High sensitivity optical fiber liquid level sensor based on a compact MMF-HCF-FBG structure

被引：25

作者：

Zhang, Yunshan ^{[1
]}

Zhang, Weigang ^{[1
]}

Chen, Lei ^{[1
]}

Zhang, Yanxin ^{[1
]}

Wang, Song ^{[1
]}

Yan, Tieyi ^{[1
]}

机构：

[1] Nankai Univ, Inst Modern Opt, Minist Educ, Key Lab Opt Informat Sci & Technol, Tianjin 300350, Peoples R China

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2018年 / 29卷 / 05期

基金：

中国国家自然科学基金;

关键词：

liquid level sensor; wavelength demodulation; hollow-core fiber; temperature compensation;

D O I：

10.1088/1361-6501/aaac5c

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An ultra-high sensitivity fiber liquid level sensor based on wavelength demodulation is proposed and demonstrated. The sensor is composed of a segment of multimode fiber and a large aperture hollow-core fiber assisted by a fiber Bragg grating (FBG). Interference occurs due to core mismatching and different modes with different effective refractive indices. The experimental results show that the liquid level sensitivity of the sensor is 1.145 nm mm(-1), and the linearity is up to 0.996. The dynamic temperature compensation of the sensor can be achieved by cascading an FBG. Considering the high sensitivity and compact structure of the sensor, it can be used for real-time intelligent monitoring of tiny changes in liquid level.

引用

页数：6

共 24 条

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