光ビ-ム・スキャナを用いた運動の実時間遠隔計測システム

概要

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Measurement of instantaneous velocities of athletes or a ball are often helpful for them to understand clearly the relationships between their body motions and the resultant performances, if essential information extracted from the measurement data is available in real time. For this purpose an optical remote measurement system was developed and its measurement capabilities were examined.A hexagonal rotatory mirror scanned horizontally a vertical slit beam at 360Hz across a measurement field of 20m in diameter. A special reflector was stuck on a moving object, which was made of numberless micro corner cubes.A photo detector aligned on the optical axis of the scanner captured reflected light just when the beam passed over a moving object. By determining the exact time of reflection via a correlation filter and an interpolation method, current object poistion along a predetermined trajectory was calculated in realtime on every 2.78ms.The system has following capabilities. Field of view: 56°, resolution: 0.06mm (at a measuring distance of 10m), 0.18mm (at 15m), accuracy: 0.7mm across the whole range. Applicability to measurement of multi objects was also investigated. By sticking a different bar coded pattern of reflector on each object, discrimination ability of the correlation method among 3 objects were examined. Discrimination among far more than 3 objects was seen possible.
公益社団法人計測自動制御学会の論文