Fig. 1. Schematic diagram of polarization nephelometer device

Fig. 2. Image of PSL particles from polarization nephelometer. (a) Image of the background; (b) image of low-level PSL scattered light; (c) image of high-level PSL scattered light; (d) image of PSL scattered light after noise reduction

Fig. 3. Observations results of WPS. (a) Particle size concentration of particulate matter; (b) mass concentration of particulate matter

Fig. 4. SEM images of PSL standard particle samples. (a) Original image; (b) enlarged image of SEM

Fig. 5. Statistics of PSL particle size by SEM

Fig. 6. Comparison of measured and theoretical scattering phase functions for PSL. (a) Polarization angle is 0 °; (b) polarization angle is 90 °

Fig. 7. Comparison of theoretical and measured values of PSL particle scattering phase function. (a) Polarization angle is 0 °; (b) polarization angle is 90 °

Fig. 8. Inversion results of PSL particle size distribution