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Proceedings Paper

Design and research on the optical sensor of dissolved oxygen in water based on fluorescence quenching
Author(s): Li Sun; Wen-yuan Dai; Jian Bao; Jin-zu Wang
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Paper Abstract

A novel optical technology for on-line monitoring of DO (Dissolved Oxygen) is reported. As a DO sensor in water, Ruthenium (II) complex (Ru(ph2phen)2+3) adsorbed on silica 60 gel particles emitted strong pink fluorescence steadily when a 470 nm wavelength blue LED (light-emitting diode) shined. The fluorescence could be quenched with molecule oxygen sufficiently; the higher DO concentration is, the weaker fluorescence intensity becomes, and the dynamic quenching processes were described by Stern-Volmer formula. Through reasonable correction and calculation, the concentration parameter of DO in water would be got. In laboratory, we used the optical sensor to measure DO concentration with oxygen-free water, oxygen-saturated water and natural water samples, and also researched the change of DO concentration in different temperatures. Experimental results show that measure range of the sensor is 0 ~ 20mg/L, and the accuracy is less than ±0.2mg. The sensor can be used on line monitoring of DO in water.

Paper Details

Date Published: 27 November 2007
PDF: 6 pages
Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67233N (27 November 2007); doi: 10.1117/12.783515
Show Author Affiliations
Li Sun, Anhui Agricultural Univ. (China)
Wen-yuan Dai, Anhui Agricultural Univ. (China)
Jian Bao, Anhui Institute of Optics and Fine Mechanics (China)
Jin-zu Wang, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 6723:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Junhua Pan; James C. Wyant; Hexin Wang, Editor(s)

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