Self-witnessing coherent imaging for artifact removal and noise filtering

Krause, Tessa J.H.; Allen, Troy R.; Fraser, James M.

doi:10.1016/j.optlaseng.2021.106936

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Cited by 8 publications

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“…A stable keyhole in the Al welding is generated by the ARM laser. The measurement points at 0 mm during the welding process result from the autocorrelation noise due to the weak multiple reflections within one arm [18] .…”

Section: Resultsmentioning

confidence: 99%

Welding depth measurement for different mode lasers using optical coherence tomography

Xie,

Wang,

Zhang

et al. 2024

中国光学快报

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Optical coherence tomography (OCT) allows a direct and precise measurement of laser welding depth by coaxially measuring the keyhole depth and can be used for process monitoring and control. When OCT measurement was taken during single-beam laser welding, the keyhole instability of aluminum welding resulted in highly scattered OCT data and complicated the welding depth extraction methods. As a combination of an inner core beam and an outer ring beam, a novel adjustable ring mode (ARM) laser for producing a stable keyhole was applied to the OCT measurement. Different ARM laser power arrangements were conducted on aluminum and copper. The results indicated that the ring beam greatly improved the stability of the core beam-induced keyhole, and smooth welding depth can be extracted from the concentrated OCT data.

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Section: Resultsmentioning

confidence: 99%