E. Meyer 153 
shock wave quartz coaxial resonator 
ie] alfenuator 
Fig. 9.21. Frequency analysis of shock front spectrum with quartz hydrophone, 
heterodyne receiver 
oscilloscope 
I 2 See 2160) Innyelos | 2uysee 250 imeps 
Fig. 9.22. Frequency components of shock front as function of time. 
8 P + 
. shock front thickness 
relative amplitude x=14-10%cm 
| L %= 0.945 -10%sec 
Fu,o= 65 at 
200 400 600 1000 mcps —— 
Frequency spectrum of shock front 
pressure time-derivative 
Gaussian approximation 
0 
0 250 500 750 1000 mcps 
Fig. 9.23. Frequency spectrum of shock pressure—time derivative, Gaussian approximation, 
