Design and research on the optical sensor of dissolved oxygen in water based on fluorescence quenching

Li Sun; Wen-yuan Dai; Jian Bao; Jin-zu Wang

doi:10.1117/12.783515

27 November 2007 Design and research on the optical sensor of dissolved oxygen in water based on fluorescence quenching

Li Sun, Wen-yuan Dai, Jian Bao, Jin-zu Wang

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 67233N (2007) https://doi.org/10.1117/12.783515
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

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.

Citation Download Citation

Li Sun, Wen-yuan Dai, Jian Bao, and Jin-zu Wang "Design and research on the optical sensor of dissolved oxygen in water based on fluorescence quenching", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67233N (27 November 2007); https://doi.org/10.1117/12.783515

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KEYWORDS

Luminescence

Oxygen

Sensors

Molecules

Quenching (fluorescence)

Optical sensors

Temperature metrology

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