AN APPROACH FOR CORRECTING PARTICLE SIZE DISTRIBUTIONS MEASURED BY THE OPTICAL PARTICLE COUNTER WELAS 2000
The optical particle counter Welas 2000, a famous light scattering instrument for size evaluation of aerosol particles, is often calibrated with latex particles having a refractive index of 1.59. Because refractive indices of real aerosols are often less than 1.59, diameters measured by Welas 2000 will be smaller than the real ones. The aim of this paper is to develop an approach for correcting particle size distributions measured by Welas 2000 for the effect of the difference between the refractive index of particles used in the calibration of Welas 2000 and that of ambient aerosols. Based on the working principle of Welas 2000 and Mies theory, the relationship curve between scattered light intensity and particle diameter is calculated. Comparing the intensity-diameter relationship curve of particles used in the calibration of Welas 2000 with that of ambient aerosols, the real diameters of ambient aerosols will be obtained. The corrected Welas 2000 measurement results of dioctyl sebacate (DOS) droplets having a refractive index of 1.45 agree well with that of the measurement which is not sensitive to the refractive index.
Light scattering Mies theory Refractive index correction optical particle counter
B.S.Li Z.L.Ji L.Mei
Dept.of Mechanical and Electrical Engineering, China University of Petroleum, China
国际会议
西安
英文
686-689
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）