Diesel particulate monitor

Chemistry: analytical and immunological testing – Oxygen containing – Inorganic carbon compounds

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436139, 436144, 436160, 436177, 422 83, 73 2331, 73 2801, 73 2804, 73 2805, 110217, G01N 1500, G01N 2176, G01N 3322

Patent

active

051107473

ABSTRACT:
Particulate concentration of diesel exhaust is measured by collecting the diesel particulate on a filter while measuring the amount of exhaust passing through the filter. The filtered particlate is then heated in an oxygen rich enviroment to oxidize carbon within the particulate to carbon dioxide. The amount of resulting carbon dioxide is measured to derive a corresponding measurement of the amount of filterd particulate. Particulate concentration is calculated by comparing the amount of particulate with the measured amount of exhaust passed through the filter. Filtered particulate can be heated incrementally to obtain a measurement of volatile components within the particulate prior to the oxidation of the non-volatile carbon component. The filter employed to collect the particulate is of a high temperature resistant type making it reusable and can be either integral with or inserted into the oxidation chamber of the instrument. Oxidation of the particulate inherently concurrently cleans the filter for reuse. Particulate can also be collected for analysis by using an accelerating impaction nozzle in conjunction with a heatable impaction plate.

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Ohta, S. et al., "Measurement of Particulate Carbon in Urban and Marine Air in Japanese Areas", ATMOS Environment, vol. 18, No. 11 1984.
Osada, H. et al, "Real-Time Measurement of Diesel Particulate Emissions by the PAS Method using a CO.sub.2 Laser", SAE Int. Congr. (Detroit Feb. 22-26, 1982 SAE Spec. Publ. N:P-107 245-251 (Feb. 1982).
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Lach, G. et al., "Specific Problems of Sampling and Measuring Diesel Exhaust Emissions", SAE Passenger Car Meet. (Dearborn, Mich. Oct. 31-Nov. 11, 1988.
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