| 摘要 |
<p>A method for determining size and composition of a particulate matter in a fume flow produced by a combustion process. A polarized laser light beam (5) is projected through the fume flow and the scattered light from the fume flow is gathered in a sideward scattering direction and in at least one forward scattering direction (S2; S2, S3). For each of these scattering directions (S1, S2; S1, S2, S3), the gathered light is separated into two polarized light components on the planes parallel and orthogonal to the scattering direction (S1, S2; S1, S2, S3), the light intensity of each of the polarized light components is measured and a scattered light polarization ratio (PR1, PR2; PR1, PR2, PR3) is calculated as a function of the measured light intensities of the polarized light components. The size (D) of the particulate matter and the unburnt carbon percentage (C) in the particulate matter are determined as a function of the calculated scattered light polarization ratios (PR1, PR2; PR1, PR2, PR3).</p> |
