Mr. CHuYi Fan Profile

CHuYi Fan

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Proceedings Article | 18 March 2024 Paper

Study on pixel evaluation function of air film hole image of turbine blade

Chuyi Fan, Chao Zhang, Shibo Ai, Yang Li

Proceedings Volume 13104, 131040G (2024) https://doi.org/10.1117/12.3018196

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In the process of measuring the diameter of the air film holes in turbine blades, visual technology is widely used. However, the selection of a clearness evaluation method and clearness evaluation operator for the pixels in the images obtained by photography is a crucial problem. In view of the small diameter of the air film holes in turbine blades, strong reflective characteristics of the material, difficulties in obtaining a focused image of the oblique holes, and difficulties in edge extraction, a five-axis measurement system was built using a three-coordinate measuring machine and a two-axis rotary table to take a series of pictures of the air film holes in turbine blades. In terms of image processing, different clearness evaluation functions were used to test images at different focal positions, including Sobel function, Brenner function, Tenengrad function, Laplacian function, etc. By comparing and analyzing the clearness evaluation curves obtained by these functions, the most suitable clearness evaluation function was selected. In order to make the results more convincing, the selected function was normalized to ensure its evaluation results were comparable across different images. Finally, a suitable clearness evaluation function for the air film holes in turbine blades was derived and its effectiveness was verified. This achievement lays a foundation for the improvement of the Sobel operator in the future, which is helpful to improve the accuracy and stability of measuring the diameter of air film holes in turbine blades.

Proceedings Article | 9 January 2023 Paper

Research on key technology of compound polishing of off-axis parabolic mirror

Deqing Zhu, Chuyi Fan, Jianguo Fang, Xiaoyue Guo , Yang Li

Proceedings Volume 12507, 125070V (2023) https://doi.org/10.1117/12.2655107

KEYWORDS: Polishing, Surface finishing, Mirrors, Aspheric lenses, Ion beams, Off axis mirrors, Interferometers, Spherical lenses, Optics manufacturing

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Off-axis aspherical surface have the advantages of excellent optical performance and simplified system structure. In order to satisfy the requirements of high-precision off-axis aspheric mirror in the telescopic system of some equipment, the research on ultra-precision manufacturing technology of off-axis aspheric mirror is carried out, and a composite polishing and detection technology based on robot-controlled optical surfacing and ion beam figuring is proposed. In the processing stage, the robotic flexible polishing and gadget polishing are used to quickly grind and polish the aspheric surface, and then the pitch lap is used to smooth the mid-spatial-frequency errors. Finally the aspheric surface is machined to the final requirement by ion beam figuring. In the detection stage, the coordinate measuring machine is used to detect the surface shape in the grinding stage, and the stigmatic null test is used to detect the aspheric shape in the fine polishing stage. Using the proposed method, the off-axis aspheric surface of a caliber 408mm is machined and tested, and the final surface figure error was 0.015 λ (λ = 632.8nm), which meets the requirements of the index.

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