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

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dc.contributor.author Chen, Jun
dc.contributor.author Wang, Dan-Na
dc.contributor.author Ramachandran, Arun
dc.contributor.author Chandran, Satheesh
dc.contributor.author Li, Mingzhi
dc.contributor.author Varma, Ravi
dc.date.accessioned 2020-09-17T10:07:47Z
dc.date.available 2020-09-17T10:07:47Z
dc.date.issued 2020-08-10
dc.identifier.citation Chen, 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.2020.112208 en
dc.identifier.volume 315 en
dc.identifier.startpage 1 en
dc.identifier.endpage 8 en
dc.identifier.issn 0924-4247
dc.identifier.uri http://hdl.handle.net/10468/10540
dc.identifier.doi 10.1016/j.sna.2020.112208 en
dc.description.abstract Fast 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.sponsorship National Natural Science Foundation of China (Grant No. 915442250) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier 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.uri https://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.subject Laser spectrometer en
dc.subject Nitrogen dioxide en
dc.subject Path-integrated measurement en
dc.subject Open-path sensor en
dc.subject Urban atmosphere en
dc.subject Air pollution en
dc.title An open-path dual-beam laser spectrometer for path-integrated urban NO2 sensing en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Satheesh Chandran, Physics, University College Cork, Cork, Ireland T: +353-21-490-3000 E: satheesh.chandran@ucc.ie en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 24 months after publication by request of the publisher. en
dc.check.date 2022-08-10
dc.description.version Accepted Version en
dc.contributor.funder National Natural Science Foundation of China en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Sensors and Actuators A: Physical en
dc.internal.IRISemailaddress satheesh.chandran@ucc.ie
dc.identifier.articleid 112208 en


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© 2020, Elsevier B.V. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license. Except where otherwise noted, this item's license is described as © 2020, Elsevier B.V. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.
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