A simple fiber-optic humidity sensor based on extrinsic Fabry-Perot cavity constructed by cellulose acetate butyrate film

被引:64
作者
Xu, Wei [1 ,3 ]
Huang, Wo-Bin [1 ]
Huang, Xu-Guang [1 ]
Yu, Chang-yuan [2 ,3 ]
机构
[1] S China Normal Univ, Sch Informat & Optoelect Sci & Engn, Lab Nanophoton Funct Mat & Devices, Guangzhou 510006, Guangdong, Peoples R China
[2] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117583, Singapore
[3] Natl Univ Singapore, Res Inst, Ctr Adv Microelect Devices, Suzhou 215000, Peoples R China
关键词
Fiber optic; Fabry-Perot; Relative humidity; Thin-film; RELATIVE-HUMIDITY;
D O I
10.1016/j.yofte.2013.09.005
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A fiber-optic relative humidity sensor with an extrinsic micro Fabry-Perot cavity constructed with a thin layer of cellulose acetate butyrate coated on a fiber end is presented. Its operational principle is based on the relative-humidity-dependent wavelength shift of the interference fringes formed by Fresnel reflections from both interfaces of the thin film. Both the experimental and theoretical analyses are investigated in detail. The experimental data for relative humidity ranging from 8.8% to 88.1% are measured in the both humidification and dehumidification processes, which fits the linear equation very well with a value of R-2 = 0.9946. As observed, it shows a high sensitivity of 0.307 nm/%RH with a high resolution of 0.06%. The time-dependent response of the sensor is estimated. The long term stability of the sensor is also addressed with high precision of +/-0.03% over 100 min. The proposed relative humidity sensor has a simple, solid, and compact structure. (C) 2013 Elsevier Inc. All rights reserved.
引用
收藏
页码:583 / 586
页数:4
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