本研究主要的目的為製作一套高壓脈衝壓力之液體震波管。液體震波係利用水電式震波產生器在震波管的一端產生，再利用拋物面反射器將點波源方式所產生的球狀震波，匯集成沿軸向傳遞的平面震波，並利用兩個安裝在震波管管壁上的速度參考感測器量測震波的波速，以及震波管底部的壓力參考感測器量測震波壓力強度，最後和理論結果作比較。為了探討液體導電度對脈衝放電效率、震波強度及其重覆性之影響，本實驗測試了不同導電度的液體，實驗結果顯示，此設備可成功地產生強度100 MPa左右的水下震波。

　　This study aims at the development of a liquid shock tube for generating high pressure pulse. A spherical shock wave is created using a electro-hydraulic shock wave generator and then is focused to a planar shock using a parabolic reflector. The planar shock wave propagates along the shock tube. The speed of the shock is measured using two reference sensors mounted in a short distance along the tube and is used to calculate the theoretical shock strength. The shock strength is also measured directly by a pressure transducer mounted on the end plate of the tube and is compared with the theoretical results. We also explore the effect of electrical conductivity on the efficiency of electrical spark discharge which can influence the strength and the reproducibility of the shock. Experimental results show that the shock tube can successfully generate underwater shock wave of strength about 100 MPa.

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