Liquid level sensor based on an excessively tilted fibre grating

被引：51

作者：

Mou, Chengbo ^{[1
]}

Zhou, Kaiming ^{[1
]}

Yan, Zhijun ^{[1
]}

Fu, Hongyan ^{[2
]}

Zhang, Lin ^{[1
]}

机构：

[1] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England

[2] Xiamen Univ, Sch Informat Sci & Engn, Dept Elect Engn, Xiamen 361005, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2013年 / 305卷

关键词：

Level sensor; Tilted fibre grating; Fibre sensor; Fibre Bragg grating; REFRACTIVE-INDEX; SENSITIVITY; CYLINDERS; MODES;

D O I：

10.1016/j.optcom.2013.05.019

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose and demonstrate an optical liquid level sensor based on the surrounding medium refractive index (SRI) sensing using an excessively tilted fibre grating (ETFG). When the ETFG submerged in water, two sets of cladding modes are coupled, corresponding to air- and water-surrounded grating structures, respectively. The coupling strengths of the two sets of cladding modes evolve with the submerging length of the grating, providing a mechanism to measure the liquid level. Comparing with long-period fibre grating based liquid level sensor, the ETFG sensor has a much higher SRI responsivity for liquids with refractive index around 1.33 and a lower thermal cross sensitivity. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.

引用

页码：271 / 275

页数：5

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