Science and Technology of Energetic Materials

Vol.62, No.6 (2001)

Research paper

Precise measurements of bubble pulse by pressure sensor using fluoropolymer(*in Japanese)
Kenji Murata, Katsuhiko Takahashi, Yukio Kato, and Koichi Murai


To understand the effects of underwater explosion phenomena, as in the case of shock forming, it is necessary to accurately measure bubble pulses, as well as underwater shock waves. In the measurements of underwater explosion phenomena by a tourmaline sensor, a shift of baseline to negative pressure in the bubble pulse after the passage of shock wave is observed. The shift of the baseline makes the precise quantitative measurements of bubble pulses difficult. It is demonstrated that the pressure sensor using fluoropolymer can maintain the baseline of bubble pulse at the zero value after the passage of the shcck wave.
Precise measurements of peak pressure and impulse of the bubble pulse, as well as the underwater shock waves, were performed by the pressure sensor using fluoropolymer. The experimental results show that the peak pressure of bubble pulse is about 10 - 30 % of the peak pressure of shock wave, but the impulse of bubble pulse is about 1.5 - 2.5 times bigger than that of shock wave, in the measured scaled distance range. This is due to the fact that the duration of the bubble pulse is about ten times longer than that of the shock wave.

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