3-WAVELENGTH EXTINCTION TECHNIQUE FOR CHA RACTERIZING AEROSOLS UNDER INDUSTRIAL CONDITIONS

A new developed in-situ and on-line measuring device has been adapted to the conditions of industrial gas cleaning equipment in order to rea lize measurements of particle sizes and concentrations of aerosols. It has been used to characterize hydrochloric acid, sulphuric acid and s alt solution droplets. The measuring method is based on the three-wave length extinction technique. The results, which have been achieved wit h this method, have been compared with measurements of a particle samp ler for silizium dust and oil droplets and with chemical analysis for acid aerosols. There has been good agreement between the different mea suring techniques. The method has successfully been tested in particul ar for liquid aerosols with high particle concentrations up to 10(9) p articles/cm3.