Detection Method of Dissolved Oxygen Concentration in Water Based on Time-Domain Fluorescence Lifetime

Mengdi, 涂梦迪 Tu; Gaofang, 殷高方 Yin; Nanjing, 赵南京 Zhao; Zhisong, 覃志松 Qin; Xiang, 王翔 Wang; Ming, 董鸣 Dong; Jianguo, 刘建国 Liu; Wenqing, 刘文清 Liu

doi:10.3788/aos201838.1001005

Cited by 2 publications

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“…In addition to improving the SNR and ensuring the transmission quality, the optical dissolved oxygen sensor can also use digital signal processing to calculate the dissolved oxygen concentration. Xu proposed a time-domain fluorescence lifetime-based method for dissolved oxygen detection [169]. Fluorescence was generated by periodic pulsed light excitation with a lifetime that was much longer than the fluorescence lifetime, fully ensuring that the fluorescence generated by the previous excitation completely died out before the fluorescence was generated by the next excitation.…”

Section: Intelligent Dissolved Oxygen Sensor Technologiesmentioning

confidence: 99%

“…Xu designed a method to detect dissolved oxygen, which uses a microprocessor to control the LED to generate pulsed light signals to excite the fluorescence emission, which is amplified by an amplification circuit, and finally calculates the fluorescence lifetime by comparing the fluorescence intensity of two points to obtain the concentration of dissolved oxygen. This method integrates analog signal processing technology and digital signal processing technology, and has excellent detection performance [169]. Shu used the ATmega128 microcontroller as the core to design the hardware circuit of a working system, including the design of a polarization voltage generation circuit, signal acquisition circuit, temperature compensation circuit, and serial communication circuit [176].…”

Section: Intelligent Dissolved Oxygen Sensor Technologiesmentioning

confidence: 99%

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Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Wei

Jiao

et al. 2019

Sensors

142

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Dissolved oxygen is an important index to evaluate water quality, and its concentration is of great significance in industrial production, environmental monitoring, aquaculture, food production, and other fields. As its change is a continuous dynamic process, the dissolved oxygen concentration needs to be accurately measured in real time. In this paper, the principles, main applications, advantages, and disadvantages of iodometric titration, electrochemical detection, and optical detection, which are commonly used dissolved oxygen detection methods, are systematically analyzed and summarized. The detection mechanisms and materials of electrochemical and optical detection methods are examined and reviewed. Because external environmental factors readily cause interferences in dissolved oxygen detection, the traditional detection methods cannot adequately meet the accuracy, real-time, stability, and other measurement requirements; thus, it is urgent to use intelligent methods to make up for these deficiencies. This paper studies the application of intelligent technology in intelligent signal transfer processing, digital signal processing, and the real-time dynamic adaptive compensation and correction of dissolved oxygen sensors. The combined application of optical detection technology, new fluorescence-sensitive materials, and intelligent technology is the focus of future research on dissolved oxygen sensors.

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Section: Intelligent Dissolved Oxygen Sensor Technologiesmentioning

confidence: 99%

Section: Intelligent Dissolved Oxygen Sensor Technologiesmentioning

confidence: 99%

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Wei

Jiao

et al. 2019

Sensors

142

View full text Add to dashboard Cite

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Dissolved oxygen sensor based on the fluorescence quenching method with optimal modulation frequency

Gong

Zhou

et al. 2022

Appl. Opt.

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Measurement of dissolved oxygen (DO) in liquid samples is of vital importance in both industrial and biomedical fields. In this paper, a DO sensor based on the fluorescence quenching method has been built. The measurement principle is based on fluorescence lifetime detection, which is indicated by the phase difference between an excitation light signal and a fluorescence signal. The nonlinear effect of the fluorescent material has been taken into consideration to obtain a more accurate fitting model. The performance of the system varying with the modulation frequency of excitation light signals is also reported. Modulation frequency mainly affects the sensitivity and phase resolution ratio of the system. The system at the optimized modulation frequency has a good degree of fitting with R 2 value of 0.9981 and a small relative error of 0.79%. The study shows that this kind of sensor with optimal modulation frequency has good performance, which can be used in many important fields.

show abstract

Detection Method of Dissolved Oxygen Concentration in Water Based on Time-Domain Fluorescence Lifetime

Cited by 2 publications

References 0 publications

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Dissolved oxygen sensor based on the fluorescence quenching method with optimal modulation frequency

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