Fig. 1. DH experimental system

Fig. 2. Trailing of high-speed moving droplets

Fig. 3. The influence rate of Carmen vortex street with a wind speed of 0.7 m/s

Fig. 4. Reconstructed holograms of USAF 1951 resolution plate

Fig. 5. Measurement results of a standard particle diffraction plate at 6 mm from the focal plane

Fig. 6. Method of global digital image fusion

Fig. 7. Local tenengrad variance and determine the focus of particles

Fig. 8. Identification diagrams of droplets

Fig. 9. In three experiments，changing trends of cloud microphysical parameters observed by coaxial DH system

Fig. 10. Schematic diagram of the comparative experiment

Fig. 11. Average DSD in three experiments

Fig. 12. In in three experiments，average number concentration of three size styles of droplets：smaller，medium and oversized droplets

Fig. 13. Comparison of LWC in the third experiment

Fig. 14. Schematic diagram of the sampling transport tube of FM120