• 文献标题:   Twisted weakly coupled relative humidity sensor coated with a graphene oxide/polyvinyl alcohol composite
  • 文献类型:   Article
  • 作  者:   SUN YQ, GUO JC, XIAO YF, FAN JF, CHEN JG, ZHAO D, JIA B
  • 作者关键词:  
  • 出版物名称:   APPLIED OPTICS
  • ISSN:   1559-128X EI 2155-3165
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1364/AO.463248
  • 出版年:   2022

▎ 摘  要

A new coupled fiber optic humidity sensor based on a double-tapered fiber twisted weakly coupled structure coated with a graphene oxide/polyvinyl alcohol (GO/PVA) film has been reported for the first time, to the best of our knowledge. The sensor adopts a 2 x 2 coupler structure with a waist diameter of 20 mu m. The GO/PVA composite film is coated in the weakly coupled area to increase the sensitivity of the sensor. The thickness of the coating layer is about 3 mu m. The sensor can realize linear sensing in the relative humidity (RH) range of 45%-85%RH with a dynamic response time of 1.9 s and a recovery time of 5.7 s. The sensitivity of the sensor is up to 0.002/%RH, and the linearity of the sensor is as high as 98.65%. Moreover, the sensor has good stability, reversibility, and low-temperature crosstalk. (C) 2022 Optica Publishing Group