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

研制了一种用于户外运动的光学测量系统，并对其精度进行了测试。玩家加速、减速或速度的时间信号包含了许多有助于分析玩家运动的信息。特别是如果测量数据是实时获得的，并且分析结果是在玩家玩游戏时反馈给他们的，那么玩家就会发现将自己的动作与最终的表现联系起来是非常容易的。运动分析中常用的视频分析在这方面似乎无能为力，首先，视频摄像机的空间分辨率太低，无法满足覆盖直径大于40m的大型户外场地的要求。其次，在现有设备条件下，实时图像分析在技术上存在困难。代替摄像机，一对多边形波束扫描仪被用来水平扫描整个测量场。一个特殊的反射器附在一个移动的物体上。水平位置是根据物体的反射光返回探测器的时间来计算的。垂直位置由位置传感装置（PSD）测量。在水平方向上，距离30 m时空间分辨率为0.3 mm，距离45.5 m时空间分辨率为3.6 mm。垂直分辨率在14.4米处为1.2毫米，在20米处为4.9毫米。

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.