期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 205, 期 -, 页码 186-190出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2013.10.023
关键词
Optical fiber sensor; SMS; Modal interference; Reflex index sensing; Wavelength shift measurement
资金
- National Natural Science Foundation of China [61203206, 61273059]
- Fundamental Research Funds for the Central Universities [110204002, 110604009, 110804003]
- IAPI Fundamental Research Funds [2013ZCX02-05]
A high sensitive refractive index (RI) sensor based on a Single-mode Multimode Single-mode (SMS) fiber structure was used and experimentally demonstrated. The dip in the measured spectrum signal caused by the modal interference shifted obviously when the surrounding RI changed. The approximate linear relationship between surrounding RI and spectrum dip wavelength shift was obtained experimentally. The measurement sensitivity up to 286.2 nm/RIU was showed with the surrounding RI range from 1.33 to 1.3775, which means the measurement resolution about 3.5 x 10(-6) could be implemented if the wavelength shift measurement resolution of the Optical Spectrum Analyzer is 1 pm. (C) 2013 Elsevier B.V. All rights reserved.
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