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Title:A single-beam photothermal interferometer for in situ measurements of aerosol light absorption
Authors:Visser, Bradley (Author)
Röhrbein, Jannis (Author)
Steigmeier, Peter (Author)
Drinovec, Luka (Author)
Močnik, Griša (Author)
Weingartner, Ernest (Author)
Files:.pdf Visser_-_AMT_2020_-_A_single-beam_photothermal_interferometer_for_in_situ_measurements_of_aerosol_light_absorption.pdf (2,44 MB)
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:We 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.
Keywords:aerosol, aerosol absorption, black carbon, photo-thermal interferometer, climate change
Year of publishing:2020
Number of pages:7097-7111
Numbering:13, 2020
COBISS_ID:44630531 Link is opened in a new window
DOI:10.5194/amt-13-7097-2020 Link is opened in a new window
License:CC BY 4.0
This work is available under this license: Creative Commons Attribution 4.0 International
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Title:Atmospheric Measurement Techniques
Shortened title:Atmos. Meas. Tech.
Year of publishing:2020