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A dissolved oxygen(DO)sensor based on U-shape plastic optical fiber(POF)and dichlorotris(1,10- phenanthroline)ruthenium([Ru(dpp)~3]~(2+))as an oxygen indicator was described.Fluorescence intensity and lifetime were measured when the sensor was soaked into a water bath blasted with air with varied O_2/N_2 ratios.The influence of Ru concentration,annealing time and U-shaped POF curve radius on the system sensitivity was also studied.A two-layer model was proposed to analyze the deviation from linear relation described by Stern-Volmer equation,and to explain the deviation and the dependence of the fluorescence on curvature of U-shape POF.By fitting the experimentally measured sub-linear relation ofτ_0/τratio versus oxygen concentration,the proportion of effectively sensitive layer and the Stern-Volmer coefficient can be evaluated to be f=0.59 and K_(SV)=0.61 typically.
A dissolved oxygen (DO) sensor based on U-shape plastic optical fiber (POF) and dichlorotris (1,10- phenanthroline) ruthenium ([Ru (dpp) ~3] ~ (2 +)) Fluorescence intensity and lifetime were measured when the sensor was soaked into a water bath blasted with air with varied O_2 / N_2 ratios. The influence of Ru concentration, annealing time and U-shaped POF curve radius on the system sensitivity was also studied. A two -layer model was proposed to analyze the deviation from linear relation described by Stern-Volmer equation, and to explain the deviation and the dependence of the fluorescence on curvature of U-shape POF.By fitting the experimentally measured sub-linear relation ofτ_0 / τratio versus oxygen concentration, the proportion of effectively sensitive layer and the Stern-Volmer coefficient can be evaluated as be f = 0.59 and K_ (SV) = 0.61 typically.