1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China; 2. Beijing Institute of Structure and Environment Engineering, Beijing 100076, China; 3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China; 4. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
Abstract:According to requirement of the high-temperature application from the digital image correlation (DIC) method, the speckle fabrication methods and high-temperature speckle image processing technique are studied in this paper. Taking high-temperature structural materials as the studied objects, a high-temperature speckle fabrication technique based on parametric template is developed. The technique is mainly based on a parametric template, which can adjust the parameters such as particle size, distribution density, and randomness in the template. As a result, the quality of the speckle can be optimized. A high-temperature speckle pattern was successful fabricated on the C-SiC composite substrate by the proposed technique, and the experiment verifies the speckle carrier can endure high temperature up to 1 200℃. At the same time, the influence factors of thermal disturbance and thermal radiation on DIC measurement results are analyzed. The high-temperature speckle images are corrected with approaches of image grayscale-average, circulating thermal disturbance and optical filtering method. And a test for measuring the thermal expansion coefficient is designed to verify the feasibility of the correction methods.
段淇元, 宫文然, 郭保桥, 吴立夫, 于兴哲, 谢惠民. 高温数字图像相关方法中的制斑和图像处理技术[J]. 清华大学学报(自然科学版), 2019, 59(6): 425-431.
DUAN Qiyuan, GONG Wenran, GUO Baoqiao, WU Lifu, YU Xingzhe, XIE Huimin. Techniques of speckle fabrication and imgae processing for high temperature digital image correlation. Journal of Tsinghua University(Science and Technology), 2019, 59(6): 425-431.
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