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

被引:13
作者
Visser, Bradley [1 ]
Roehrbein, Jannis [1 ]
Steigmeier, Peter [1 ]
Drinovec, Luka [2 ,3 ]
Mocnik, Grisa [2 ,3 ,4 ]
Weingartner, Ernest [1 ]
机构
[1] Univ Appl Sci Northwestern Switzerland, Inst Sensors & Elect, Windisch, Switzerland
[2] Jozef Stefan Inst, Dept Condensed Matter Phys, Ljubljana, Slovenia
[3] Haze Instruments Doo, Ljubljana, Slovenia
[4] Univ Nova Gorica, Ctr Atmospher Res, Ajdovscina, Slovenia
基金
瑞士国家科学基金会;
关键词
BLACK CARBON; OPTICAL-PROPERTIES; REAL-TIME; PHOTOACOUSTIC SPECTROMETER; AMBIENT AEROSOLS; INSTRUMENT; AETHALOMETER; PARTICLES; SOOT; SPECTROSCOPY;
D O I
10.5194/amt-13-7097-2020
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
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 dualbeam 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 (1 sigma) for absorption for 10 and 60 s averaging times were determined to be 14.6 and 7.4Mm(-1), respectively, which for a mass absorption cross section of 10m(2) g(-1) 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.
引用
收藏
页码:7097 / 7111
页数:15
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