title: Polymer optical fiber Bragg grating acting as an intrinsic biochemical concentration sensor.
abstract: We demonstrate an intrinsic biochemical concentration sensor based on a polymer optical fiber Bragg grating. The water content absorbed by the polymer fiber from a surrounding solution depends on the concentration of the solution because of the osmotic effect. The variation of water content in the fiber causes a change in the fiber dimensions and a variation in refractive index and, therefore, a shift in the Bragg wavelength. Saline solutions with concentration from 0% to 22% were used to demonstrate the sensing principle, resulting in a total wavelength shift of 0.9 nm, allowing high-resolution concentration measurements to be realized.
authors.affiliation: Photonics Research Group, Aston University, Birmingham B4 7ET, UK. w.zhang@aston.ac.uk
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: David
authors.initials: D
authors.lastname: Webb
authors.forename: Gangding
authors.initials: G
authors.lastname: Peng
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D055100:Optical Fibers; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013997:Time Factors
chemical_list: D019904:Polymethyl Methacrylate