Fig. 1. Fluid flow state

Fig. 2. Hydrodynamic focusing principle

Fig. 3. Structure of sheath flow system

Fig. 4. Changes in focusing flow width

Fig. 5. Variation curves of focusing flow width

Fig. 6. Particle force analysis

Fig. 7. Particles flow state

Fig. 8. Particles flow trajectory

Fig. 9. Particles flowing through detection area

Fig. 10. Particle flow under different focusing flow widths

Fig. 11. Variation curves of coincidence errors