Highly Sensitive Humidity Sensor Based on a GO/Co-MOF-74 Coated Long Period Fiber Grating

作者：Yan, Jingci; Feng, Jijun^*; Ge, Jinman; Chen, Jian; Wang, Feng; Xiang, Caiwei; Wang, Ding; Yu, Qinghua; Zeng, Heping

来源：IEEE Photonics Technology Letters, 2022, 34(2): 77-80.

DOI：10.1109/LPT.2021.3139114

• Humidity
• Optical fiber sensors
• Sensitivity
• Refractive index
• Optical fibers
• Optical device fabrication
• Fiber gratings
• Co-MOF-74
• graphene oxide (GO)
• humidity sensor
• long period fiber grating (LPFG)

A humidity sensor based on graphene oxide (GO)/Co-MOF-74 coated long period fiber grating is experimentally demonstrated. The long period fiber grating is prepared by CO2 laser direct writing method, with GO/Co-MOF-74 composite humidity sensitive material coated around the grating region. Combination of GO and Co-MOF-74 with porous structure can absorb water molecules effectively and improve the sensitivity. A high humidity sensitivity of 0.204 nm/%RH can be realized in the RH range of 30-50% as well as a value of 0.16 dB/%RH in the range of 50-90%, both with a linearity of more than 0.98. The proposed highly sensitive humidity sensor also shows a good performance in the stability and repeatability.

• 单位
  中国科学院