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激光焊接对接拼缝测量的微景深方法

DOI: 10.11834/jig.20120907

Keywords: 激光焊接,对接拼缝,视觉测量,微景深,清晰度

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Abstract:

对于复杂微细、错边量小的激光焊接拼缝测量,现有的视觉传感器方法不能稳定、可靠地提取出拼缝的中心位置、拼缝宽度等信息。为此,提出了基于微景深的激光焊接对接拼缝测量方法,该方法采用高倍光学放大镜头、工业CCD(ChargeCoupledDevice)/CMOS(ComplementaryMetal-Oxide-SemiconductorTransistor)相机和LED(Light-EmittingDiode)外部照明装置,以光学成像光轴与被测表面法矢呈45°的方式,组成的对接拼缝的非接触测量系统,既解决了显微放大时景深很小、测量范围小的问题,又解决了狭窄拼缝高光学放大倍数拼缝检测的难题。实验结果表明,该系统可快速准确地提取出拼缝中心坐标、拼缝宽度以及拼缝局部表面法矢。拼缝宽度测量精度优于5μm,拼缝中心测量精度优于6μm,可识别的最小拼缝宽度为0.02mm,完全满足激光焊接对接狭窄拼缝的检测与自动跟踪的要求。

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