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RADIAL COMPUTED TOMOGRAPHY OF AIR CONTAMINANTS USING OPTICAL REMOTE SENSING
Citation:
Hashmonay, R. A., K. Wagoner, D. F. Natschke, D B. Harris*, AND E L. Thompson*. RADIAL COMPUTED TOMOGRAPHY OF AIR CONTAMINANTS USING OPTICAL REMOTE SENSING. Presented at A&WMA Annual Conference, Baltimore, MD, 6/23-27/02.
Description:
The paper describes the application of an optical remote-sensing (ORS) system to map air contaminants and locate fugitive emissions. Many ORD systems may utilize radial non-overlapping beam geometry and a computed tomography (CT) algorithm to map the concentrations in a plane. In the computational study, the new radial CT (RCF) beam is compared to an ideal conventional CT geometry using the same reconstruction algorithm, number of beams, and pixel resolution. It was demonstrated that the quality of reconstructions for the RCT configuration is at least comparable to that for the classical CT (CCT) configuration. However, applying the radial beam geometry is preferred for simplicity and cost considerations. In the experimental field simulation study, path integrated concentration (PIC) data collected using a scanning open-path Fourier transform infrared (OP-FTIR) instrument in the radial beam geometry were reconstructed. We applied a conventional CT algorithm, multiplicative algebraic reconstruction technique, to the RCI beam geometry, and showed that a controlled point source location may be accurately determined. This new approach is much more applicable than the CCT approach and could vastly broaden the applications of many optical remote-sensing instruments.