非轴对称光纤三维折射率测量  

Research on three dimensional refractive index measurement of non-axisymmetric fiber optics

作　　者：何学兰 李佳慧[1] 王铁滨[1] 李文超[1] 邢键[1] 崔双龙 孟令知 HE Xuelan;LI Jiahui;WANG Tiebin;LI Wenchao;XING Jian;CUI Shuanglong;MENG Lingzhi(School of Computer and Control Engineering,Northeast Forestry University,Harbin 150040,China;School of Physics and Optoelectronic Engineering,Harbin Engineering University,Harbin 150006,China)

机构地区：[1]东北林业大学计算机与控制工程学院,黑龙江哈尔滨150040 [2]哈尔滨工程大学物理与光电工程学院,黑龙江哈尔滨150006

出　　处：《应用光学》2024年第6期1314-1320,共7页Journal of Applied Optics

基　　金：国家自然科学基金(62205087,62005064);中央高校基本科研业务费专项资金(2572023CT16)。

摘　　要：针对光纤非轴对称的特点,利用数字全息显微层析技术搭建了测试的光路系统,以物光波携带被测样品的相位信息为依据,对其在CCD上的信息进行提取。由于光纤非轴对称的特点,采集了360°的数字全息图,采用角谱理论的算法提取出每一幅全息图物光波的相位分布信息,通过层析重建算法得到三维折射率分布,然后分别以长盈通和康宁光纤为测试样本,测得光纤纤芯与包层折射率的差值分别为0.005和0.006,与厂家提供的参数基本一致。为了进一步验证所提测试方法的有效性,对焊点处进行折射率测量研究,实验结果表明,该测量方法的准确性优于以往的光纤测量方法,具有对光纤样品无损、测量方法简单、测量速度快等优点。According to the characteristics of non-axisymmetric optical fiber,the optical path system was built by using digital holographic microtomography.Based on the phase information of the measured sample carried by the object light wave,the information of the object light wave on the CCD was extracted.Due to the characteristics of non-axisymmetric optical fiber,a 360°digital hologram was collected.The phase distribution information of object light wave of each hologram was extracted by the reconstruction algorithm of angular spectrum theory,and the three-dimensional refractive index distribution was obtained by the reconstruction algorithm of tomography.Then,the Changying Tong and Corning fibers were used as test samples,the difference in refractive indices between the fiber core and cladding was measured to be 0.005 and 0.006,respectively,which was basically consistent with the parameters provided by the manufacturer.In order to further verify the effectiveness of the proposed testing method,the refractive index measurements were conducted at the solder joints.The experimental results show that the accuracy of the proposed measurement method is superior to previous fiber optic measurement methods,and it has advantages such as non-destructive testing of fiber optic samples,simple measurement methods,and fast measurement speed.

关 键 词：数字全息 非轴对称光纤 无损检测 非侵入式测量 三维折射率 

分 类 号：TN253[电子电信—物理电子学] O439[机械工程—光学工程]