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High-speed measurements of steel-plate deformations during laser surface processing

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Abstract

In this paper we present a novel approach to monitoring the deformations of a steel plate’s surface during various types of laser processing, e.g., engraving, marking, cutting, bending, and welding. The measuring system is based on a laser triangulation principle, where the laser projector generates multiple lines simultaneously. This enables us to measure the shape of the surface with a high sampling rate (80 Hz with our camera) and high accuracy (±7 μm). The measurements of steel-plate deformations for plates of different thickness and with different illumination patterns are presented graphically and in an animation.

©2004 Optical Society of America

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Supplementary Material (2)

Media 1: GIF (2740 KB)     
Media 2: GIF (3335 KB)     

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Figures (5)

Fig. 1.
Fig. 1. Experimental set-up.
Fig. 2.
Fig. 2. Plate deformation during laser-spot illumination. The beam diameter was 200 μm for the first row, and 1 mm for the second row. The illumination time was 2 sec in both cases. The vertical axes in the graphs are magnified 10 times. [Media 1]
Fig. 3.
Fig. 3. Plate deformation during laser illumination with a linear beam-propagation path. The image shows the plate deformation during the third scan at the moment when the beam reaches ¾ of the plate width. The vertical axis is magnified 10 times. [Media 2]
Fig. 4.
Fig. 4. Plate deformation after laser drilling with various frequencies.
Fig. 5.
Fig. 5. Laser-based flattening of a convex-shaped plate deformation.
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