Fig. 1. Schematic diagram of Z-type optical part

Fig. 2. Geometric relationship between deflection angle and offset

Fig. 3. Schematic diagrams of relative knife edge displacement of focal plane light source image. (a) Displacement of the light source image relative to the knife edge; (b) displacement of the knife edge relative to the light source image

Fig. 4. Schematic diagram of relative knife edge displacement of focal plane light source image

Fig. 5. The case of light passing through an axisymmetric temperature field

Fig. 6. Schematic diagram of central difference

Fig. 7. Real picture of the experimental system for measuring jet flow field

Fig. 8. Calibration images of knife edge

Fig. 9. Calibration curve of knife edge

Fig. 10. Schlieren image of the area to be measured without a flow field

Fig. 11. Two consecutive frames of schlieren images of micro turbojet tail jet field

Fig. 12. Density distribution of tail jet flow field of micro turbojet engine

Fig. 13. Velocity distribution of tail jet field of micro turbojet engine

Fig. 14. Velocity distribution of tail jet field of micro turbojet engine

Fig. 15. Pressure distribution in tail jet field of micro turbojet engine

Fig. 16. Dynamic pressure distribution of tail jet field of micro turbojet engine

Fig. 17. Dynamic pressure distribution of tail jet field of micro turbojet engine

Fig. 18. Pressure measurement of tail jet field of micro turbojet engine

Fig. 19. Comparison of two pressure measurements