Mr. Nansheng Zhang Profile

Nansheng Zhang

at Beijing Institute of Technology

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Proceedings Article | 5 November 2020 Paper

Sub-aperture image stitching of cylindrical mirror surface defects based on dark-field imaging

Nansheng Zhang, Shanshan Wang, Bowen Xu, Qiudong Zhu, Qun Hao

Proceedings Volume 11568, 1156813 (2020) https://doi.org/10.1117/12.2579835

KEYWORDS: Defect detection, Image processing, Microscopes, Imaging systems, Optical components

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High-precision cylindrical lens optics are widely used in high-precision equipment, such as high-power laser resonators and long-distance line interferometers. In most instances, this lens required to possess extremely low surface roughness and surface defects. Using dark-field microscopy to detect the surface defects of the cylindrical mirror is simpler than the interferometric, and the cost is lower. In the experiment, we designed a set of image acquisition devices based on the characteristics of the cylindrical mirrors, and used this device to obtain overlapping sub-aperture images of the cylindrical mirrors. According to the overlapping area to solve the relative position relationship of two adjacent sub-apertures, an image stitching algorithm based on defect location is proposed, which realizes the stitching of multiple sub-apertures. The experimental system was used to scan a plano-convex cylindrical mirror with a size of 22mm×22mm and a radius of curvature of 41.34mm. Splicing the obtained sub-aperture images of surface defects. Experiments show that the stitching algorithm has high matching accuracy and strong robustness.

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