Fig. 1. Coordinate systems of Gaussian beam and particle

Fig. 2. Diagram of experimental light path

Fig. 3. Response waveforms and fitted curves of glass beads with different diameters. (a) Waveform corresponding to 70.0 μm diameter; (b) waveform corresponding to 48.0 μm diameter; (c) waveform corresponding to 38.5 μm diameter; (d) waveform corresponding to 19.2 μm diameter; (e) waveform corresponding to SB040104 standard glass bead

Fig. 4. Relationship between diameter and measured peak value

Fig. 5. Scattered signals at different number concentrations. (a) Number concentration 6×109 m-3; (b) number concentration is 2.4×1010 m-3; (c) number concentration is 5.1×1010 m-3

Table 1. Distributions of measured peak values of glass beads with different diameters