Water is an important resource for socioeconomic and environmental activities. Therefore, its wellbeing should be monitored with its affordability as a key factor for its implementation. Dissolved oxygen is an important parameter to control when assessing water quality. For the preliminary study of its determination using optical techniques two samples were used. One of them had saltwater while the other had fresh water. The samples were brought to 0 % (with Na2SO3) and 100 % (with an aerator) dissolved oxygen levels. With the samples at 0 % and 100 %, a spectrophotometer was used to determine the best wavelength for the detection of variations. The results show promising differences in the blue visible light (455 nm, 460 nm, 470 nm, and 505 nm) and infrared wavelengths (950 nm). The differences for infrared light showed less dispersion and similar differences for both fresh tap water and saltwater (0.018 and 0.014 respectively). Both wavelength ranges could be useful. Three stability tests were conducted for the prototype, using a blue Light Emitting Diode and a photodiode with a Light Dependent Resistance. The Light Dependent Resistance showed interferences with the salinity; therefore, the final sensor should be isolated from the medium.
Track
Sensors: Sensors, Sensor Networks, and Applications
Conference
2nd Mosharaka International Conference on Emerging Applications of Electrical Engineering (MIC-ElectricApps 2021)
Congress
2021 Global Congress on Electrical Engineering (GC-ElecEng 2021), 10-12 December 2021, Valencia, Spain
Pages
46-51
Topics
Oceanographic Sensors Real-Time Water Quality Monitoring
ISSN
2227-331X
DOI
BibTeX
@inproceedings{1175ElecEng2021,
title={LED optical sensor prototype to determine dissolved oxygen saturation in water},
author={Aika Silveira Miura, and Mar Parra Boronat, and Jaime Lloret, and Miguel Rodilla},
booktitle={2021 Global Congress on Electrical Engineering (GC-ElecEng 2021)},
year={2021},
pages={46-51},
doi={}},
organization={Mosharaka for Research and Studies}
}
