High sensitivity liquid level sensor based on dual side-hole fiber Mach-Zehnder interferometer

被引:21
|
作者
Tian, Ye [1 ]
Tan, Tao [1 ]
Duan, Chao [1 ]
Xu, Bin [1 ]
Zhao, Xiaochen [1 ,2 ]
Chai, Quan [1 ]
Ren, Jing [1 ]
Zhang, Jianzhong [1 ]
Lewis, Elfed [1 ,3 ]
Liu, Yanlei [1 ]
Yang, Jun [1 ]
Yuan, Libo [1 ]
机构
[1] Harbin Engn Univ, Key Lab In Fiber Integrated Opt, Minist Educ, Harbin 150001, Heilongjiang, Peoples R China
[2] Harbin Engn Univ, Coll Power & Energy Engn, Harbin 150001, Heilongjiang, Peoples R China
[3] Univ Limerick, Opt Fiber Sensors Res Ctr, Limerick, Ireland
基金
中国国家自然科学基金;
关键词
Optical fiber sensor; Liquid level measurement; Optical fiber interference; Temperature compensation;
D O I
10.1016/j.optcom.2019.02.019
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A novel highly sensitive liquid-level sensor based on an asymmetric dual side-hole fiber (DSHF) using the core mode as the sensing mode and the cladding mode as the reference mode is described. The side-hole located close to the fiber core is opened by polishing and used to access the core mode as the sensing mode, the side hole located furthest from fiber core being used to tightly confine the cladding mode as the reference mode. The small core size of the DSHF further enhances the sensitivity. Pure-water-level sensitivities of 1.496 nm/mm, 2.026 nm/mm and 4.019 nm/mm are demonstrated experimentally when the distance between the DSHF core and its proximal (opened) side hole are 1.75 mu m, 1.6 mu m and 1.1 mu m, respectively. The sensor also exhibits low-temperature cross-sensitivity of similar to 0.013 mm/degrees C, similar to 0.011 mm/degrees C and similar to 0.006 mm/degrees C. The fabrication process in this case is not sensitive to the polishing process and its uniformity is determined mainly by the quality of the DSHF itself, which makes it possible to ensure repeatable fabrication. Such reliability of fabrication lends itself well to good reproducibility for potential multiple sensor unit manufacture.
引用
收藏
页码:194 / 200
页数:7
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