期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 222, 期 -, 页码 159-165出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.07.098
关键词
Optical fiber sensor; Tapered fiber; Mach-Zehnder interferometer; Refractive index measurement; High sensitivity
资金
- National Natural Science Foundation of China [61203206]
- Fundamental Research Funds for the Central Universities [N140405001]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120042120038]
- National Science Foundation for Distinguished Young Scholars of China [61425003]
- State Key Laboratory of Synthetical Automation for Process Industries [2013ZCX09]
- Natural Science Foundation of Hebei Province [F2014501137]
- Natural Science Foundation of Liaoning Province [2013020010]
A novel refractive index sensor with high sensitivity based on Mach-Zehnder interferometer formed by cascaded two single-mode fiber tapers was proposed and experimentally demonstrated. The dip of the measured spectrum signal caused by Mach-Zehnder interference shifted obviously when the surrounding refractive index changed. The approximate linear relationship between surrounding refractive index and spectrum dip wavelength shift was obtained experimentally. The measurement sensitivity up to 158.4 nm/RIU was showed with the surrounding RI ranged from 1.33 to 1.3792, which meant the measurement resolution about 6.3 x 10(-6) could be implemented if wavelength shift measurement resolution of the optical spectrum analyzer is 1 pm. Meanwhile, its ease of fabrication makes itself a low-cost alternative to existing sensing applications. (C) 2015 Elsevier B.V. All rights reserved.
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