吉林大学学报(信息科学版) ›› 2021, Vol. 39 ›› Issue (2): 166-172.

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湿腐蚀法制备 U 形塑料光纤折射率传感器

孙思文a,b, 尹悦鑫a,b, 王曙敏a,b, 刘 阔a,b, 孙小强a,b, 王 菲a,b, 张大明a,b   

  1. 吉林大学 a. 电子科学与工程学院; b. 集成光电子学国家重点实验室, 长春 130012

  • 收稿日期:2020-12-10 出版日期:2021-04-19 发布日期:2021-04-27
  • 通讯作者: 张大明(1970— ), 男, 长春人, 吉林大学教授, 博士生导师, 主要从事平面集成光路器件及其集成技术研究, (Tel)86-431-85168097(E-mail)zhangdm@jlu.edu.cn
  • 作者简介:孙思文(1995— ), 女, 黑龙江黑河人, 吉林大学硕士研究生, 主要从事聚合物光纤通信及传感研究,(Tel)86-18645612931(E鄄mail)sunsw18@ mails.jlu.edu.cn
  • 基金资助:
    吉林市科技创新发展计划基金资助项目(201830793); 吉林省科技发展计划基金资助项目(20190302010GX)

U-Shaped Plastic Optical Fiber Refractive Index Sensor Prepared by Wet Etching Technique

SUN Siwena,b, YIN Yuexina,b, WANG Shumina,b, LIU Kuoa,b,SUN Xiaoqianga,b, WANG Feia,b, ZHANG Daminga,b   

  1. a. College of Electronic Science and Engineering; b. State Key Laboratory of Integrated Optoelectronics, Jilin University, Changchun 130012, China
  • Received:2020-12-10 Online:2021-04-19 Published:2021-04-27

摘要: 为提升折射率测量灵敏度、 方便测量, 通过湿腐蚀法制备了高灵敏度的 U 形塑料光纤折射率传感器。 从理论上分析了多模塑料光纤宏弯曲折射率传感器的原理, 利用射线法对塑料光纤中传输光场进行近似, 获得多模塑料光纤宏弯曲模式损耗的表达式。 采用丙酮和甲醇混合溶液作为腐蚀剂, 利用湿腐蚀法对塑料光纤进行处理, 观察不同腐蚀剂浓度腐蚀后光纤表面形貌, 得到最佳腐蚀剂浓度为丙酮浓度 80% 。 采用热定型法对腐蚀后的光纤进行宏弯曲处理, 通过改变光纤芯径及弯曲半径优化传感器性能。 利用 655 nm 红光激光器作为光源对其灵敏度进行测试, 在 1. 30 ~ 1. 45 的较大折射率范围内, 得到最佳灵敏度为618% / RIU(RIU 为折射率单位)。 实验结果证明, 通过宏弯曲处理可以使传感器灵敏度得到提升, 并且 U 形探头使测量更加方便, 可以广泛应用于折射率传感领域。

关键词: 光电子学, 光纤传感, 塑料光纤, 折射率传感器

Abstract: In order to improve the sensitivity of liquid refractive index measurement and make the measurement process more convenient, U-shaped POF(Plastic Optical Fiber) probes for RI(Refractive Index) sensing with high sensitivity is prepared by wet etching. The principle of the multi-mode POF macro-bending RI sensor is analyzed. The light field transmitted in the POF is approximated by the ray method, and the expression of mode loss caused by macro-bending in the multi-mode POF is obtained. The cladding and part of the core are removed through a mixed solution of acetone and methanol. The surface morphology of the optical fiber after corrosion with different etchant concentrations is observed, and the best etchant concentration is 80% with acetone. The corroded optical fiber is produced to macro-bending structure by thermal setting method, and the sensor performance is optimized by changing the fiber core diameter and bending radius. The sensitivity of 618% / RIU is obtained in the large index range of 1. 30 to 1. 45 at wavelength of 655 nm. It is proved that the sensitivity of the sensor can be improved through the macro-bending processing, and the U-shaped probes make the
measurement more convenient, which can be widely used in refractive index sensing.

Key words: optoelectronics, fiber optic sensors, plastic optical fibers, refractive index sensor

中图分类号: 

  • TN253