Abstract
A measurement system consisting of a Long Differential Mobility Analyzer (LDMA) and a Faraday Cup Electrometer (FCE) was developed to investigate the performance of the system for measuring the size distribution of submicron airborne particles. The LDMA was designed to have an extended classification zone in order to classify particles up to 1 μm. A new data reduction program was prepared to convert the electrical mobility distribution data obtained with the FCE into a particle size distribution. By using the program, the size distribution of TiO2 particles determined by the present system agreed with that measured by a combination of the LDMA and a condensation nucleus counter. The system was also evaluated using polydispersed, submicron SiO2 particles generated by a spray drying method. The results show that the present system performs well and is a useful tool available for measuring particles size over a wide range.
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