Practical Use of Metal Oxide Semiconductor Gas Sensors for Measuring Nitrogen Dioxide and Ozone in Urban Environments
| Autor: | Kirsty H. Grant, Martin R. Thompson, Philip J. D. Peterson, Amrita Aujla, Roland Leigh, Joshua Vande Hey, Alex G. Brundle |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Time delay and integration
Engineering Ozone 02 engineering and technology lcsh:Chemical technology 01 natural sciences Biochemistry Article Analytical Chemistry Weather station chemistry.chemical_compound 11. Sustainability Environmental monitoring Calibration Nitrogen dioxide lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Remote sensing environmental monitoring metal oxide gas sensors business.industry 010401 analytical chemistry Repeatability 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Carbon dioxide sensor chemistry 13. Climate action 0210 nano-technology business |
| Zdroj: | Sensors, Vol 17, Iss 7, p 1653 (2017) Sensors (Basel, Switzerland) Sensors; Volume 17; Issue 7; Pages: 1653 |
| ISSN: | 1424-8220 |
| Popis: | The potential of inexpensive Metal Oxide Semiconductor (MOS) gas sensors to be used for urban air quality monitoring has been the topic of increasing interest in the last decade. This paper discusses some of the lessons of three years of experience working with such sensors on a novel instrument platform (Small Open General purpose Sensor (SOGS)) in the measurement of atmospheric nitrogen dioxide and ozone concentrations. Analytic methods for increasing long-term accuracy of measurements are discussed, which permit nitrogen dioxide measurements with 95% confidence intervals of 20.0 μ g m − 3 and ozone precision of 26.8 μ g m − 3 , for measurements over a period one month away from calibration, averaged over 18 months of such calibrations. Beyond four months from calibration, sensor drift becomes significant, and accuracy is significantly reduced. Successful calibration schemes are discussed with the use of controlled artificial atmospheres complementing deployment on a reference weather station exposed to the elements. Manufacturing variation in the attributes of individual sensors are examined, an experiment possible due to the instrument being equipped with pairs of sensors of the same kind. Good repeatability (better than 0.7 correlation) between individual sensor elements is shown. The results from sensors that used fans to push air past an internal sensor element are compared with mounting the sensors on the outside of the enclosure, the latter design increasing effective integration time to more than a day. Finally, possible paths forward are suggested for improving the reliability of this promising sensor technology for measuring pollution in an urban environment. |
| Databáze: | OpenAIRE |
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