Fig. 1. Schematic diagram of planar laser induced fluorescence imaging

Fig. 2. Measurement results of OH/acetone-PLIF/PIV. (a) Mean velocity vectors and (b) instantaneous OH-PLIF image^[29]

Fig. 3. Radial diagram of acetone-PLIF in a rotating detonation engine^[30]

Fig. 4. Comparison of OH-PLIF and CH-PLIF images in a cavity-stabilized scramjet combustor^[33]

Fig. 5. Schematic diagram of experimental set-up for OH measurement of 1-8 atmospheres lean premixed natural gas flames^[18]

Fig. 6. Schematic diagram of PLIF-PIV turbulent jet lift flame measurement. (a) Experimental setup; (b) jet burner; (c) imaging region^[44]

Fig. 7. High-speed OH-PLIF system with refrequency of 50 kHz^[47]

Fig. 8. 20 kHz, CH₂O -PLIF/PIV experimental setup^[48]

Fig. 9. Burst mode experimental setup and measurement results^[50]. (a) 7.5 kHz, OH/CH₂O-PLIF experimental setup; pluse energy residuals for (b) 355 nm and (c) 283 nm pluse

Fig. 10. Diagram of the 10 kHz biplane PIV and OH-PLIF experimental setups^[51]. (a) Layout of experimental optical path; (b) aerial view of light path of the burner

Fig. 11. OPO Ultraviolet laser experimental equipment^[52]

Fig. 12. Experimental setup for seed injection of burst-mode OPO UV lasers^[53]

Fig. 13. Experimental setup for 50 kHz PLIF based on OPO and frequency doubling method^[54]

Fig. 14. Schematic diagram of experimental setup for ultra-high-speed simultaneous OH and CH₂O-PLIF^[55]

Fig. 15. Schematic of the three-legged burst-mode laser system^[56]

Fig. 16. Schematic diagram of the high-speed OH-PLIF experimental setup. (a) MHz pump source optical path^[57]; (b) OPO-burst OH-PLIF based rotary burst combustion experimental setup; (c) OPO optical path diagram^[58]

Fig. 17. Femtosecond OH-PLIF detector^[59]

Fig. 18. OH-PLIF experiment setup with Ti: sapphire. (a) 283 nm UV laser based on titanium gemstone triplex realisation; (b) Bunsen burner detection results^[60]