A fluorescent sensor for chemical analysis has a light source, an optical waveguide, and a detector. Fluorophores are associated with the optical waveguide. When an impervious waveguide is used, a fluorophore-containing layer is applied to a surface of the waveguide. The fluorophores are excited by a...http://www.google.com.au/patents/US5577137?utm_source=gb-gplus-sharePatent US5577137 - Optical chemical sensor and method using same employing a multiplicity of fluorophores contained in the free volume of a polymeric optical waveguide or in pores of a ceramic waveguide
