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基于普通镜头与改进视场分离技术的光学引伸计
Optical extensometer based on common lens and modified field-of-view splitting technique
投稿时间:2023-02-08  修订日期:2023-03-07
DOI:
中文关键词:  光学引伸计  视场分离  数字图像相关  应变测量精度  离面位移
英文关键词:optical extensometer  field-of-view splitting  digital image correlation  strain measurement accuracy  out-of-plane displacement
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
朱飞鹏* 河海大学 211100
付思鹏 河海大学 211100
白鹏翔 河海大学 211100
雷冬 河海大学 211100
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中文摘要:
      虽然基于远心镜头的光学引伸计在应变测量中具有精度高的优点,但是远心镜头成本高、视场固定的不足使得引伸计灵活性较差。因此,本文提出了一种基于低成本普通镜头与改进视场分离技术的光学引伸计。该方法取两个独立视场中心线上的点作为标距点,既减小了离面刚体位移对测量方向应变的影响,又有效增加了引伸计标距。开展了不锈钢试样的静态实验和单轴拉伸实验来验证该光学引伸计的可行性和测量精度,实验结果的均方根误差(RMSE)约为5με,表明改进的光学引伸计具有很高的应变测量精度。
英文摘要:
      Although optical extensometers based on telecentric lens have the advantages of high strain measurement accuracy, the shortcomings of high cost and fixed field of view (FOV) of telecentric lenses make the extensometer less flexible. Therefore, an optical extensometer based on low-cost common lens and improved FOV-splitting technique is proposed. This method takes the points on the centerline of two independent fields of view as the gauge points, which not only reduces the influence of the rigid-body displacement on the strain of the measurement direction, but also effectively increases the gauge length of extensometer. Static experiments and uniaxial tensile experiments of a stainless-steel specimen were carried out to verify the feasibility and measurement accuracy of the optical extensometer, and the root mean square error (RMSE) of the experimental results was approximately 5 με, indicating that the improved optical extensometer has high strain measurement accuracy.
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