Theoretical analysis of the evanescent wave absorption coefficient for multimode fibre-optic evanescent wave absorption sensors |
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| Authors: | Yu Xu N. Barrie Jones John C. Fothergill Chris D. Hanning |
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| Affiliation: | 1. Engineering Department , University of Leicester, Engineering Department, University of Leicester , University Road, Leicester, LE1 7RH, UK Phone: 0116-2522673 Fax: 0116-2522673 E-mail: yx2@leicester.ac.uk;2. Department of Anaesthesia , Leicester General Hospital , Leicester, LES 4PW |
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| Abstract: | Abstract In an optical fibre of circular cross section, leaky skew rays transmit power in a different way from trapped and meridional rays. In this paper, a theoretical analysis of the evanescent wave absorption coefficient for leaky skew rays in multimode optical fibre evanescent wave absorption sensors is presented. Further, a comprehensive expression for the effective evanescent wave absorption coefficient is obtained. Some numerical results are given to illustrate this theoretical analysis. This work could be applied to optimize the design of fibre-optic evanescent wave absorption sensors. |
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