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18 August 2005 Cavity ringdown spectroscopy for soot measurement in diesel exhaust
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Cavity ringdown specectroscopy (CRDS) methods have become widely used for trace gas concentration measurements as an enhanced absorption spectroscopy method. We have applied CDRS to a sample cell and simulated particulate soot to develop a CDRS system that will allow rapid measurement of soot absorption and hence density in raw diesel engine exhaust. Results will be shown from several similar systems illustrating the range of improvements available from system optimization. A final system will be shown that appears to be reasonably successful in terms of sensitivity, but is at present not able to provide reliable single-shot measurements. Illustrations of future modifications we plan to develop the single-shot capability will be shown.
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C. Wei and P. Farrell "Cavity ringdown spectroscopy for soot measurement in diesel exhaust", Proc. SPIE 5880, Optical Diagnostics, 58800O (18 August 2005);

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