Open AccessTheoretical investigation for excitation light and fluorescence signal of fiber optical sensor using tapered fiber tip
Author(s) -
Yinquan Yuan,
Liyun Ding
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.021515
Subject(s) - optics , materials science , optical fiber , signal (programming language) , fluorescence , fiber optic sensor , core (optical fiber) , graded index fiber , intensity (physics) , layer (electronics) , fiber , optoelectronics , physics , computer science , composite material , programming language
For fiber optical sensor made of tapered fiber tip, the effects of the geometrical parameters of tapered tip on two important factors have been investigated. One factor is the intensity of the evanescent wave into fluorescent layer through core-medium interface; the other is the intensity of fluorescence signal transmitted from fluorescent layer to measurement end. A dependence relation of the intensity of fluorescence signal transmitted from fluorescent layer to measurement end upon the geometrical parameters of tapered tip has been obtained. Theoretical results show that the intensity of the evanescent wave into fluorescent layer rises with the decrease of the end diameter of tapered tip, and the increase of the tip length; and the transmitted power of fluorescence signal increases linearly with the increase of the tip length due to the contribution of the side area of tapered tip.