ADPを利用した高速度撮影装置

抄録

Recently, for photographing high speed phenomena, exposure time of 1 μs or less has become a matter of great concern. Hitherto, there are three ways of answering the purpose, namely, (1) the electron-optical shutter using image converter, (2) the rotating mirror and (3) the Kerr-effect shutter using nitrobenzene, but none of them is very practical. The author has been experimenting with the Kerr-effect shutter using ADP (ammonium dihydrogen phosphate) and completed a trial model of high speed camera with the performance: (1) a pulse generator supplies the ADP shutter with pulses of 0.5 or 1.0 μs in width and 8.0 kV in height, (2) the interval between input signal and 1st pulse is controlled from 1 to 20 μs and that between 1st and 3rd pulses is also from 1 to 20 μs and (3) three successive exposures are possible. 4/6μF, 30 kV spark and simultaneous explosion of fuse metal were photographed with sufficiently definable S/N-ratio and resolving power.