Sensors 2012, 12(9), 12377-12385; doi:10.3390/s120912377
Article

Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers

Li Liu 1 email, Yuan Gong 1,2,* email, Yu Wu 1 email, Tian Zhao 1 email, Hui-Juan Wu 1 email and Yun-Jiang Rao 1 email
1 Key Lab of Optical Fiber Sensing & Communications (Education Ministry of China), University of Electronic Science & Technology of China, Chengdu, Sichuan 611731, China 2 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, Shaanxi 710119, China
* Author to whom correspondence should be addressed.
Received: 30 July 2012; in revised form: 4 September 2012 / Accepted: 4 September 2012 / Published: 12 September 2012
(This article belongs to the Section Physical Sensors)
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Abstract: Fiber-optic interferometric sensors based on graded-index multimode fibers have very high refractive-index sensitivity, as we previously demonstrated. In this paper, spatial-frequency multiplexing of this type of fiber-optic refractive index sensors is investigated. It is estimated that multiplexing of more than 10 such sensors is possible. In the multiplexing scheme, one of the sensors is used to investigate the refractive index and temperature responses. The fast Fourier transform (FFT) of the combined reflective spectra is analyzed. The intensity of the FFT spectra is linearly related with the refractive index and is not sensitive to the temperature.
Keywords: fiber-optic sensors; graded-index multimode fiber (GI-MMF); Fabry-Perot sensor; refractive index sensor; spatial frequency multiplexing

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Cite This Article

MDPI and ACS Style

Liu, L.; Gong, Y.; Wu, Y.; Zhao, T.; Wu, H.-J.; Rao, Y.-J. Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers. Sensors 2012, 12, 12377-12385.

AMA Style

Liu L, Gong Y, Wu Y, Zhao T, Wu H-J, Rao Y-J. Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers. Sensors. 2012; 12(9):12377-12385.

Chicago/Turabian Style

Liu, Li; Gong, Yuan; Wu, Yu; Zhao, Tian; Wu, Hui-Juan; Rao, Yun-Jiang. 2012. "Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers." Sensors 12, no. 9: 12377-12385.

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