| Related citation: | Yiming Li,Huazhong Xiang,Jiankun Tu,Gang Zheng,Minghui Chen,Bin Jiang.Measurement of Optical Fiber Geometry Parameters with Bessel Function Fitting Method[J].Journal of Harbin Institute Of Technology(New Series),2021,28(2):74-81.DOI:10.11916/j.issn.1005-9113.19050. |
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| Author Name | Affiliation | | Yiming Li | Shanghai Engineering Research Center of Interventional Medical Device, Key Laboratory of Ministry of Education for Applied Optical Instruments, University of Shanghai for Science and Technology, Shanghai 200093, China | | Huazhong Xiang | Shanghai Engineering Research Center of Interventional Medical Device, Key Laboratory of Ministry of Education for Applied Optical Instruments, University of Shanghai for Science and Technology, Shanghai 200093, China | | Jiankun Tu | Shanghai Cable Research Institute, Shanghai 200093, China | | Gang Zheng | Shanghai Engineering Research Center of Interventional Medical Device, Key Laboratory of Ministry of Education for Applied Optical Instruments, University of Shanghai for Science and Technology, Shanghai 200093, China | | Minghui Chen | Shanghai Engineering Research Center of Interventional Medical Device, Key Laboratory of Ministry of Education for Applied Optical Instruments, University of Shanghai for Science and Technology, Shanghai 200093, China | | Bin Jiang | Shanghai Cable Research Institute, Shanghai 200093, China |
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| Abstract: |
| Geometry parameters of optical fiber are crucial in evaluating the quality of the optical fiber. Near-field light distribution method is recommended in GB15972.20-2008 for the measurement of geometry parameters. To distinguish the boundary between fiber core and cladding, it is necessary to illuminate the fiber. The end face of the core is a bright spot with unclear edge, so the true edge of the core and the cladding cannot be accurately judged. A method is proposed in this paper to measure the geometry parameters of optical fiber by Bessel function fitting. Theoretically, the solution to the electromagnetic vector of mode field satisfies Bessel function, and the boundary between the core and the cladding can be precisely extracted by Bessel function fitting. Edges of the fiber were fitted by elliptical curves, and the geometry parameters of the fibers could be calculated. Results show that the maximum deviations of the diameters and the average differences of the fibers were decreased under normal and abnormal conditions respectively. The proposed method is an efficient way to obtain edge data and can improve the accuracy and stability of geometry parameters of optical fibers. |
| Key words: geometry parameters of optical fiber Bessel function edge detect |
| DOI：10.11916/j.issn.1005-9113.19050 |
| Clc Number:TN818 |
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| Descriptions in Chinese: |
| 贝塞尔函数拟合法测量光纤几何参数 李一鸣1, 项华中1, 涂建坤2, 郑刚1,陈明惠1, 江斌2 (1 上海介入医疗器械工程研究中心, 教育部重点应用光学实验室, 上海理工大学, 上海200093； 2 上海电缆研究所,上海200093) 中文说明：光纤的几何参数是衡量光纤质量的重要参数。国标GB15972.20-2008中推荐的光纤几何参数测量方法为近场光分布法。为区分纤芯和包层的边界，需要对光纤进行通光照明。纤芯端面是在图像中显示为一个边缘不清晰的亮斑，无法准确判断纤芯和包层的真实边缘。本文提出一种用贝塞尔函数拟合法测量光纤几何参数的方法。从理论上讲，模场电磁矢量的解满足贝塞尔函数，通过贝塞尔函数拟合可以精确地提取纤芯与包层之间的边界。利用椭圆曲线拟合出光纤的边缘，并计算出光纤几何参数。结果表明，在正常和非正常条件下，光纤直径的平均偏差和重复测量误差均有所减小。该方法是获取光纤边缘数据，提高光纤几何参数精度和稳定性的有效方法。 关键词：光纤几何参数；贝塞尔函数；边缘提取 |
