Abstract
Due to the speckle noise and welding light noise, it's still a challenge for the detection of tight weld joints by wide-field illumination. To circumvent this problem, we proposed a novel weld joint detection system by using periodic wide-field illumination. A specific frequency component can be encoded into the image sequence by modulating the intensity of the illumination. By leveraging high-speed light-emitting diode (LED) driver and high-speed camera, an image sequence can be obtained in milliseconds. Most of the light noises contain no modulation information. By extracting the modulation frequency from the image sequences, we achieved ~35% improvement in signal-to-noise ratio (SNR) of the seam image. In addition, the light noise can be removed effectively in the frequency domain. The comparisons under different welding conditions revealed that the proposed method could accurately locate the seam position in ultra-tight seam and under strong light noise while the method without modulation failed.
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