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Proceedings Paper

Fully distributed fiber-optic sensing based on acoustically induced long-period grating
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Paper Abstract

This paper gives a review of a proposed fully-distributed fiber-optic sensing technique based on a traveling long-period grating (LPG) in a single-mode optical fiber. The LPG is generated by pulsed acoustic waves that propagate along the fiber. Based on this platform, first we demonstrated the fully-distributed temperature measurement in a 2.5m fiber. Then by coating the fiber with functional coatings, we demonstrated fully-distributed biological and chemical sensing. In the biological sensing experiment, immunoglobulin G (IgG) was immobilized onto the fiber surface, and we showed that only specific antigen-antibody binding can introduce a measurable shift in the transmission optical spectrum of the traveling LPG when it passes through the pretreated fiber segment. In the hydrogen sensing experiment, the fiber was coated with a platinum (Pt) catalyst layer, which is heated by the thermal energy released from Pt-assisted combustion of H2 and O2, and the resulted temperature change gives rise to a measurable LPG wavelength shift when the traveling LPG passes through. Hydrogen concentration from 1% to 3.8% was detected in the experiment. This technique may also permit measurement of other quantities by changing the functional coating on the fiber; therefore it is expected to be capable of other fully-distributed sensing applications.

Paper Details

Date Published: 16 May 2011
PDF: 8 pages
Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340F (16 May 2011); doi: 10.1117/12.887923
Show Author Affiliations
Dorothy Y. Wang, Virginia Polytechnic Institute and State Univ. (United States)
Yunmiao Wang, Virginia Polytechnic Institute and State Univ. (United States)
Ming Han, Virginia Polytechnic Institute and State Univ. (United States)
Jianmin Gong, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 8034:
Photonic Microdevices/Microstructures for Sensing III
Hai Xiao; Xudong Fan; Anbo Wang, Editor(s)

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