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Sensors 2018, 18(5), 1597; https://doi.org/10.3390/s18051597

Overlap Spectrum Fiber Bragg Grating Sensor Based on Light Power Demodulation

1
Department of Electronic Information Science, Fujian Jiangxia University, Fuzhou 350007, China
2
Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou 350007, China
3
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
The authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 19 April 2018 / Revised: 10 May 2018 / Accepted: 15 May 2018 / Published: 17 May 2018
(This article belongs to the Section Physical Sensors)
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Abstract

Demodulation is a bottleneck for applications involving fiber Bragg gratings (FBGs). An overlap spectrum FBG sensor based on a light power demodulation method is presented in this paper. The demodulation method uses two chirp FBGs (cFBGs) of which the reflection spectra partially overlap each other. The light power variation of the overlap spectrum can be linked to changes in the measurand, and the sensor function can be realized via this relationship. A temperature experiment showed that the relationship between the overlap power spectrum of the FBG sensor and temperature had good linearity and agreed with the theoretical analysis. View Full-Text
Keywords: fiber Bragg grating; demodulation; overlap spectrum; temperature sensors fiber Bragg grating; demodulation; overlap spectrum; temperature sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, H.; Jiang, J.; Liu, S.; Chen, H.; Zheng, X.; Qiu, Y. Overlap Spectrum Fiber Bragg Grating Sensor Based on Light Power Demodulation. Sensors 2018, 18, 1597.

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