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Proceedings Paper

Modeling and experimental investigation of the coupling efficient of a fiber-capillary fluorescent sensor
Author(s): Zhong Pan; Min Li; Li Hua; Yulin Li
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Paper Abstract

An evaluation model is proposed to estimate the fluorescence coupling efficiency of a small, capillary-shape fiber sensor, which takes advantage of the analysis approach for the coupling efficiency from a point lightsource to a fiber. To confirm the validity of the theoretical model, a group of 4 fiber-capillary units with increasing diameters and lengths are made and demonstrate with FITC solution. Both simulation and experiment results show that a triangle-arrangement of two excited fibers and one receiving fiber gives the best coupling efficiency of a capillary-shape fiber probe with a fixed diameter. The coupling efficiency is inversely proportion to the refractive index and attenuation coefficient of the fluorophore solution, besides being direct proportion to the core diameter R and the N.A., i.e., sinθ(θ is the receiving angle), of the receiving fiber within the distance from the fiber end to the limit decided by R/tanθ, and a fluorescence efficiency of 0.8% is demonstrated.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83511Y (30 January 2012); doi: 10.1117/12.914252
Show Author Affiliations
Zhong Pan, Wuhan Univ. of Technology (China)
Min Li, Wuhan Univ. of Technology (China)
Li Hua, Wuhan Univ. of Technology (China)
Yulin Li, Wuhan Haomai Photonics Technology Co., ltd. (China)

Published in SPIE Proceedings Vol. 8351:
Third Asia Pacific Optical Sensors Conference
John Canning; Gangding Peng, Editor(s)

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