铁路限界检测可控频闪光源测距方法

发布时间：2018-05-15 08:49

本文选题：限界检测 + CMOS相机　；参考：《铁道科学与工程学报》2017年03期

【摘要】：针对目前铁路限界检测存在的效率低和精度低等问题,提出采用多个CMOS相机结合可控频闪光源测距的限界检测方法。将测距系统安装在列车端部,动态偏移量系统与测速系统安装在列车底部,三者之间同步控制。根据摄像机成像原理,定义合理坐标系,建立单相机限界检测数学模型,并根据参数的特殊性简化模型。列车运行过程中,调节光源的频闪频率与相机的曝光时间,同一物体可以在一帧图像中周期成像,通过图像处理,得出周期成像的平均距离,不同距离的物体成像的平均距离不同,结合列车频闪周期内运行距离以及相机焦距可以计算限界距离。在此基础上,设计出一套测距设备,并在试验台上进行实验验证。研究结果表明,提高光源的闪光频率,测试误差随之减小,为限界检测的在线实验提供了依据。
[Abstract]:Aiming at the problems of low efficiency and low precision in railway boundary detection at present, a method of limit detection based on multiple CMOS cameras combined with controllable stroboscopic light source is proposed. The ranging system is installed at the end of the train, the dynamic offset system and the velocity measuring system are installed at the bottom of the train, and the three systems are controlled synchronously. According to the principle of camera imaging, the reasonable coordinate system is defined, and the mathematical model of limit detection of single camera is established, and the model is simplified according to the particularity of parameters. In the course of train operation, by adjusting the stroboscopic frequency of the light source and the exposure time of the camera, the same object can be periodically imaged in a frame of image. Through image processing, the average distance of the periodic imaging can be obtained. The average imaging distance of objects with different distances is different, and the limit distance can be calculated by combining the running distance of train stroboscopic cycle and the camera focal length. On this basis, a ranging equipment is designed and tested on the test bench. The results show that the measurement error decreases when the flash frequency of the light source is increased, which provides the basis for the on-line experiment of the limit detection.
【作者单位】：中南大学交通运输工程学院轨道交通安全教育部重点实验室;
【基金】：高速铁路基础研究联合基金重点资助项目(U1134205) 中南大学教师研究基金资助项目(2013JSJJ013)
【分类号】：U298

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