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首页> 外文期刊>Journal oflaser Applications >Automatic calibration of a scanner-based laser welding system
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Automatic calibration of a scanner-based laser welding system

机译：自动校准基于扫描仪的激光焊接系统

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摘要

In precision engineering scanners are widely used for laser beam positioning. Equipped with cameras, scanners enable process monitoring or even position recognition of the parts to be welded. To allow precise welding or position recognition, it is essential to calibrate a welding system. Instead of calibrating the whole system, most approaches only help to adjust the laser beam position. Consequently, the varying lateral offset between the laser's focus point and the camera's field of view, due to chromatic aberration of the scanner optics, cannot be compensated. Furthermore, these approaches require manual microscopic measurement of weld seams, which comes along with several downsides. This paper proposes two techniques for automatic calibration without these downsides by use of the system-incorporated camera. The first technique is the calibration at laser wavelength. To this end, the system automatically creates laser spots, evaluates their positions and possible offsets, and finally fits an affine model for compensation. The second technique is based on a specially coded test pattern, which is used for calibration at camera wavelengths. Experimental results confirm the accuracy of the calibration obtained.
机译：在精密工程中，扫描仪广泛用于激光束定位。配备摄像头的扫描仪可实现过程监控，甚至可以识别待焊接零件的位置。为了实现精确的焊接或位置识别，必须校准焊接系统。除校准整个系统外，大多数方法仅有助于调整激光束位置。因此，由于扫描仪光学器件的色差，激光的焦点与相机的视场之间的横向偏移不会得到补偿。此外，这些方法需要对焊缝进行人工显微测量，这伴随着一些缺点。本文提出了两种使用系统内置摄像头的自动校准技术，它们没有这些缺点。第一种技术是在激光波长下进行校准。为此，系统会自动创建激光光斑，评估其位置和可能的偏移，最后拟合仿射模型进行补偿。第二种技术基于特殊编码的测试图案，该图案用于在相机波长处进行校准。实验结果证实了所获得校准的准确性。

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