An open-path dual-beam laser spectrometer for path-integrated urban NO2 sensing

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dc.contributor.authorChen, Jun
dc.contributor.authorWang, Dan-Na
dc.contributor.authorRamachandran, Arun
dc.contributor.authorChandran, Satheesh
dc.contributor.authorLi, Mingzhi
dc.contributor.authorVarma, Ravi
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.date.accessioned2020-09-17T10:07:47Z
dc.date.available2020-09-17T10:07:47Z
dc.date.issued2020-08-10
dc.description.abstractFast and continuous in-situ monitoring of NO2 in urban air using optical sensing has been a topic of research recently. Due to possible interferences from other absorbers, spectroscopic measurements across a broad absorption band of NO2 are preferred over single-wavelength laser absorption measurements for specificity. While, in general, broadband spectrometers account for spectral interferences and exhibit high selectivity, laser spectrometers possess faster responses and higher sensitivity. In this study, we present an open-path and dual-beam laser absorption spectrometer (OP-DBLS) featured as sensitive, accurate and cost-effective urban NO2 monitor with fast and easy operation. This instrument consists of two lasers operating at wavelengths close to the NO2 absorption peak around 405 nm and the ratio of absorption at these wavelengths were used to remove cumulative influence of all broad baseline features such as aerosol interferences. The instrument was continuously operated for thirteen days at the middle ring road monitoring centre located in the northeast of Shanghai, P. R. China. The measurements were compared with concurrent measurements by a Chemiluminescence (CL) detector and the correlation of campaign-averaged hourly measurements depicting diurnal variations in NO2 concentrations was found to be ∼0.8. Furthermore, results from comparison against four other air quality monitors deployed elsewhere in the city showed excellent consistency.en
dc.description.sponsorshipNational Natural Science Foundation of China (Grant No. 915442250)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid112208en
dc.identifier.citationChen, J., Wang, D.-N.,Ramachandran, A.,Chandran, S., Li, M. and Varma, R. (2020) 'An open-path dual-beam laser spectrometer for path-integrated urban NO2 sensing', Sensors and Actuators A: Physical, 315, 112208 (8pp). doi: 10.1016/j.sna.2020.112208en
dc.identifier.doi10.1016/j.sna.2020.112208en
dc.identifier.endpage8en
dc.identifier.issn0924-4247
dc.identifier.journaltitleSensors and Actuators A: Physicalen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/10540
dc.identifier.volume315en
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.rights© 2020, Elsevier B.V. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectLaser spectrometeren
dc.subjectNitrogen dioxideen
dc.subjectPath-integrated measurementen
dc.subjectOpen-path sensoren
dc.subjectUrban atmosphereen
dc.subjectAir pollutionen
dc.titleAn open-path dual-beam laser spectrometer for path-integrated urban NO2 sensingen
dc.typeArticle (peer-reviewed)en
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