High sensitivity humidity sensor based on gelatin coated side-polished in-fiber directional coupler

被引：59

作者：

Yang, Jing ^{[1
]}

Guan, Chunying ^{[1
]}

Yu, Zengxi ^{[1
]}

Yang, Min ^{[1
]}

Shi, Jinhui ^{[1
]}

Wang, Pengfei ^{[1
]}

Yang, Jun ^{[1
]}

Yuan, Libo ^{[1
]}

机构：

[1] Harbin Engn Univ, Coll Sci, Minist Educ, Key Lab InFiber Integrated Opt, Harbin 150001, Heilongjiang, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2020年 / 305卷

基金：

中国国家自然科学基金;

关键词：

Optical fiber sensor; Relative humidity sensor; In-fiber directional coupler; Hole-assisted fiber; Dual-core fiber; U-SHAPED MICROFIBER; KNOT RESONATOR; INTERFEROMETER; SILICA;

D O I：

10.1016/j.snb.2019.127555

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We demonstrate the first experimental realization of in-fiber directional coupler-based relative humidity (RH) sensor. A segment of single eccentric hole-assistant dual-core fiber (SEHADCF) is directly spliced between two single mode fibers (SMFs) to realize an in-fiber directional coupler (IFDC), and the suspended core of the SEHADCF is exposed to the external environment by using the side-polishing process. Gelatin is covered on the exposed suspended core to form the cladding of the suspended core and acts as a humidity sensitive material. Compared to the previous literatures, we report the highest sensitivity of the RH sensor to our best knowledge. In the RH range of 70 %-90 %, the average and maximum RH sensitivities are -7.005 nm/%RH and -18.94 nm/%RH, respectively. In addition, the temperature response and stability of the IFDC is also experimentally measured. Due to the super-high sensitivity and low temperature crosstalk, the proposed sensor will be expected to be a promising candidate for highly sensitive RH sensing applications in high humidity environment.

引用

页数：7

共 28 条

[1] Relative Humidity Sensor Based on a Few-Mode Microfiber Knot Resonator by Mitigating the Group Index Difference of a Few-Mode Microfiber [J].