Kambe K, Kuwahara M, Orikasa S, Takayama K
Department of Urology, Tohoku Univ. School of Medicine, Sendai, Japan.
Urol Int. 1988;43(5):275-81. doi: 10.1159/000281354.
The focusing of an underwater shock wave, generated by an underwater microexplosion, has been studied by several methods, such as holography, pressure measurement and pressure print. It has been shown that the shock wave could be focused within the range of a few millimeters and with an amplitude of 1 kbar. The acoustic impedances of various kinds of urinary stones were measured by the original graphical method using holographic interferrometry. The process of breaking a stone by a focused underwater shock wave was observed with high-speed cinematography. It was supposed that the main mechanism of breaking the stone is the tensile stress at the solid-water acoustic interface.
通过几种方法研究了由水下微爆炸产生的水下冲击波的聚焦情况，如全息术、压力测量和压力印记法。结果表明，冲击波可在几毫米范围内聚焦，振幅可达1千巴。使用全息干涉测量法，通过原始图形方法测量了各种尿路结石的声阻抗。用高速摄影观察了聚焦水下冲击波破碎结石的过程。据推测，结石破碎的主要机制是固 - 水声学界面处的拉应力。
