中文摘要：

以轨道交通轮对参数在线检测中的图像采集为背景，针对车辆轮对快速运动时曝光时间短曝光量不足的问题，提出一种具有高精度同步闪光功能的图像采集方法。设计了曝光、闪光同步时序，采用高亮度闪光光源来保证光通量，通过光电耦合器和单片机对触发信号进行处理，利用高精度的延时控制模块来调节曝光、闪光起始时刻。设计并实现了异步图像采集功能，保证车辆轮对运动到预设位置时能够精确地曝光和闪光。分析了同步误差的影响因素，通过实验验证，当运行速度不高于80 km/h时系统的同步误差小于25μs，运动模糊小于1 mm。

英文摘要：

On the background of the image of online detection of rail transport wheel-set parameters,a kind of high accurate synchronization flash image acquisition method was proposed in order to solve the problem of short exposure time and lack of exposure when the vehicle wheel-set moving fast. The exposure and flash time sequence was designed in synchronous timing, using high-intensity flash light to ensure luminous flux. Trigger signal was processed by optical coupler and MCU. And with high-precision delay control module, the exposure and flash moments could be controlled. Asynchronous image acquisition was designed and realized so that a clear image can be acquired accurately when the wheel-set arrives at the position set in advance. The influencing factors of the synchronization error were analyzed. According to the results of experiment, when the speed is less than 80 km/h, the synchronization error of the system would be less than 25μs and the motion blurred would be less than 1 mm.