Elimination of the interference of bias light for laser warning systems
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摘要: 为了有效抑制周围环境背景光对光谱型非成像类脉冲激光告警器的干扰,在采取滤光、滤波、比较器阈值限制等方式进行背景光噪声消除后,针对近距离、大能量的背景闪光干扰情况,根据背景闪光与脉冲激光在时间长度上的相异性,采用高速可编程逻辑器件对告警器的入射光时间进行了计时并判断,对背景闪光干扰进行了消除。经过实际测试,应用该方法后,告警装置12h内由太阳光引起的虚警次数为0,采用多种方式模拟近距离、大能量背景闪光干扰,告警装置均无虚警情况出现。结果表明,该方案可为由背景光引起的激光告警装置虚警问题的解决提供较好的实例和实验方案,其时长判断方法仅通过一片复杂可编程逻辑器件即可实现,硬件电路集成度高、程序编写简单,具有较好的应用价值。Abstract: In order to effectively restrain the interference of bias light from the surrounding environment for the spectral nonimaging pulse laser alarm device,after eliminating the bias light noise through light filtering,circuit filtering,comparator's threshold restrictions,aiming at the existence of huge energy background flash interference,according to the difference of the time length between background flash and pulse laser,calculating the incident light time of the alarm device based on complex programmable logic device and doing a judgment,the background flash interference can be eliminated.During the actual test,the false-alarm number of the alarm device caused by sunlight was 0 in 12h,and no false alarm happened in various simulating close and huge energy background flash interference situation.The result shows that the project can provides a good example and experimental scheme for resolving the false alarm problem cause by bias light of a laser warning device,the circuit hardware is highly integrated for judging time with only one complex programmable logic device chip,its program is short,and the method has good application value.
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