激光在火车控制中应用设计

Application of Laser Transmit Signal to Train Control Design

为解决火车经过道口时经常出现的安全问题,提出了利用激光作为控制信号载体,以大气为传输介质的自由空间激光传输控制系统。该系统克服了无线电波遥控系统的弊端,在实现对远距离运动目标的控制时,不受环境电磁波干扰。其控制信号的传输过程是先用控制信息对发端激光信号进行调制,接收端经光电转换、放大,还原控制信号后对目标进行控制。经电路安装调试,运行结果显示,在100 m距离内可完成对电源的通断控制,该研究成果可推广到其他远程控制的应用中。

In order to solve the safety problem often occured when trains pass by cross point, a transmit and control system is put forward which uses laser as a carrier of control signal and uses air as a transmit medium of the system. The defects of radio telecontrol are overcome, and the system is not affected by environmental electromagnetic wave disturbance when the long distance mobile object is controlled. The transmission procedure of the control signal is to modulate laser signal from sending terminal by control signal, then to change optical signal into electrical signal, and to amplify signal in receive terminal, finally to control the object after recovering control signal. The running result of the circuit shows that the system control of power on/off is achieved. The research efforts can be applied to other process control.