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Applying open-path FTIR with computed tomography to evaluate personal exposures. Part 1: simulation studies.
Chang-Fu Wu1, Michael G Yost, Ram A Hashmonay
1Department of Environmental and Occupational Health Sciences, Box 357234, University of Washington, Seattle, WA 98195, USA. cfwu@u.washington.edu
The Annals of Occupational Hygiene
|December 18, 2004
Summary
Computed tomography coupled with open-path Fourier transform infrared (CT-FTIR) measurements can estimate personal exposures. This simulation study shows CT-FTIR is a feasible approach for industrial hygiene monitoring.
Area of Science:
- Environmental Science
- Industrial Hygiene
- Analytical Chemistry
Background:
- Accurate personal exposure assessment is crucial for industrial hygiene.
- Computed tomography coupled with open-path Fourier transform infrared (CT-FTIR) presents a novel approach for exposure monitoring.
Purpose of the Study:
- To evaluate the feasibility of CT-FTIR for estimating personal exposures in simulated industrial environments.
- To compare different data processing strategies for CT-FTIR measurements.
Main Methods:
- Simulated one-dimensional and two-dimensional Gaussian plumes.
- Utilized computed tomography coupled with open-path Fourier transform infrared (CT-FTIR) measurements.
- Employed Smooth Basis Function Minimization algorithm for concentration profile reconstruction.
Main Results:
- Running-average and spline path-integrated concentration (PIC) updating strategies showed similar performance.
- The spline strategy resulted in delayed exposure estimates.
- The CT-FTIR approach provided reasonably good concordance (0.50-0.58) between true and estimated exposures in 2D simulations.
Conclusions:
- The CT-FTIR approach is a feasible method for industrial hygiene monitoring.
- CT-FTIR offers a promising tool for real-time personal exposure assessment.