高速ドラムカメラの試作と衝撃波現象の観察への応用

概要

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To explore the most suitable method for measuring shock wave phenomena, we have designed and constructed a high-speed drum camera combined with a pulsed argon-ion laser as a light source. This paper presents the performance of the drum camera and its application to the observation of microexplosion-driven shock waves. A commercial air turbine drives an octagonal mirror continuously up to 220,000rpm. by changing the supply pressure to the turbine. The pulse interval of the laser is variable from 250 nsec to 2.5 msec with the fixed pulse duration of 15 nsec. In selecting the appropriate laser pulse interval and the mirror rotating speed, a framing speed of 4x10^6 fps and 40 numbers of flames can be obtained. Then the spatial resolution is 25 lines/mm at 4x10^6 fps. The present spatial resolution is excellent if compared with that of the image converter camera, whose spatial resolution is 10 lines/mm at 1x10^6 fps. More than this, the total cost of this camera was about three million yen. In order to demonstrate the usefulness of this drum camera, microexplosion-driven shock waves in air are observed. Consequently, it is found that the present microexplosion-induced spherical shock wave satisfies tne similarity law.
社団法人日本機械学会の論文
1991-02-25