||Comparison of an Optical Particle Size Monitor and a Cascade Impactor for In-Stack Source Testing.
Conner, W. D. ;
Knapp, K. T. ;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Optical measuring instruments ;
Particle size ;
Size determination ;
Particle size distribution ;
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Particle size measurements by a prototype in-stack optical particle size monitor are compared to concurrent particle size measurements by an in-stack cascade impactor at three coal-fired fly ash sources. The results indicate that the optical monitor and impactor size measurements defined similar particle size distributions between 0.2 and 20 micrometers. Particles smaller than 0.2 micrometers as expected, were not observed by the optical sizer. Particles larger than 20 micrometers were also not expected to be detectable but the optical instrument may have some sensitivity to the larger-size particles. Mean size measurements by the optical instrument were always larger than similar measurements by the impactor.