基于荧光猝灭原理的海洋原位溶解氧传感器及定量标定算法

doi:10.3976/j.issn.1002-4026.2021.02.001

Shandong Science ›› 2021, Vol. 34 ›› Issue (2): 1-10.doi: 10.3976/j.issn.1002-4026.2021.02.001

• Oceanographic Science, Technology and Equipment • Next Articles

Development of marine in situ dissolved oxygen sensor based on fluorescence quenching and its quantitative calibration algorithm

YUAN Da，FENG Xian-dong，ZHANG Yun-yan，WU Bing-wei

National Engineering and Technological Research Center of Marine Monitoring Equipment,Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Technology，Institute of Oceanographic Instrumentation, Qilu University of Technology(Shandong Academy of Sciences)，Qingdao 266061, China

Received:2020-09-18 Online:2021-04-13 Published:2021-04-13

Abstract

Abstract: To meet the demand of in situ accurate monitoring of seawater dissolved oxygen using a domestic sensor, an optical seawater dissolved oxygen sensor was developed using modulation-demodulation digital quadrature lock-in amplification detection technology. The developed sensor achieved accurate detection of weak fluorescence lifetime. The dissolved oxygen sensor temperature coefficient was calibrated through polynomial regression analysis. A polynomial quantitative algorithm model of the fluorescence phase, dissolved oxygen concentration, and temperature was established to achieve the accurate detection of dissolved oxygen. Under a random temperature and dissolved oxygen concentration within the calibration test temperature range, the temperature measurement accuracy of the sensor is ±0.1 ℃ and the accuracy of dissolved oxygen measurement is ±0.1 mg/L after calibration.

Key words: fluorescence quenching, optical dissolved oxygen sensor, digital phase-locked amplification, calibration

CLC Number:

YUAN Da, FENG Xian-dong, ZHANG Yun-yan, WU Bing-wei. Development of marine in situ dissolved oxygen sensor based on fluorescence quenching and its quantitative calibration algorithm[J].Shandong Science, 2021, 34(2): 1-10.

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Development of marine in situ dissolved oxygen sensor based on fluorescence quenching and its quantitative calibration algorithm

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