High power piezoelectric axial shockwave generation

6.2 Symmetrical piezo-shock-generatorComparison of the shock profiles within the twosteel bars derived from the above mentionedsymmetrical arrangement:454035Stress (MPa)30252015Supper rodSlower rod1050-50 10 20 30 40 50 60 70 80 90 100Time (µs)Figure 9: Shock profiles of a 50 mm active length symmetricalpulse generator, electrical pulse level 500 V.Figure 8: Symmetrical pulse generator vertical arrangement.Both sides are coupled to steel bars for two sided impulseextraction. Notice the slits in casing and mounting flangessteel for getting optical access for the LDA-measurements.Timing is triggered by the transistor signal. Thedelay of the onset of the mechanical pulse is due tothe distance from shock generator to the LDAmeasuringspot on the steel bar.Take notice of the nearly identical shock profiles.The slight offset between the two pulses is due toslight differences of the distances of the LDA-spotsfrom the pulse generator.14