2 February 2009 Vision detecting of arc welding pool surface topography based on projected grating
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A vision detecting of arc welding pool surface topography system was setup in this paper. A semiconductor laser as an active light-source which is projected laser on to the specialized grating and frost glass by collimating lens, deformed grating fringes are formed on the surface of arc welding pool, narrow band filter and neutral density filter are mounted on CCD for detecting pool surface topography at real time on the other side of the system. When projecting angle and shooting angle are selected properly, it can be avoided the interference of arc for pool image better, deformed grating fringes of pool surface can be detected. Deformed grating fringes are reflected the information of concave or convex of the pool. Two categories of stainless steel are experimented, deformed grating fringes of pool are got clearly under the condition of different welding current and different welding speed, pool edge is extracted by digital image processing technology, the geometric parameters of pool Front-side is obtained by demarcated and calculated successfully.
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Yanfeng Wang, Nansheng Liu, Youzhi Yuan, "Vision detecting of arc welding pool surface topography based on projected grating", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 716033 (2 February 2009); doi: 10.1117/12.811460; https://doi.org/10.1117/12.811460

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