Develppment of a remote realtime measurement system for outdoor sports using optical beam scanners

研制了一套用于户外运动的光学测量系统，并对其精度进行了测试。运动员的加速、减速或速度的时间信号包含了大量的信息，这些信息有助于分析运动员的运动。特别是在实时获得测量数据并将分析结果反馈给玩家的情况下，玩家会发现非常容易将他的动作与结果表现联系起来。通常用于运动分析的视频分析对此似乎无能为力，因为首先，摄像机的空间分辨率太低，无法满足上述要求，无法覆盖直径大于40m的大片户外场地。其次，用现有设备进行实时图像分析在技术上是困难的。用一对多边形束扫描器来水平扫描测量场，而不是摄像机。一个特殊的反射器被固定在一个移动的物体上。水平位置是从物体反射的光返回到探测器的时间开始计算的。通过位置传感装置(PSD)测量垂直位置，水平方向的空间分辨率在30m处为0.3 mm，在45.5m处为3.6 mm，垂直分辨率在14.4m处为1.2 mm，在20m处为4.9 mm。

An optical measurement system has been developed its accuracy was tested for uses of out door sports. Temporal signal of acceleration, deceleration, or velocity of players includes a lot of information which is helpful to analyze players' motion. Especially in case that data of measurement is obtained in real time and results of analysis is fedback to the player during his play, the player would find it very easy to relate his motion to the resultant performance. Video analysis, which is commonly used in movement analyses, seems helpless for this purpose, since first, spatial resolution of video camera is too poor to satisfy the requirements mentioned above in order to cover a big out door field with a diameter of larger than 40m. Second, realtime image analysis is technically difficult with current equipments.Instead of videocameras, a pair of polygon beam scanners were employed to scan horizontally across a mesurement field. A special reflector was attached to a moving object. The horizontal position was calculated from the time when the reflected light from the object returned to a detector. Vertical position was measured by the position sensing device (PSD).Spatial resolution in horizontal direction proved to be 0.3 mm at a distance of 30 m, and 3.6 mm at 45.5 m. Vertical resolution proved to be 1.2 mm at 14.4 m and 4.9 mm at 20 m.