| Citation: | YANG Zenan, XU Junjie, ZHAO Wanrong, et al. Measurement and characterization of geometric features of femtosecond laser of film hole based on cone beam CT[J]. Journal of Aerospace Power, 2023, 38（5）：1198-1209 doi: 10.13224/j.cnki.jasp.20230040
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In view of the current situation of low geometric accuracy and unstable quality of film cooling holes at home, experiments with different process parameters of femtosecond laser were carried out. The film cooling holes were analyzed based on the feature segmenting and point cloud fitting from slice image through computed tomography technology. Diameter and geometric features were tested and evaluated. The results showed that the diameter of the inlet of the film holes was slightly larger than that of the outlet with the process parameters of ultrafast laser, where the taper was between 0.005° and 0.020° for the testing detected by cone beam CT (computed tomography). The maximum position error was 0.072 mm. The incident angle of the special-shaped hole was roughly between 60° and 70°. It is reliable to use cone beam CT measurement method to detect and evaluate the geometric features of film cooling holes.
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