Fig. 1. Motion decomposition and projection diagram of micro-scatterers. (a) Diagram of motion decomposition; (b) motion in vertical direction and along beam propagation direction projected to Poynting vector direction

Fig. 2. Schematic of phase change after structure light interacts with moving particles

Fig. 3. Different azimuth views of rotating cylinder detected by vortex light. (a) Main view; (b) moving cylinder target detected by vortex light; (c) right view

Fig. 4. Phase distribution and intensity distribution of optical vortex. (a) Phase distribution of single-mode optical vortex; (b) phase distribution of superposition-mode optical vortex; (c) intensity distribution of optical vortex along propagation direction and transverse plane

Fig. 5. Frequency shift distribution detected by single-mode and superposition-mode optical vortex. (a) Single-mode optical vortex; (b) superposition-mode optical vortex

Fig. 6. Simulation of Doppler frequency shift bandwidth changing with beam radius

Fig. 7. Doppler frequency shift distribution around the spot ring under different radius of rotational cylinder