轮对多通道图像采集触发技术研究

Research for multi-channel wheelset image acquisition trigger system

车辆轮对磨耗参数的检测,对保证车辆安全运行具有重要作用。针对动态检测图像采集过程中,运动车辆轮对的定位与图像采集问题,研制了适用于轮对在线检测环境的多通道图像采集触发系统。通过对所选择的车辆检测传感器性能研究,对检出信号进行了优化处理,减小了传感器检测环节引入的误差;通过采用多传感器组实现了对不同运行速度轮对进行速度检测并设计了触发控制核心电路板来实现对多路信号的集中处理;控制软件根据检测结果调整相机拍摄时间,捕捉到达设计位置的轮对图像;利用单片机自有定时中断模块设计了较高精度的软、硬件计时功能。实验及研究结果表明,该多通道图像采集触发系统运行稳定,重复性实验中的触发延时误差小于0.001 s,图像采集的效果与精度达到设计要求。

The detection of vehicle wheel set wear parameters act an important role in ensuring the safe operation of the vehicle. Aiming at the problem of precise positioning of the vehicle wheel sets in the image acquisition process of dynamic detection, a set of multichannel image acquisition trigger system was designed. Through performance research of the vehicle detecting sensor, detecting signals were optimized and the error introduced by the sensor was reduced; by using multi sensor groups, the detection of different operating speeds of the wheel set was achieved. A trigger controlling circuit board was designed to deal with multi-channel signals;to capture the wheel set image on the position, the shooting time of cameras was adjusted by the control software basing on detecting results, high precision timing function was designed by using the timer module in the microcontroller. Experiments and research results indicate that the multi-channel image acquisition trigger system is stable and the repeatable delay time error is less than 0.001 s. The effect and precision of image acquisition can meet the design requirements.