Journal of Xidian University ›› 2020, Vol. 47 ›› Issue (2): 54-59.doi: 10.19665/j.issn1001-2400.2020.02.008

Previous Articles     Next Articles

Optical fiber relative humidity sensor using the hydroxyethyl cellulose hydrogel film

LI Jinze,ZHANG Jianqi,Sun Hao()   

  1. School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
  • Received:2019-07-06 Online:2020-04-20 Published:2020-04-26
  • Contact: Hao Sun E-mail:hsun@xidian.edu.cn

Abstract:

In order to demonstrate the feasibility of hydroxyethyl cellulose hydrogel as an optical fiber sensor moisture sensitive material, a new optical fiber humidity sensor based on hydroxyethyl cellulose is proposed. First, a hollow-core fiber(150μm) is fused to a single mode fiber. Second, a 10μm thick hydroxyethyl cellulose hydrogel film is coated on the end face of the hollow-core fiber. Finally, the proposed humidity sensor is placed in a constant temperature and humidity chamber for a humidity response test. Experimental results show that this sensor has good humidity response characteristics and only needs 2.75s from 35%-85% RH, with the RH sensitivity being 224.5pm/%RH. As a good moisture sensitive material, hydroxyethyl cellulose has a good application prospect in various humidity sensors.

Key words: optical fiber sensor, relative humidity, hydroxyethyl cellulose, hollow-core fiber

CLC Number: 

  • TN253