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Localizing gaseous fugitive emission sources by combining real-time optical remote sensing and wind data.

Authors
Hashmonay-RA; Yost-MG
Source
J Air Waste Manage Assoc 1999 Nov; 49(11):1374-1379
NIOSHTIC No.
20030000
Abstract
This paper presents the theoretical background and the numerical evaluation results obtained using computed tomography coupled with open-path Fourier transform infrared (CT-FTIR) measurements to estimate personal exposures. In this simulation study, we first tested the one-dimensional scenario with a five-beam segment geometry. A series of Gaussian plumes and the corresponding path-integrated concentrations (PICs) were simulated. The personal exposures were estimated as the average of the point estimates calculated from the workers' locations and the concentration profiles reconstructed from the Smooth Basis Function Minimization algorithm. It was found that the running-average PIC updating strategy has similar performance as the spline PIC updating strategy. However, the latter strategy gives delayed estimates of the workers' exposures since it requires additional measurements before and after the time period of interest. In the two-dimensional scenario, we simulated a series of single-mode bivariate Gaussian plumes with a nine-beam radial geometry. The average of the estimated exposures from the CT-FTIR approach was close to the average of the true exposures. The concordance correlation factors between the true and estimated exposures were reasonably good (between 0.50 and 0.58). This study demonstrated that the CT-FTIR approach is feasible for industrial hygiene monitoring.
Keywords
Exposure-levels; Exposure-assessment; Simulation-methods; Workers; Computer-models; Humans; Mathematical-models; Models
Contact
Department of Environmental Health, University of Washington, Seattle, WA
CODEN
AIWAE2
Publication Date
19991101
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002660
Issue of Publication
11
ISSN
1096-2247
Source Name
Journal of the Air and Waste Management Association
State
WA
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