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Angular illumination and truncation of three different integrating nephelometers: Implications for empirical, size-based corrections

Title
Angular illumination and truncation of three different integrating nephelometers: Implications for empirical, size-based corrections
Authors
Muller T.Nowak A.Wiedensohler A.Sheridan P.Laborde M.Covert D.S.Marinoni A.Imre K.Henzing B.Roger J.-C.Dos Santos S.M.Wilhelm R.Wang Y.-Q.De Leeuw G.
Ewha Authors
김용표
SCOPUS Author ID
김용표scopus
Issue Date
2009
Journal Title
Aerosol Science and Technology
ISSN
0278-6826JCR Link
Citation
vol. 43, no. 6, pp. 581 - 586
Indexed
SCI; SCIE; SCOPUS scopus
Abstract
Integrating nephelometers are widely used for monitoring and research applications related to air pollution and climate. Several commercial versions of the instrument are available and are in wide use in the community. This article reports on results from a calibration and intercomparison workshop where several units of the three most widely used nephelometer models were tested with respect to their CO2 calibration accuracy and stability and non-idealities of their angular illumination function. Correction factors that result from the non-ideal illumination due to truncation of the sensing volumes in the near-forward and near-backward angular ranges and for non-Lambertian illumination from the light sources are presented, in particular for two models that have not previously been tested in this respect. The correction factors ranged from 0.95 to 1.15 depending on the model of nephelometer and aerosol size distribution. Recommendations for operational data analysis in context of these and previous performance tests are presented.
DOI
10.1080/02786820902798484
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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