Optical fiber humidity sensor based on the vernier effect of the Fabry-Perot interferometer coated with PVA

被引：16
作者：
Yu, Changgui [1 ]
Gong, Huaping [1 ]
Zhang, Zhaoxu [1 ]
Ni, Kai [1 ]
Zhao, Chunliu [1 ]
机构：
[1] China Jiliang Univ, Inst Optoelect Technol, Xueyuan St, Hangzhou 310018, Peoples R China
来源：
OPTICAL FIBER TECHNOLOGY | 2021年 / 67卷
关键词：
Optical fiber sensor; Vernier effect; PVA; Fabry-Perot interferometer; Humidity; HIGH-SENSITIVITY;
D O I：
10.1016/j.yofte.2021.102744
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：
In this paper, a relative humidity (RH) sensor based on vernier effect of two parallel Fabry-Perot interferometers is proposed and experimentally demonstrated. The polyvinyl alcohol (PVA) is chosen as the humidity sensitive material. The sensor consists of a reference cavity formed by single mode fiber - fiber capillary - single mode fiber (SMF-FC-SMF) structure and a sensing cavity formed by SMF-FC-coated structure. The sensor shows the high sensitivity of 1.78 nm/%RH in the range of 55%RH-85%RH. We measured the stability of the sensor at 45% RH and 75%RH, and the response time between 55%RH and 75%RH is 12 s. In addition, it also has the advantages of low temperature disturbance, simple principle, and easy manufacture.
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页数：7
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