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18 September 2014The optical surface defect inspection by fringe reflection
A method for the optical surface defects inspection based on fringe reflection is studied. The test system is composed of
the fringe screen (a liquid crystal display, LCD), CCD camera and a computer. The intensity-modulated patterns are
generated on the screens on both the horizontal and vertical directions respectively. The CCD records the pattern images
via the tested surface. The phase and amplitude modulation are calculated by the phase-shifting technique. The defects
location can be got from the amplitude modulation. Also the height of the defects can be gained by integration from the
phase change caused by the defects. This method is simple and cheap. Compared with other techniques, this technique
can get the three dimension information of the defects. The experimental results have confirmed the feasibility of this
Wenchuan Zhao andLulu Li
"The optical surface defect inspection by fringe reflection", Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 928210 (18 September 2014); https://doi.org/10.1117/12.2071177
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Wenchuan Zhao, Lulu Li, "The optical surface defect inspection by fringe reflection," Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 928210 (18 September 2014);