Demodulation of FBG sensors embedded in a fiber optic Sagnac loop

Hyunjin Kim; JuneHo Lee; Jong-kil Lee; Minho Song

doi:10.1117/12.923243

9 May 2012 Demodulation of FBG sensors embedded in a fiber-optic Sagnac loop

Hyunjin Kim, JuneHo Lee, Jong-kil Lee, Minho Song

Proceedings Volume 8439, Optical Sensing and Detection II; 84392B (2012) https://doi.org/10.1117/12.923243
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

For condition monitoring of large scale electrical power transformers, a fiber-optic multi-stress sensor system was constructed by combining fiber-optic acoustic sensors and fiber Bragg grating temperature sensors in a fiber-optic Sagnac interferometer. To separate the grating signals from the interferometer output, an attenuator was placed at an asymmetrical position in the Sagnac loop. By balancing the counter propagating light intensities with the attenuator, the background noises could be suppressed to obtain grating signals with enough signal-to-noise ratio. With the preliminary experiments, the temperature and the vibration information at multiple locations could be measured simultaneously with single optical circuit and signal processing unit.

Citation Download Citation

Hyunjin Kim, JuneHo Lee, Jong-kil Lee, and Minho Song "Demodulation of FBG sensors embedded in a fiber-optic Sagnac loop", Proc. SPIE 8439, Optical Sensing and Detection II, 84392B (9 May 2012); https://doi.org/10.1117/12.923243

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