iemporal measurernents of mass concentration and mean volume equivalent diarneter ofsoot particles in diesel exhaust were made simultaneously by a two-wavelength extinction method and a scattering method. It is shown that the soot rnass concentration changes dynamically depending on the variation in engine load, while the mean particle size varies within a narrow range centering 15O nm. Atheoretical approach to quantify the scattering to absorption ratio of diesel soot particles is proposed whereby the transmittance values measured at two wavelengths and electron micrographs of sampled soot particles are incorporated into the soot aggregate scatteimg theory. was flrianced by the program for pfomoting fimdarnental transport & technology research from Japan Railway Construction, Transport and Tbchnology Agency (JIUrT).This study was also supported in part by JSME-RC I89 project `℃ ontrol ofdiese] combustion to loweEemissions aRd ftiel consumption"
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