A single-beam photothermal interferometer for in situ measurements of aerosol light absorption

dc.contributor.authorVisser, Bradley
dc.contributor.authorRöhrbein, Jannis
dc.contributor.authorSteigmeier, Peter
dc.contributor.authorDrinovec, Luka
dc.contributor.authorMočnik, Griša
dc.contributor.authorWeingartner, Ernest
dc.date.accessioned2024-01-19T06:53:08Z
dc.date.available2024-01-19T06:53:08Z
dc.date.issued2020
dc.description.abstractWe have developed a novel single-beam photothermal interferometer and present here its application for the measurement of aerosol light absorption. The use of only a single laser beam allows for a compact optical set-up and significantly easier alignment compared to standard dual-beam photothermal interferometers, making it ideal for field measurements. Due to a unique configuration of the reference interferometer arm, light absorption by aerosols can be determined directly – even in the presence of light-absorbing gases. The instrument can be calibrated directly with light-absorbing gases, such as NO2, and can be used to calibrate other light absorption instruments. The detection limits (1σ) for absorption for 10 and 60 s averaging times were determined to be 14.6 and 7.4 Mm−1, respectively, which for a mass absorption cross section of 10 m2 g−1 leads to equivalent black carbon concentration detection limits of 1460 and 740 ng m−3, respectively. The detection limit could be reduced further by improvements to the isolation of the instrument and the signal detection and processing schemes employed.
dc.identifier.doi10.5194/amt-13-7097-2020
dc.identifier.issn1867-8548
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/43695
dc.identifier.urihttps://doi.org/10.26041/fhnw-7636
dc.issue12
dc.language.isoen
dc.publisherCopernicus
dc.relation.ispartofAtmospheric Measurement Techniques
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.spatialGöttingen
dc.subject.ddc620 - Ingenieurwissenschaften und Maschinenbau
dc.titleA single-beam photothermal interferometer for in situ measurements of aerosol light absorption
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume13
dspace.entity.typePublication
fhnw.InventedHereYes
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Technikde_CH
fhnw.affiliation.institutlnstitut für Sensorik und Elektronikde_CH
fhnw.openAccessCategoryDiamond
fhnw.pagination7097-7111
fhnw.publicationStatePublished
relation.isAuthorOfPublicationb3941e6c-42c9-4e30-9d38-33d728123708
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscoveryb3941e6c-42c9-4e30-9d38-33d728123708
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