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In-Situ Simultaneous Monitoring of Water Stage and Water Quality Using Fiber Optic Sensors
Oral Presentation
Prepared by Y. Huang1, G. Chen2, H. Xiao3
1 - North Dakota State University, Dept. # 2470, PO Box 6050, Fargo, ND, 58108
2 - Missouri University of Science and Technology, Department of Civil, Architectural, and Environmental Engineering, Rolla, MO, 65401
3 - Missouri University of Science and Technology, Department of Electrical and Computer Engineering, Rolla, MO, 65401
Contact Information: ying.huang@ndsu.edu; 701-231-7651
ABSTRACT
The water quality in rivers and streams is continuously altering because of unexpected changes from climate, land function, and population growths, resulting in large environmental uncertainty such as changes in soil tempera¬ture, atmospheric deposition, and even vegetation patterns. To accurately track these environmental influences and have sufficient follow-ups to prevent potential environmental hazards, an in-situ continuous water-quality monitoring system is proven to help. Traditional in-situ water-quality monitoring system collects detail water-quality related information such as temperature, specific conductance, dissolved oxygen, and pH data. These systems usually only provide periodical data collection and require complex sensor combination for overall water quality evaluation. On the other hand, advanced in-situ optical water-quality sensing systems, with unique features of compact size, high frequency, real-time and multi-parameter sensing capacity, could provide potential solutions for early warning of water-quality deterioration and science-based decision support. In this study, an optical in-situ simultaneous monitoring system for water stage, overall water quality, and the temperature is developed using long-period fiber grating (LPFG) optical fiber sensors. When part of the LPFG sensor is submerged in water, the resonant wavelength of each cladding mode of the LPFG sensor varied linearly with the submerged length (refer to water stage) and temperature, and nonlinearly with refractive index changes (referred to the water quality). Two resonant wavelengths were used to relate the water stage and overall water quality to the change in resonant wavelengths of the LPFG sensor. Sharing the same fiber line, one sequential glass packaged LPFG is used to monitor the temperature changes of the water at the same location as the other LPFG sensor. A simple algorithm for simultaneous determination of the water stage, overall water quality, and temperature was analytically formulated and experimentally validated. Benefit from the multi-parameter sensing using one single fiber line, the developed optical sensing network can potentially provide a low-cost, real-time, and high resolution solution for the in-situ water quality monitoring.
Oral Presentation
Prepared by Y. Huang1, G. Chen2, H. Xiao3
1 - North Dakota State University, Dept. # 2470, PO Box 6050, Fargo, ND, 58108
2 - Missouri University of Science and Technology, Department of Civil, Architectural, and Environmental Engineering, Rolla, MO, 65401
3 - Missouri University of Science and Technology, Department of Electrical and Computer Engineering, Rolla, MO, 65401
Contact Information: ying.huang@ndsu.edu; 701-231-7651
ABSTRACT
The water quality in rivers and streams is continuously altering because of unexpected changes from climate, land function, and population growths, resulting in large environmental uncertainty such as changes in soil tempera¬ture, atmospheric deposition, and even vegetation patterns. To accurately track these environmental influences and have sufficient follow-ups to prevent potential environmental hazards, an in-situ continuous water-quality monitoring system is proven to help. Traditional in-situ water-quality monitoring system collects detail water-quality related information such as temperature, specific conductance, dissolved oxygen, and pH data. These systems usually only provide periodical data collection and require complex sensor combination for overall water quality evaluation. On the other hand, advanced in-situ optical water-quality sensing systems, with unique features of compact size, high frequency, real-time and multi-parameter sensing capacity, could provide potential solutions for early warning of water-quality deterioration and science-based decision support. In this study, an optical in-situ simultaneous monitoring system for water stage, overall water quality, and the temperature is developed using long-period fiber grating (LPFG) optical fiber sensors. When part of the LPFG sensor is submerged in water, the resonant wavelength of each cladding mode of the LPFG sensor varied linearly with the submerged length (refer to water stage) and temperature, and nonlinearly with refractive index changes (referred to the water quality). Two resonant wavelengths were used to relate the water stage and overall water quality to the change in resonant wavelengths of the LPFG sensor. Sharing the same fiber line, one sequential glass packaged LPFG is used to monitor the temperature changes of the water at the same location as the other LPFG sensor. A simple algorithm for simultaneous determination of the water stage, overall water quality, and temperature was analytically formulated and experimentally validated. Benefit from the multi-parameter sensing using one single fiber line, the developed optical sensing network can potentially provide a low-cost, real-time, and high resolution solution for the in-situ water quality monitoring.