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清华大学学报(自然科学版)  2019, Vol. 59 Issue (6): 425-431    DOI: 10.16511/j.cnki.qhdxxb.2019.26.006
  航空航天与工程力学 本期目录 | 过刊浏览 | 高级检索 |
高温数字图像相关方法中的制斑和图像处理技术
段淇元1,3, 宫文然2, 郭保桥3, 吴立夫4, 于兴哲1, 谢惠民1
1. 清华大学 航天航空学院, 北京 100084;
2. 北京强度环境研究所, 北京 100076;
3. 北京理工大学 爆炸科学与技术国家重点实验室 北京 100081;
4. 北京宇航系统工程研究所, 100076
Techniques of speckle fabrication and imgae processing for high temperature digital image correlation
DUAN Qiyuan1,3, GONG Wenran2, GUO Baoqiao3, WU Lifu4, YU Xingzhe1, XIE Huimin1
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
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摘要 结合数字图像相关(digital image correlation,DIC)方法高温应用的需求,该文重点对散斑制备技术和高温散斑图像处理技术进行了研究。首先,以高温结构材料为对象,研发了一种基于参数化模板的高温散斑制作工艺。该工艺基于参数化模板,可调整模板中散斑颗粒大小、分布密度和分布随机度等多个参数,成功地在C-SiC复合材料基底上制备出可耐1 200℃高温散斑载体。其次,分析了热气流、热辐射对DIC测量结果的影响,结合图像灰度平均方法、循环高温炉外热气流和光学滤波法等3种手段进行高温散斑图像的修正,并通过热膨胀系数测量实验验证了修正方法的可行性。
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段淇元
宫文然
郭保桥
吴立夫
于兴哲
谢惠民
关键词 高温数字图像相关热气流热辐射散斑    
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.
Key wordshigh temperature    digital image correlation    thermal disturbance    thermal radiation, speckle pattern
收稿日期: 2018-12-05      出版日期: 2019-06-01
通讯作者: 谢惠民,教授,E-mail:xiehm@tsinghua.edu.cn     E-mail: xiehm@tsinghua.edu.cn
引用本文:   
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.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2019.26.006  或          http://jst.tsinghuajournals.com/CN/Y2019/V59/I6/425
  图1 光纤激光打标机
  图2 散斑制备流程图
  图3 散斑模板矢量图及制斑结果
  图4 (网络版彩图)刚体平移仿真实验结果
  图5 (网络版彩图)刚体旋转仿真实验结果
  图6 DIC测量基本原理
  图7 实验装置
  图8 灰度平均图像数与平均应变及标准差的关系
  图9 空气循环和滤波片与应变均值和标准差的关系
  图10 800℃ 高温下采集的的散斑图
  表1 修正方法的效果
  图11 GH4169试件表面散斑图
  图12 升温曲线
  图13 热膨胀系数的理论值和实验值对比
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