期刊
IEEE SENSORS JOURNAL
卷 19, 期 21, 页码 9775-9781出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2929072
关键词
Optical fiber sensors; Temperature measurement; Temperature sensors; Lead; Optical fiber testing; Fiber optic sensor; hybrid modal interferometer; bias-taper; simultaneous measurement; joint wavelength and intensity demodulation
资金
- National Natural Science Foundations of China [61675066, 61302075]
- Natural Science Foundations of Heilongjiang Province [QC2015068]
- Heilongjiang Postdoctoral Scientific Research Development Foundations of China [LBH-Q15117]
- Heilongjiang Creative Talents Plan, China [UNPYSCT-2017117]
- Graduate Innovation Research Project of Heilongjiang University [YJSCX2019-163HLJU]
- Outstanding Youth Science Foundations of Heilongjiang University
An in-fiber hybrid modal interferometer (HMI) is theoretically and experimentally demonstrated in a section of bias-tapered multimode fiber only fabricated by arc-discharge technique, which consists of multimode interferometer (MMI) and Mach-Zehnder interferometer (MZI). The MZI has the sensitivity as high as -31.08 nm/RIU, but the MMI presents the immunity of both wavelength and intensity to ambient refractive index (RI). In strain test, MMI has a 9.8-dB intensity deduction and MZI shows high wavelength sensitivity (-6.31 pm/mu epsilon). Thus, our HMI shows a strong multi-parameter discriminative proficiency and simultaneous measurement of RI, strain and temperature is achieved by the means of joint wavelength and intensity demodulation-based inversion-matrix method. Such a compact and low-cost sensor, without the crosstalk from the temperature and the light source, is very promising for the applications of biochemical sensing and structural health monitoring.
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