Fig. 1. Changes of OH_P fluorescence intensity with delay time excited by several transition lines of Q₁ series in combustion flow field

Fig. 2. Variation of OH_P yield with temperature

Fig. 3. Changes of OH_P fluorescence intensity with temperature

Fig. 4. Simultaneous temperature and velocity measurement diagram and device diagram based on OH_P. (a) Schematic drawing; (b) installation drawing

Fig. 5. Electric heating flow field simulator

Fig. 6. Comparison of temperature measurement results between two-line OH_P-PLIF and thermocouple^[25]

Fig. 7. Typical results of simultaneous measurement of temperature and velocity based on two-line OH_P-PLIF. (a) Velocity measurement results; (b) PLIF experimental image; (c) temperature measurement results; (d) velocity and temperature simultaneous display results

Fig. 8. Temperature and velocity measurements at different heights of flow field^[25]. (a) Temperature and velocity experimental image;(b) measurement results

Fig. 9. Comparison of temperature measured by F-T curve with that measured by thermocouple^[28]

Fig. 10. Temperature and velocity measurement results based on OH_P fluorescence intensity

Fig. 11. Simultaneous measurements of temperature and velocity in the flow field of a supersonic ramjet^[26]. (a) Experimental image;(b) measurement results