Temperature-Insensitive Refractometer Based on a Wave-Shaped Fiber Modal Interferometer Using No-Core Fiber

被引：7
作者：
Kim, Taeyoon [1 ]
Jung, Junha [1 ]
Lee, Jinho [1 ]
Lim, Geun Weon [1 ]
Lee, Ju Han [1 ]
机构：
[1] Univ Seoul, Sch Elect & Comp Engn, Seoul 02504, South Korea
来源：
IEEE SENSORS JOURNAL | 2021年 / 21卷 / 14期
基金：
新加坡国家研究基金会;
关键词：
Optical fiber sensors; multimodal Interference; refractive index measurement; temperature insensitive; MACH-ZEHNDER INTERFEROMETER; REFRACTIVE-INDEX; OPTICAL-FIBER; SENSOR; CURVATURE; FBG;
D O I：
10.1109/JSEN.2021.3075473
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：
We propose a novel, temperature-insensitive fiber optic sensor for refractive index (RI) measurement. Our refractometer is based on multimodal interference in a wave-shaped configuration with localized reverse curvature, which is composed of a concatenating standard single-mode fiber (SMF)-no-core fiber (NCF)-SMF structure. The wave-shaped fiber optic refractometer is composed of an SMF-NCF-SMF combination, in which the length of the NCF located at the top of the structure, is only 4 mm. The main wave-shaped fiber has a curvature of 20 m(-1), while the wave-shaped NCF section has a curvature of -0.0055 m(-1). The NCF section with no polymer coating, which acts as a sensing head, is modified to have a curvature opposite to the curvature of the whole wave-shaped optical fiber, by applying localized external pressure. The RI measurement sensitivity of our proposed refractometer was estimated at approximately -53.24 nm/RIU, while its temperature sensitivity was 0 pm/degrees C.
引用
收藏
页码：16066 / 16077
页数：12
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