抄録
To visualize the projectile acceleration process in a gas gun, a new method using the inline hologram of a slender wire is proposed and demonstrated. The hologram pattern is recorded by a streak camera via a mirror, which is moving between the wire and the recording plane. Since the miror is glued onto the nose of an accelerating projectile, Fringe spacings of the hologram pattern gradually become narrower with time due to the projectile motion. The acceleration process can he obtained precisely by analyzing the fringe spacings. It was found that (1) the acceleration time of the projectile in the launch tube of 1 m is about 14.1 ms, (2) the acceleration is almost constant except in the early stage, and (3) two kinds of oscillatory behavior of the projectile during the acceleration are recorded in the first half stage of the acceleration.
