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

Dorothy Y. Wang; Yunmiao Wang; Ming Han; Jianmin Gong; Anbo Wang

doi:10.1117/12.887923

16 May 2011 Fully distributed fiber-optic sensing based on acoustically induced long-period grating

Dorothy Y. Wang, Yunmiao Wang, Ming Han, Jianmin Gong, Anbo Wang

Proceedings Volume 8034, Photonic Microdevices/Microstructures for Sensing III; 80340F (2011) https://doi.org/10.1117/12.887923
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

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.

Citation Download Citation

Dorothy Y. Wang, Yunmiao Wang, Ming Han, Jianmin Gong, and Anbo Wang "Fully distributed fiber-optic sensing based on acoustically induced long-period grating", Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340F (16 May 2011); https://doi.org/10.1117/12.887923

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KEYWORDS

Acoustics

Hydrogen

Coating

Fiber optics sensors

Biosensing

Fiber coatings

Platinum

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