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Abstract

An optical instrument was developed that is based on a two-wavelength extinction principle and is used to measure the temporal mass concentration of soot aggregates in diesel exhaust. Two laser beams in coaxial alignment transmit a gas sample flow and the transmittances at two wavelengths are measured simultaneously. The specific extinction is determined by a comparison of mass concentrations measured at steady operation conditions by both the extinction and paper filter methods. The soot mass concentration is calculated from the measured transmittance value using the specific extinction obtained. It is demonstrated by experiments with two EURO III direct injection diesel engines that the developed instrument is able to measure the soot mass concentration under transient modes. A theoretical approach to quantify the ratio of scattering to absorption of diesel soot aggregates is proposed whereby the transmittance values measured at two wavelengths and electron micrographs are incorporated into the soot aggregate scattering theory. The refractive index of the diesel soot aggregates is finally determined so that the measured specific absorption could fit a calculated one.

Keywords

diesel engine particulate emissions laser diagnostics extinction method

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Temporal measurements of mass concentration of soot aggregates in diesel exhaust by a two-wavelength extinction method

Abstract

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