Fig. 1. Optical path diagram of laser Doppler velocimeter system

Fig. 2. Dual-beam and dual-scattering optical path analysis model

Fig. 3. Doppler signal processing flowchart

Fig. 4. Adaptive sampling flowchart

Fig. 5. Zoom-FFT spectrum refinement logic diagram

Fig. 6. Comparison chart of relative errors between fixed sampling frequency and adaptive sampling algorithm

Fig. 7. Accuracy verification chart of the energy centrobaric correction algorithm

Fig. 8. Comparison chart of relative error before and after spectrum thining

Fig. 9. Experimental platform

Fig. 10. Laser velocimeter calibration equipment

Fig. 11. Error in length measurement stability