【摘要】 根据光幕靶测速原理,针对实际测试中可能出现的冲击波和蚊虫干扰,本文设计了一种抗冲击波和蚊虫干扰的数字滤波电路.文中对弹丸、冲击波以及蚊虫穿过光幕时产生的波形信号进行详细分析,发现三者穿过光幕面时产生的波形信号宽度不同,以此宽度可以区分是弹丸信号还是干扰信号.根据分析结果,设计了一种采用数字计数器实现的抗冲击波和蚊虫干扰电路,给出了设计的详细电路,并对其工作原理进行了说明.更多还原

【Abstract】 Some problems of shock wave and flying insects ect on light screen are discussed.Based on the principle of the light screen, the different width of pulses generated by the objects with different speed crossing the light screen is studied. According to this characterestics, the circuit ofdigital counter to filter interferential signals caused by shock wave and insects is designed.更多还原