Measurement Method Based on Line-Laser-Sensor Array for PVC-Flooring Lock Joints

To address the challenges of destructive testing, high time consuming, and insufficient digitizing for the contour measurement of lock joints during the PVC flooring manufacturing process, a measurement system was developed based on the line-laser sensor array. Utilizing a multi-angle arrangement of multiple line-laser sensors, the system was arranged to achieve comprehensive measurement of the PVC flooring lock joint. A global calibration method with three-dimensional calibration block was proposed to improve measurement accuracy. Extracting curvature features from the calibration block data captured by each sensor, and executing coarse alignment with rigid transformation, the system was arranged to carry out precise alignment based on the iterative dual closest point (DCP) algorithm. The global calibration of the multi-line-laser-sensor array was finally achieved, so as to improve the precision of the proposed measurement system. The experimental results show that a maximum deviation of 0.012 mm can only appear in the measuring process of standard gauge block. A root mean square error 0.018 mm (RMSE) between the measured and refereed contours for the regular lock joints, and a maximum deviation 0.051 mm are meet for the high-precision measurement requirements of the PVC flooring.