Pixel definition evaluation of turbine blade air film hole

Chao Zhang; Chao Bi; Chenghai Hu

doi:10.1117/12.2669416

21 March 2023 Pixel definition evaluation of turbine blade air film hole

Chao Zhang, Chao Bi, Chenghai Hu

Proceedings Volume 12595, Advanced Fiber Laser Conference (AFL2022); 125952E (2023) https://doi.org/10.1117/12.2669416
Event: Advanced Fiber Laser Conference (AFL2022), 2022, Changsha, China

Abstract

In view of the characteristics of low precision, unstable quality and high rejection rate of the current gas film hole molding, there is no universal and engineered gas film hole detection equipment in China. A set of image detection equipment based on machine vision is developed to improve the efficiency and accuracy of the gas film hole detection. According to the depth of field synthesis and three-dimensional reconstruction technology, the resolution of pixels of different pictures in the same location is analyzed. Thus, the evaluation function of the pixel is obtained, and then each pixel is calculated, and the depth information of the pixel is given to complete the three-dimensional reconstruction. This paper proposes a method for evaluating the pixel clarity of gas film holes in turbine blades. Since the edge detection algorithm of traditional Sobel operator is poor, this paper proposes four-direction and eight-direction Sobel operators to evaluate the pixel clarity of standard measure blocks with the same material of gas film holes by giving different weights. Then, according to the experimental results, the window size of pixel sharpness evaluation was discussed, and the clarity ratio, steepness, local extreme factor and sensitivity of different window sizes were calculated respectively. Finally, the window size suitable for the evaluation of pixels in the air film hole was obtained. Finally, all the pixels were calculated, and the calculation results were compared with the real situation to verify the correctness of the proposed algorithm.

Citation Download Citation

Chao Zhang, Chao Bi, and Chenghai Hu "Pixel definition evaluation of turbine blade air film hole", Proc. SPIE 12595, Advanced Fiber Laser Conference (AFL2022), 125952E (21 March 2023); https://doi.org/10.1117/12.2669416

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available