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Sensors 2015, 15(8), 18579-18586; doi:10.3390/s150818579

Multi-Stress Monitoring System with Fiber-Optic Mandrels and Fiber Bragg Grating Sensors in a Sagnac Loop

Division of Electronics and Information Engineering, Chonbuk National University, Jeonju 561-756, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 18 June 2015 / Revised: 28 July 2015 / Accepted: 28 July 2015 / Published: 29 July 2015
(This article belongs to the Section Physical Sensors)
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Abstract

Fiber Bragg grating sensors are placed in a fiber-optic Sagnac loop to combine the grating temperature sensors and the fiber-optic mandrel acoustic emission sensors in single optical circuit. A wavelength-scanning fiber-optic laser is used as a common light source for both sensors. A fiber-optic attenuator is placed at a specific position in the Sagnac loop in order to separate buried Bragg wavelengths from the Sagnac interferometer output. The Bragg wavelength shifts are measured with scanning band-pass filter demodulation and the mandrel output is analyzed by applying a fast Fourier transform to the interference signal. This hybrid-scheme could greatly reduce the size and the complexity of optical circuitry and signal processing unit, making it suitable for low cost multi-stress monitoring of large scale power systems. View Full-Text
Keywords: fiber Bragg grating; Sagnac interferometer; attenuator fiber Bragg grating; Sagnac interferometer; attenuator
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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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MDPI and ACS Style

Kim, H.; Sampath, U.; Song, M. Multi-Stress Monitoring System with Fiber-Optic Mandrels and Fiber Bragg Grating Sensors in a Sagnac Loop. Sensors 2015, 15, 18579-18586.

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