| Acquisition and processing of coaxial image of molten pool and keyhole in Nd：YAG laser welding with high power |
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| 引用本文： | 秦国梁,齐秀滨,杨永波,王旭友,林尚扬. Acquisition and processing of coaxial image of molten pool and keyhole in Nd：YAG laser welding with high power[J]. 中国焊接, 2004, 13(1): 51-55 |
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| 作者姓名： | 秦国梁 齐秀滨 杨永波 王旭友 林尚扬 |
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| 作者单位： | [1]StateKeyLaboratoryofAdvancedWeldingProductionTechnology,HarbinInstituteofTechnology,Harbin,150001 [2]HarbinWeldingInstitute,Harbin,150080 |
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| 摘 要： | An experimental setup of acquiring the coaxial visual image of the molten pool and keyhole in high power Nd:YAG laser welding is introduced in this paper. It is one of the most difficult problems in acquiring coaxial image that the coaxial imaging signal of molten pool and keyhole must be separated from the laser beam with high power. This problem was resolved by designing a dichroitic spectroscope. The characteristics of imaging signal were analyzed and the coaxial image of molten pool and keyhole was acquired. A smoothing filter and a homomorphic filter were designed to remove the low frequency noise and to enhance the image according to the characteristics of imaging signal. At last, edges of molten pool and keyhole were detected and extracted based on image segmentation with threshold.
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| 关 键 词： | Nd：YAG激光 激光焊接 高功率激光 熔池 小孔 图象处理 |
Acquisition and processing of coaxial image of molten pool and keyhole in Nd:YAG laser welding with high power |
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| Qin Guoliang,Qi Xiubin,Yang Yongbo,Wang Xuyou and Lin ShangyangState Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin,. Harbin Welding Institute,Harbin,.. Acquisition and processing of coaxial image of molten pool and keyhole in Nd:YAG laser welding with high power[J]. China Welding, 2004, 13(1): 51-55 |
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| Authors: | Qin Guoliang Qi Xiubin Yang Yongbo Wang Xuyou Lin ShangyangState Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin . Harbin Welding Institute Harbin . |
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| Affiliation: | 1. State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin,150001
2. Harbin Welding Institute,Harbin,150080 |
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| Abstract: | An experimental setup of acquiring the coaxial visual image of the molten pool and keyhole in high power Nd:YAG laser welding is introduced in this paper. It is one of the most difficult problems in acquiring coaxial image that the coaxial imaging signal of molten pool and keyhole must be separated from the laser beam with high power. This problem was resolved by designing a dichroitic spectroscope. The characteristics of imaging signal were analyzed and the coaxial image of molten pool and keyhole was acquired. A smoothing filter and a homomorphic filter were designed to remove the low frequency noise and to enhance the image according to the characteristics of imaging signal. At last, edges of molten pool and keyhole were detected and extracted based on image segmentation with threshold. |
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| Keywords: | laser welding molten pool keyhole coaxial visual image image processing |
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