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Proceedings Paper

Demodulation of FBG sensors embedded in a fiber optic Sagnac loop
Author(s): Hyunjin Kim; JuneHo Lee; Jong-kil Lee; Minho Song
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Paper 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.

Paper Details

Date Published: 9 May 2012
PDF: 7 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 84392B (9 May 2012); doi: 10.1117/12.923243
Show Author Affiliations
Hyunjin Kim, Chonbuk National Univ. (Korea, Republic of)
JuneHo Lee, Hoseo Univ. (Korea, Republic of)
Jong-kil Lee, Andong National Univ. (Korea, Republic of)
Minho Song, Chonbuk National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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