In-fiber quasi-Michelson interferometer for liquid level measurement with a core-cladding-modes fiber end-face mirror

被引：34
|
作者：
Rong, Qiangzhou [1 ]
Qiao, Xueguang [1 ]
Du, Yanying [1 ]
Sun, Hao [1 ]
Feng, Dingyi [1 ]
Wang, Ruohui [1 ]
Hu, Manli [1 ]
Feng, Zhongyao [1 ]
机构：
[1] NW Univ Xian, Dept Phys, Xian 710069, Peoples R China
来源：
OPTICS AND LASERS IN ENGINEERING | 2014年 / 57卷
基金：
中国国家自然科学基金;
关键词：
Optical fibers; Quasi-Michelson interferometer; Liquid level measurement; SENSOR;
D O I：
10.1016/j.optlaseng.2013.12.010
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An in-fiber quasi-Michelson interferometer (IFQMI) working on reflection is proposed and experimentally demonstrated for liquid level measurement. The device consists of a short piece of small-core fiber (SCF) followed by a standard single-mode fiber (SMF) where its end-face is terminated by a thick silver film. A well-defined interference pattern is obtained as the result of the fiber-core mismatch and corecladding modes interference. The proposed device with a 30 mm pigtail SMF at a wavelength of 1555 nm presents a water level sensitivity of -68.3 pm/mm. Besides, the proposed device can also discriminate the refractive index (RI) of liquid measured. The IFQMI with 50 mm-long SMF provides a high RI sensitivity of -1200.61 (pm/mm)/RIU. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：53 / 57
页数：5
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