Fig. 1. Principle of transmission schlieren system

Fig. 2. Variation of imaging area

Fig. 3. Sketch of blasting shock tube

Fig. 4. Ideal flow field evolution of blasting shock tube

Fig. 5. Unreasonable flow field of blasting shock tube

Fig. 6. Processing steps of shock wave schlieren images

Fig. 7. Layout of high-speed schlieren testing system and initial field image

Fig. 8. Time synchronization trigger module

Fig. 9. Curve of shock wave pressure

Fig. 10. Schlieren images of flow field medium arrival sensor

Fig. 11. Evolution images of nozzle shock wave and product

Fig. 12. Schlieren images of acoustic wave stripes in early explosion stages

Fig. 13. Variation of shock wave velocity with propagation distance

Fig. 14. Shock wave overpressure obtained by schlieren method and pressure sensors