane. An optimisation method of L-M algorithm is proposed to solve the problem of stitching accuracy of point cloud contour. A point cloud simplification processing method is proposed for solving main parameters. The side length measurement error of the system is within ±0.05 mm, and the outer arc radius measurement error is within ±0.45 mm. All parallelisable tasks can achieve an acquisition rate of up to 25 fps.
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