改性纳米二氧化钛修饰长周期光纤光栅的折射率传感特性  

Refractive index sensing of characteristics of long period fiber gratings coated with modified nano titanium dioxide particles

作　　者：赵明富[1] 聂青林 石胜辉[1] 刘志江 巫涛江 ZHAO Ming-fu;NIE Qing-lin;SHI Sheng-hui;LIU Zhi-jiang;WU Tao-jiang(Chongqing Key Laboratory of Optical fiber sensor and Photodetector,Chongqing University of Technology,Chongqing 410054,China;Chongqing Energy College,Jiangjin,Chongqing 402260,China)

机构地区：[1]重庆理工大学光纤传感与光电检测重庆市重点实验室,重庆400054 [2]重庆能源职业学院,重庆江津402260

出　　处：《光电子．激光》2021年第1期7-13,共7页Journal of Optoelectronics·Laser

基　　金：重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0093);重庆市教委科技重点项目(KJZD-K201905601);重庆市教育委员会科学技术研究项目(KJQN201801121);重庆市科技局技术创新与应用发展重点项目(cstc2019jscx-mbdxX0002);重庆理工大学研究生创新基金(ycx20192046)资助项目。

摘　　要：为进一步提高长周期光纤光栅(LPFG)的折射率灵敏度,制作了改性纳米二氧化钛粒子(TiO2)修饰LPFG的传感器。利用TiO2表面水解后产生的羟基与聚丙烯酸上的羧基结合实现对其表面进行改性,通过共价键结合方式将改性后纳米TiO2粒子固定在光栅表面构成TiO2-LPFG传感器。实验研究了该传感器对折射率和温度响应特性。结果表明,随着折射率增加,TiO2-LPFG谐振波长向短波方向迁移。在1.3333-1.4428折射率范围内,其谐振波长平均灵敏度为45nm/RIU,较裸光栅平均灵敏度提高到1.2倍;在温度30-70℃范围内的灵敏度为-0.0503nm/℃,远低于折射率灵敏度。该传感器制作成本低廉,方法简单,且其表面存在丰富的含氧官能团,在化工、生物 、医学等领域具有较好的应用价值。In order to further improve the refractive index sensitivity of long period fiber grating(LPFG),a LPFG-based sensor modified with nano titanium dioxide(TiO2) particles is fabricated.The response of sensor to external refractive index and temperature change are investigated experimentally.The hydroxyl group produced by hydrolysis of TiO2 surface was combined with carboxyl group on polyacrylic acid to achieve the modification of TiO2.The LPFG-based sensor modified with nano TiO2 particles on the fiber surface is formed by covalent bonding.The response characteristics of the sensor to refractive index and temperature are studied experimentally.The results show that the resonant wavelength of TiO2-LPFG move to shorter wavelength with the increase of refractive index.The average refractive index sensitivity of TiO2-LPFG is 45 nm/RIU in the refractive index range of 1.333 1-1.448 5,which is 1.2 times higher than that of bare grating;and the temperature sensitivity of the sensor is -0.050 3 nm/℃,which is far lower than the refractive index sensitivity.The proposed sensor has an advantage of low cost and easy to manufacture.Additionally, the enriched oxygen-containing functional groups are fixed on the surface of the sensor, making it has a wide application in the fields of biological and medical.

关 键 词：光纤传感器 长周期光栅 纳米二氧化钛 折射率传感 

分 类 号：TN253[电子电信—物理电子学]