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Research on refraction error correction of digital image correlation technology in strain measurement of airship skin

机译：数字图像相关技术在飞艇蒙皮应变测量中的屈光误差校正研究

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摘要

Digital image correlation method is a widely used non-contact deformation measurement method. However, in low temperature environment the airships stay in, the camera needs to be protected by thermal insulation device, the optical glass of which introduces the refraction error to photogrammetry technology. To solve the influence of refraction error on the deformation measurement accuracy of digital image correlation method, the displacement deviation caused by refraction is theoretically deduced to obtain the deviation model based on the analysis of refraction light path and digital image correlation method. Moreover, the corresponding refraction error correction based on deformation function is proposed. Through the contrast experiment, it is found that the refraction offset error model is consistent with the actual displacement deviation. The digital image correlation method based on the refraction error correction proposed in this paper can effectively depress the refraction effect of glass, reduce the measurement error and improve the deformation measurement accuracy.
机译：数字图像相关方法是一种广泛使用的非接触变形测量方法。然而，在低温环境中，飞艇会留在里面，照相机需要用隔热装置保护，其光学玻璃将折射误差引入摄影测量技术中。为了解决折射误差对数字图像相关方法变形测量精度的影响，在折射光路分析和数字图像相关方法的基础上，理论上推导了折射引起的位移偏差，得到了偏差模型。此外，提出了基于变形函数的屈光误差校正方法。通过对比实验，发现折射偏移误差模型与实际位移偏差相吻合。本文提出的基于屈光误差校正的数字图像相关方法可以有效地抑制玻璃的屈光效果，减少测量误差，提高变形测量精度。

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