621 ホログラフィー干渉法を用いたレーザ集光により発生する水中衝撃波の観測(OS-4 ダイナミクス計測と診断,研究発表講演)

概要

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The shock wave in water generated by laser focusing was observed by shadowgraph method and real-time holography interferometry. For the laser focusing, YAG laser beam of output 4mJ, pulse duration 10ns was used. By the irradiation of argon laser beam of 100ns pulse duration made by acoustooptic modulator, the generating phenomenon was recorded in the CCD camera. A series of behavior of shock wave and bubble was observed by the shadowgraph method, and the shock wave velocity was measured by double pulse exposure recording. By the real-time holographic interferometry, the interference fringe pattern was recorded and the refractive index variation of the water by shock wave was analyzed by using Fourier fringe analysis. The pressure distribution of front and rear region of shock wave was calculated from the refractive index variation.
2005-03-18