著者

内田 亮輔 平田 達也 鈴木 克則 福島 宏司 西館 啓介 久保寺 俊和 巽 瑛理 石井 将人 安孫子 德章

出版者

日本法科学技術学会

雑誌

日本法科学技術学会誌 (ISSN:18801323)

巻号頁・発行日

vol.21, no.2, pp.125-138, 2016 (Released:2016-07-23)

参考文献数

5

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Strange shaped fired bullets were found in a suicide case. While one fired casing was found in the cylinder of a Paltik revolver, one column-shaped fired bullet was found in the head of a dead man and one longer gourd-shaped fired bullet was found in the barrel of the Paltik revolver.  As a result of the gunfire test with revolvers and round-nose-cartridges, firing the revolver with a lodged (first) bullet and propellant powder in the barrel, the first bullet became column-shaped and the next bullet became a longer gourd-shaped. We had carried out X-raying the bullet's collision in the barrel, and we found out that the bullets had deformed in the barrel within a very short time. In the gunfire test, the amount of propellant powder in the barrel was larger than that in the next cartridge, so by regulating the amount of propellant powder, the velocity of the next bullet was reduced.

著者

奥村 光平 石井 将人 巽 瑛理 奥 寛雅 石川 正俊

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.49, no.9, pp.855-864, 2013 (Released:2013-10-16)

参考文献数

17

被引用文献数

5 2

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In spite of high demands in a lot of industrial fields, it is viewed as difficult to capture a stuff flying at the speed of hundreds [m/s] order same as acoustic velocity. A high-frame-rate camera (≈10000 [fps]) is often adopted to observe it. However, this method gives us only a short-lasting recorded data. Furthermore, a quite short exposure time (≈ 5 [µs]) and regionally concentrated illumination are required in order to cut down a motion blur. In this paper, a measurement means specialized for such a high-speed object is proposed. A high-speed gaze controller, called Saccade Mirror keeps its camera gaze casting the matter while soaring. We successfully obtained the longer images with brightness and a little motion blur.