Fig. 1. Schematic of experimental setup for laser cleaning

Fig. 2. Measured diameter of pulse laser focusing spot for cleaning

Fig. 3. Schematics of spatial distribution of laser spots. (a) Moving trail of laser spots; (b) schematic of laser spots overlap

Fig. 4. Schematics of pulse laser act on paint surface. (a) Size parameters and coordinate direction of paint surface; (b) temperature rise of paint surface

Fig. 5. Temperature elevation at the center of the spots after two adjacent pulse lasers absorbed by the paint (the initial temperature of paint is 293 K)

Fig. 6. Diagram of pulse laser cleaning

Fig. 7. Schematic of sample used in laser cleaning experiment

Fig. 8. Experimental results of ablation paint by laser

Fig. 9. Measured ablation depth at different scanning speeds. (a) Measured ablation depth; (b) standard deviations of measured ablation depth

Fig. 10. Relationship between pulse numbers acting on paint surface and ablation depth of paint

Fig. 11. Linear fitting results of pulse numbers acting on paint surface and ablation depth of paint

Fig. 12. Experimental results of ablation with different numbers of laser pulse after process adjustment

Fig. 13. Measured ablation depth at different scanning speeds after the process adjustment. (a) Measured ablation depth; (b) standard deviation of test results

Fig. 14. Linear fitting results of pulse numbers acting on paint surface and ablation depth of paint before and after the process adjustment