Optical fibre Fabry-Perot relative humidity sensor based on HCPCF and chitosan film
Optical fibre Fabry-Perot relative humidity sensor based on HCPCF and chitosan film
复制标题
基于HCCPF和壳聚糖薄膜的光纤法布里-珀罗相对湿度传感器
DOI：
10.1080/09500340.2016.1167974
复制
发表时间：
2016-01-01
影响因子：
1.3
通讯作者：
Geng, Xiangyi
中科院分区：
文献类型：
--
作者：
Liu, Xiaohui;Jiang, Mingshun;Geng, Xiangyi
提出了一种光纤法布里-珀罗干涉仪（FPI）相对湿度传感器。FPI是通过将一小段空芯光子晶体光纤（HCPCF）拼接到单模光纤上，并在HCPCF的末端覆盖一层壳聚糖薄膜而形成的。壳聚糖的折射率和膜厚会随着环境湿度的变化而变化，从而导致FPI的反射干涉光谱发生变化。对FPI传感器的RH响应进行了理论分析和实验验证。它对35 - 95%RH的RH值有非线性响应。随着相对湿度的增加，干涉条纹向短波长方向移动，在高相对湿度下，干涉条纹的最大灵敏度为0.28nm/%RH。条纹对比度随相对湿度的增加而减小，最大灵敏度为0.5dB/%RH。该传感器具有良好的稳定性和快速的响应时间小于1 min。该传感器具有结构紧凑、性能优良、制作简单、安全等优点，在湿度传感领域具有很大的应用潜力。
An optical fibre Fabry-Perot interferometer (FPI) sensor for relative humidity (RH) measurement is proposed. The FPI is formed by splicing a short section of hollow-core photonic crystal fibre (HCPCF) to single mode fibre and covering a chitosan film at the end of HCPCF. The refractive index of chitosan and film thickness will change with ambient RH, leading to the change in the reflected interference spectrum of FPI. RH response of the FPI sensor is analysed theoretically and demonstrated experimentally. It shows nonlinear response to RH values from 35 to 95% RH. The interference fringe shifts to shorter wavelength as RH increases with a maximum sensitivity of 0.28 nm/%RH at high RH level. And the fringe contrast also decreases as RH increases with an available maximum sensitivity of 0.5 dB/%RH. The sensor shows good stability and fast response time less than 1 min. With its advantages of compact structure, good performance, simple and safe fabrication, the proposed optical fibre FPI sensor has great potential for RH sensing.