Based on the hydrophilic and humidity-sensitive characteristics of graphene oxide, the project combines it with optical fiber to study the real-time on-line humidity monitoring technology of optical fiber-graphene oxide. The sensor uses side polished optical fiber (SPF) as a substrate and graphene obtained by an improved oxidation-reduction method as a sensitive material. rGO is deposited in the polishing zone of SPF by natural evaporation deposition method, so that rGO interacts with optical field of optical fiber. Theoretical analysis of the sensing mechanism can explain the experimental results and show that the graphene-based optical fiber sensor can also be widely applied to the detection of other kinds of chemical gases. The experimental results show that the sensor has a linear response with sensitivity as high as 0.165 dB/%RH in the measurement range of 35% ~ 65% RH, so it has the advantages of high sensitivity and simple structure.

Huo Shihang, Tao Yuan. Optical Fiber Humidity Sensor Based on Graphene Oxide. Academic Journal of Engineering and Technology Science (2020) Vol. 3 Issue 3: 19-27. https://doi.org/10.25236/AJETS.2020.030304.

[1] Liu Zhigang, Yu Shihua, Geng Yijia, et al (2016). Design and application of SERS fiber optic sensor with solid-phase microextraction function. Spectroscopy and Spectral Analysis, S1, PP. 315-316.
[2] Xing Xiaobo, Chen Yilin, Liu Shaojing, et al (2016). Research and application of photothermal capture based on micro / nano fiber. Journal of South China Normal University (Natural Science Edition), vol 48, no. 5, pp. 15-18.
[3] Wu Xiaoxiao, Liao Wenying, Cao Xuewei, et al (2016). High birefringence characteristics of graphene-clad photonic crystal fibers. Acta Photonica Sinica, vol. 45, no. 1, pp. 106002-0106002.
[4] Yang Guang, Lou Jiachang, Han Daming, et al (2015). Passive Q-mode mode-locked erbium-doped fiber laser based on tapered fiber graphene saturable absorber . China Laser, vol. 42, s1, pp. 79 -83.
[5] Bi Weihong, Wang Xiaoyu, Fu Guangwei, et al (2015). Research progress of graphene-based optical modulators. Journal of Yanshan University, vol. 3, pp. 189-198.
[6] Hu Ping, Liu Fangfang, Huang Yan, et al (2019). Research developments in short-pulse fiber lasers based on two-dimensional materials. Laser and Infrared, vol. 049, no. 7, pp. 794-800.
[7] Xie Xiaohui, Huang Fazhong, Yue Weiwei (2019). Design of Fiber Optic Graphene FET Sensor and Its Application in pH Detection. Journal of Shandong Normal University (Natural Science Edition), vol. 034, no. 2, pp. 174-179.
[8] Chai Jing, Liu Qi, Zhang Bo, et al (2018). Research on temperature and humidity coupling of physical model materials based on fiber optic humidity sensor. Journal of Xi'an University of Science and Technology, vol. 2, pp. 210-216.
[9] Miao Jie (2017). Research on Calibration Method of HMP155A Temperature and Humidity Sensor [J]. Science and Information Technology, vol. 3, no. 031, pp  82-84.
[10] Pan Jinsheng, Li Renhui, Zhai Shuang, et al (2017). Research on monitoring system of urban box transformer based on fiber grating OPPC [J]. Electronic Quality, vol. 5, pp. 99-105.
[11] Ge Yuping (2017). Preliminary Study on Technical Problems of Fiber Optic Humidity Spherical Cavity Sensor Acquisition and Calibration Combination Device. Journal of Light Scattering, vol. 29, no. 2, pp.172-176.
[12] Li Delu, Chen Hongzhen, Zhang Gang, et al (2017). Design of traffic light timing control system based on temperature and humidity sensor. Automation and Instrumentation, vol. 7, pp.  82-83.
[13] Xiang Meiqiong, Liu Yanyang, Qing Xianguo, et al (2019). Application research of optical fiber sensing technology in nuclear power plant. Automation Instrumentation, vol. 6, pp. 132-136.