On the Error Due to the Window Width of Particle Size Analyzer in the Measurement of Particle Penetration through an Air Filter

概要

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A particle size analyzer with multiple size channels has a finite window width in each channel. It is possible that the error in the subsequent data analysis results from the finite window width, even if the particle size analyzer measures the size distribution with sufficient accuracy. In order to estimate the error, a numerical experiment was made as an example on the measurement of particle penetration through the air filter. The error was found to be negligible only around two positions of the most penetrating particle size through the filter and the count median diameter of test particles. As the particle size in question separated from these positions, a difference between the theoretical penetration and the experimental increased. The difference also increased in proportion to the window width. In the multistage filtration system, it was found that the filter performance was underestimated, as the particle penetration through each filter increased at each successive filter.