期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 290, 期 -, 页码 14-19出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2019.03.011
关键词
Fiber-optic sensor; Fabry-Perot interference; Vernier effect; Refractive index sensing
资金
- National Natural Science Foundation of China [61675132]
- Shanghai Shuguang Program [16SG40]
- Shanghai Talent Development Fund [201529]
- Shanghai Key Laboratory of Specialty Fiber Optics and Optical Access Networks [SKLSFO2014-05]
A kind of ultrasensitive refractive index sensor based on parallel-connected dual Fabry-Perot interferometers (FPIs) with Vernier effect is proposed and demonstrated. The open and closed cavity FPIs are used as the sensing and reference units, respectively. The Vernier effect is realized by superimposing the reflective comb spectra of the dual FPIs, which have slightly different free spectral ranges. The open groove of the open cavity FPI provides a convenient, efficient and economical method for filling in or draining out the cavity. The stability, repeatability and temperature response of the structures are investigated. Experimental results indicate that the proposed sensing structure features high sensitivity, good stability, quick and accurate measurement. (C) 2019 Elsevier B.V. All rights reserved.
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