抄録
In order to distinguish the impulsive pressures of a liquid microjet and a shock wave, a local pressure sensor was manufactured for trial. The local pressure sensor was composed of four local pressure sensor elements, whose sensitive area was made as small as possible. Each pressure sensor element was made of a tip which was cut out of a barium titanate pressure transducer by a string saw to be 0.45 mm in width and 5 mm in length. The gap of each sensor element was filled with soft-type silicon resin to prevent their interaction of outer pressure action. By the local pressure sensor an impulsive pressure generated by the collapse of a spark-induced cavitation bubble was detected and the pressure of a water microjet was distinguished from that of a shock wave. The result was ascertained by high-speed photographs, which indicated water microjet generation in the collapsing cavitation bubble.
