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Proceedings Paper

Fiber Bragg grating cladding mode resonance liquid-level sensor
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Paper Abstract

A Fiber-optic liquid-level sensor based on etched fiber Bragg grating (FBG) cladding mode resonance is proposed and demonstrated both theoretically and experimentally. The theoretical model of the FBG cladding mode liquid-level sensor is built under a three-layer step-index fiber geometry. Response of cladding mode resonance spectra to the variation of ambient liquid level are studied and simulated numerically with couple mode theory and transmission matrix method. In the experiments, a chemical etching method is adopted to diminish the fiber cladding diameter and increase the sensitivity of cladding mode resonances to the ambient refractive index change. Dependences of FBG cladding mode resonance spectra on the liquid-level variation are measured and the experiments data match the model well.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750374 (5 October 2009); doi: 10.1117/12.834217
Show Author Affiliations
Na Chen, Southeast Univ. (China)
Shanghai Univ. (China)
Binfeng Yun, Southeast Unv. (China)
Yiping Cui, Southeast Unv. (China)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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