系统采用FPGA作为数据采集触发信号源，实现了精确定时的数据采集，同时对采集的数据进行分析和处理。
FPGA is used as trigger source. The data acquisition of precise timing has been realized with edge-trigger manner. Meanwhile, the data analysis is also realized in the system.
同时，将触发信号源结构、工作原理、差动光电接收电路、微珠玻璃原向反射器的工作原理也进行了详尽的论述和介绍。
Structure and operating principle of the trigger signal source and of differential photoelectric receiving circuit and scotchlite retroreflector are detailed as well.
实验结果表明触发信号源无框架装置有效作用区大，抗干扰能力强，不受环境照明条件的影响，具有非接触、可全天候工作、性能稳定可靠、使用灵活方便等特点。
The experiment result indicates that the frameless equipment has the advantages of large effective screen area, strong anti-disturbance, noncontact, full-time working, reliable and flexible in using.
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