Title :
Sensitivity enhancement of D-fibre methane gas sensor using high-index overlay
Author :
Muhammad, F.A. ; Stewart, G. ; Jin, W.
Author_Institution :
Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK
fDate :
4/1/1993 12:00:00 AM
Abstract :
The authors determine that the sensitivity of a D-fibre methane gas sensor can be improved by overcoating the flat surface of the fibre with a high index layer. Using the finite-difference/perturbation theory technique, the enhancement factor over uncoated D-fibre is computed. The results compare favourably with those obtained from analytical expressions and the matrix method for a planar waveguide structure which models the overcoated D-fibre. From theoretical results it is concluded that the sensitivity can realistically be improved by an order of magnitude over an uncoated fibre
Keywords :
coatings; fibre optic sensors; finite difference methods; gas sensors; optical fibre theory; organic compounds; perturbation theory; refractive index; sensitivity; D-fibre methane gas sensor; chemical sensors; enhancement factor; fibre-optic sensor sensitivity enhancement; finite-difference; flat surface; high-index overlay; matrix method; overcoating; perturbation theory technique; planar waveguide structure;
Journal_Title :
Optoelectronics, IEE Proceedings J
