• Títol: Evaluation of air quality low-cost gas sensor performance under controlled variation of relative humidity and temperature
• Autor: Obando Núñez, Daniel Ricardo
• Publicació original: 2020
• Descripció física: PDF
• Nota general:
  • Colombia
• Notes de reproducció original: Digitalización realizada por la Biblioteca Virtual del Banco de la República (Colombia)
• Notes:
  • Resum: Abstract: The aim of this investigation is to assess the behavior of the low-cost sensors under different levels of temperature and relative humidity, which are the main parameters affecting their performance. Several set of experiments were carried out in both, laboratory and field conditions using four low-cost sensors from the company Alphasense. As a short summary of the experimental plan, the low-cost sensors were firstly tested under six relative humidity and four temperature levels against traditional reference instruments. This with the aim of developing a correction algorithm for these two parameters. Then the implementation of a low-cost dryer was evaluated which would reduce the influence of the mentioned parameters on the low-cost sensor behavior. All of these stated tests were performed in controlled conditions in the laboratory. In the end, a long-term experiment in the field was done. This experiment had a duration of one month, and its aim was to appraise the algorithm calculated from the laboratory when comparing their results against the concentrations measured by a monitoring station in Marienplatz, Stuttgart. The relative humidity levels achieved during the laboratory experiments were from 10% until 85%, increasing in steps of 15%, and the temperature levels were 10°C, 25°C, 35°C and 45°C. All low-cost sensors showed a significant improvement when the developed correction algorithm was applied, which is reflected in the selected evaluation parameters (MAPE, MAE, linearity and offset). The relative humidity levels used for the assessment of the low-cost dryer were 40%, 55%, 70% and 85%, finding similar results obtained from the previous experiments. However, with the advantage that in this case, after the drying process, the relative humidity and temperature levels were stable, which leads to avoid applying a complex correction algorithm. The concentrations measured by the low-cost sensors with the applied correction showed improved results, with absolute errors of 38.18 ppb, 7.64 ppb and 4.27 ppb for CO, NO and NO2, respectively. Further investigation is also suggested, regarding the use of different set of sensor for checking the reproducibility as well as dynamic changes in the influencing parameters.
  • © Derechos reservados del autor
  • Colfuturo
• Forma/gènere: Tesi
• Idioma: castellano
• Institució origen: Biblioteca Virtual del Banco de la República
• Encapçalament de matèria:
  • Low-cost sensors; Gas sensors; Air quality sensors; Electrochemical low-cost sensors; Air pollutants; Air quality monitoring
  • Tecnología; Tecnología / Ingeniería y operaciones afines

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