An In Situ Dissolved Oxygen Monitoring System Based on Fluorescence Quenching Phase Detection

Abstract:

As a major indicator in marine life research and geochemistry, the in-situ monitoring of dissolved oxygen has become increasingly important in the assessment of marine ecosystem. It has been proved that fluorescence quenching may result in shorter fluorescence lifetime. Based on it, this paper proposes an in-situ dissolved oxygen monitoring system of high precision and low power consumption applicable to long-term monitoring of complex marine environment. Using phase detecting method, an AC analog amplification channel on Precision photoelectric detection, and used digital phase detection method and three order integral average method to detect the phase offset. The ultralow-power microcontroller was used to control system. The experiments results show that the system has high stability, high precision(0.02mg/L), quick response time(≤40s), low power consumption(peak current ≤10mA), strong anti interference ability.

• Periodical: Advanced Materials Research (Volumes 588-589)
• Pages: 968-973
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.588-589.968
• Online since: November 2012
• Authors: Tao Zhang, Shu Ming Ye, Ji Yu Han, Jun Feng Liu
• Keywords: Dissolved Oxygen (DO), Fluorescence Quenching, In Situ, Low Power Consumption, Phase-Detect

References

[1] LI. Wen-long, JING. Miao, Wang. Zheng, and Wang. Xiao-ru, Development and application of Dissolved Oxygen Abakyzer Based on Fluorescence Quenching Principle, Advances In Marine Science 2007, 25(3).

[2] LI. WEI, CHEN. XI, ZHUANG. Zhixia, SUN. Dahai, and WANG Xiaoru, On-line Monitoring of Dissolved in Water bu a Fiber-optic Chemical Sensor Based on Fluorescence Quenching, ACTA Scientiarum Naturalium Universitatis Pekinensis 2001, 37(2).

[3] C. McDonagh B.D. MacCraith, andA.K. McEvoy, Tailoring of Sol-Gel Films for Opitcal Sensing of Oxygen in Gas and Aqueous Phase, Analytical Chemistry 1998 70(1).

DOI: 10.1021/ac970461b

[4] Zhao. Shiwei, AI. Wei, and LIU. Xiao-dong, Opitcal fiber oxygen sensor based on phase-detect thchnology, Journal of Transducer Technology 2002, 21(12).

[5] GUO. Li-quan, ZHANG. Yu-jun, YIN. Gao-feng, and WANG. Zhi-gang, Design of dissolved oxygen oxygen detecting system based on fluorescence lifetime method, Transducer and Microsystem Technologies2011, 30(10).

[6] Jiang. Desheng, Zhao. Shiwei, Han. Yun, Yue. Fangyu, and Huang. Jun, Optic Fiber Oxygen Sensor Based on Fluorescence Quenching , ACTA OPTICA SINICA 2003, 23(3).

[7] Fenghong Chu, Haiwen Cai, Ronghui Qu, and Zujie Fang, A Dissolved Oxygen Sensor Based on Ruthenium Fluorescence and U-shaped Plastic Optical Fiber, Proc. of SPIE Vol. 6781.

DOI: 10.3788/cjl20083508.1220