Fig. 1. Simulated signal from a 5 µm diameter particle. (a) Temporal signal; (b) phase profile.

Fig. 2. Chart diagram of CWT-HT signal processing algorithm for particle-induced SMI signal.

Fig. 3. Schematic of SMI system.

Fig. 4. Signal burst of 2 µm PS particle. (a) Raw SMI signal (black), denoised SMI signals by BPF (red) and CWT (blue); (b) scalogram of CWT.

Fig. 5. Phase profiles of the 2 µm PS particle SMI signal by BPF (red) and CWT (blue).

Fig. 6. Signal bursts of the PS particles in different diameters after CWT denoising. (a) 500 nm; (b) 3 µm; (c) 4 µm; (d) 5 µm.

Fig. 7. Phase curve as a function of the particle diameter. The blue circle marks represent the mean values and the standard deviations of the measured value of phase Φ. The black line and red solid line denote the simulation results and the linear fitting.