摘要
在微脉冲激光雷达对能见度的测量系统中 ,常采用光子计数和模 /数 ( A/D)转换两种处理方法进行对比测量 ,但微脉冲激光器没有 Q开关 ,不能输出与激光脉冲同步的信号 ,来触发 A/D卡采集大气会波信号。本文以高频管和高速单稳触发电路解决了该问题 ,使整形后的 TTL信号的触发沿 (上升沿 )与激光脉冲的延时相差 5 0 ns,可将测量系统的盲区控制在 10
Photo counting method and analog to digital conversion method are often used to compare their results in visibility detection system with micropulse LASER, but there is no synchronous trigger pulse for A/D converter, which is normally generated with Q switch in micropulse LASER An effective method is represented herein, which are amplifying the voltage signal sensed by photodiode with high frequency transistor and changing it to TTL level with high speed monostabillity trigger, the total delay time is 50 ns or so, then measurement area can not be within only 10 m
出处
《现代电子技术》
2004年第13期87-88,共2页
Modern Electronics Technique
关键词
微脉冲激光探测
同步触发
雷达
A/D
micropulse laser detection
synchronous trigger
radar
A/D
