Simultaneous Measurement of Refractive Index and Temperature Using a Cascaded FBG/Droplet-Like Fiber Structure

被引：48
作者：
Chen, Yaofei [1 ]
Han, Qun [1 ]
Liu, Tiegen [2 ]
Liu, Fangchao [1 ]
Yao, Yunzhi [1 ]
机构：
[1] Tianjin Univ, Coll Precis Instrument & Optoelect Engn, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Coll Precis Instrument & Optoelect Engn, Minist Educ, Key Lab Optoelect Informat Technol, Tianjin 300072, Peoples R China
来源：
IEEE SENSORS JOURNAL | 2015年 / 15卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Optical fiber sensors; refractive index; temperature; Bragg grating; droplet-like structure; MACH-ZEHNDER INTERFEROMETER; MODAL INTERFEROMETER; FBG; SENSOR; STRAIN; TAPER;
D O I：
10.1109/JSEN.2015.2450361
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 simple and compact sensor based on a cascaded fiber Bragg grating (FBG)/droplet-like fiber structure is proposed for simultaneous measurement of refractive index (RI) and temperature. The sensor can be easily constructed by mechanically bending a section of coating-stripped single-mode fiber at an FBG's pigtail. In the transmission spectrum, two kinds of dips induced by FBG and droplet-like structure are observed. The central wavelength of the dip caused by droplet-like structure is susceptible to both of surrounding RI and temperature, while that caused by FBG is only dependent on temperature. A sensor with a 9.5-mm diameter of droplet-like structure is fabricated and experimentally studied. The experimental results demonstrate the feasibility of the proposed sensor and show that sensor possesses a high RI sensitivity of 157.8891 nm/RIU for the RI range from 1.3330 to 1.3785 and a temperature sensitivity of 10.3 pm/degrees C.
引用
收藏
页码：6432 / 6436
页数：5
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