| 摘要 |
PROBLEM TO BE SOLVED: To provide a bullet position measuring device for reducing restriction of measurement area sizes and bullet types which can be measured. SOLUTION: The bullet position measuring device includes a plurality of light generators 3a-3g linearly installed to have intervals, a light emission control part 7 for controlling light emission of the light generators, a light receiving device 5 extending to correspond to curtain-shaped lights formed by the light generators in a direction of aligning the light generators at positions facing to a plurality of the light generators, and a bullet passing position calculation part 9 for calculating a position of a bullet passing through a measuring area 13 including an area where the curtain-shaped lights formed by at least two light generators overlap each other. The light emission control part forms a plurality of groups, each of which includes a plurality of light generators at positions where the curtain-like lights does not overlap each other, to make the groups repeatedly emit light in turns at predetermined periods. The position of the bullet passing through the measuring area is calculated based on information of a position and a range of a bullet shadow obtained by light-shielding of the bullet 8 when two different light generators emit light and information of positions of the two different light generators emitting light at the time. COPYRIGHT: (C)2011,JPO&INPIT
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