Deformation-pattern-based digital speckle correlation for coefficient of thermal expansion evaluation of film.
Deformation-pattern-based digital speckle correlation for coefficient of thermal expansion evaluation of film.
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DOI：
10.1364/oe.19.017469
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发表时间：
2011-08
期刊：
影响因子：
3.8
通讯作者：
Zhanwei Liu;Jianxin Gao
中科院分区：
文献类型：
--
作者：
Zhanwei Liu;Jianxin Gao
本文提出了一种测量薄膜热膨胀系数的数字散斑相关方法，其中热膨胀系数是内参数和直接变量。采用CTE和温度控制的变形模式对胶片加热后的图像进行仿射变换。如果选择合适的CTE值，则仿射变换后的图像与原始图像具有最高的相似性。这将CTE测量变成了对最优试验CTE的纯数值搜索。将该方法的CTE结果与传统的DIC方法的CTE结果进行了比较，结果表明该方法具有较高的精度。
In this paper, a digital speckle correlation method for coefficient of thermal expansion (CTE) measurement of film is developed, in which CTE is the intrinsic parameter and direct variable. Deformation pattern governed by the CTE and temperature is used to affine transform the image captured after the film is heated. If the values of CTE are properly chosen, the image after affine transformation will have a highest similarity to the original image. This turns CTE measurement into a purely numerical search of an optimal trial CTE. Results of CTEs from this method and conventional DIC methods are compared with the actual CTE, showing an improved accuracy.