新型高速列车实时追踪系统

介绍了利用光纤光栅(FBG)波长编码的特点,采用新型分布式FBG传感实现高速列车实时追踪。其主要结构是沿线等间距设置众多具有不同中心波长的FBG传感头,当列车车轮压上传感头时,中心波长发生偏移,偏移的次数就是列车的轴数,所有传感头所计轴数应该相同,如不相同说明有车厢脱节。从车轮到达每个传感头的时间间隔,可计算出列车的运行速度、加速度,如果在整个调度区间有多趟列车,则在调度中心可精确判断每趟列车所在的位置、行进的速度、加速度和每趟列车间的距离。

A New Type of High Speed Train Real-time Tracing System

By using the wavelength encoding characteristic of fiber Bragg grating(FBG),a new kind of distributed FBG pressure sensor was introduced to achieve the train real time tracing.It combined FBGs of different wavelengths in series,and the space between them is same.When the wheel of the train is on the sensor probe,the center wavelength of the FBG will be shifted,the shifts time of each sensor should be the same,otherwise,it will mean that the disjoint is occurring.With computer monitor,the position,velocity,acceleration,and disjoint of the train can be given by analyzing the pressure acting time duration of each sensor.If there are more trains in the area,the distances of them can also be obtained.