Fig. 1. Experimental principle of the laser transmission in a wind tunnel^[42]

Fig. 2. Influence of the wind speed on the average beam deflection. (a) Airflow interval is 0.45 m; (b) airflow interval is 1.38 m; (c) airflow interval is 2.31 m^[42]

Fig. 3. Correlation imaging experimental device under different wind speeds^[49]

Fig. 4. Imaging results under different wind speeds. (a)--(d) Correlation imaging experiment results under different wind speeds; (e) experiment and simulation results under different wind speeds; (f) experiment and simulation results under different sampling times^[49]

Fig. 5. Correlation imaging scheme under high-speed airflow^[49]

Fig. 6. Correlation imaging results under different wind speeds. (a) M=0.5Ma; (b) M=1.5Ma; (c) M=2Ma; (d) M=3Ma^[49]

Fig. 7. Influence of different boundary layer thicknesses on imaging results when M=1.5Ma. (a) Boundary layer thickness is 20 mm; (b) boundary layer thickness is 80 mm; (c) boundary layer thickness is 150 mm^[49]

Fig. 8. Influence of wind speed and turbulence intensity on image quality^[49]

Fig. 9. Experimental setup of the correlation imaging for detecting trembling^[52]

Fig. 10. Imaging results of the trembling in different directions. (a) x direction; (b) y direction^[52]

Fig. 11. Imaging results under different trembling conditions. (a) No trembling; (b) irregular trembling^[52]

Fig. 12. Object information detection method and detection results. (a) Flow chart of the object area detection. (b)--(c) center of the object area under different imaging intervals; (d) SNR of the reconstructed target under different imaging intervals^[52]

Fig. 13. Reconstructed image of the target. (a) No trembling; (b) with trembling; (c) imaging result of the improved algorithm; (d) imaging result of the cross-correlation algorithm^[52]