4.6 Article Proceedings Paper

Characterization of diesel particulate matter with excimer laser fragmentation fluorescence spectroscopy

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PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 29, 期 -, 页码 2767-2774

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ELSEVIER SCIENCE INC
DOI: 10.1016/S1540-7489(02)80337-6

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Excimer laser fragmentation fluorescence spectroscopy (ELFFS) is an effective technique for monitoring diesel particulate matter in engine exhaust. Measurements were made in the exhaust of a single-cylinder, 4 kW diesel generator with several different air to exhaust dilution ratios. Light from a 143 nm ArF laser photofragments the particles and produces fluorescence from the atomic carbon fragments at 248 nm and from CH (431 nm) and C-2 (468 nm) fragments. Interferences from carbon monoxide and carbon dioxide are negligible. The interference from unburned gas-phase hydrocarbons is significant when the engine is not under load, but insignificant when the engine is loaded. The gas-phase hydrocarbons can be removed by a diffusion denuder to eliminate this interference under no-load conditions. The 100-shot (I s) detection limit for particles in the exhaust is approximately 0.2 ppb volume fraction. The single-shot detection limit of ELFFS is low enough to allow for real-time monitoring of particulate matter from diesel engines, as well as from other combustion systems. ELFFS is sensitive to both the volatile and non-volatile fraction of the particulate matter, and monitoring fluorescence from multiple fragments provides information on the chemical composition of the particles.

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