抗背景光干扰的双波长激光脉冲相关检测方法

针对激光脉冲相关检测易受背景光干扰影响的问题,提出了一种抗背景光干扰的双波长激光脉冲相关检测电路设计方案。设计了四路视场相同的探测单元,分别在其前面加装中心波长不同的窄带滤光片。当其中一个工作波长的威胁激光出现时,对应波长的两路探测器的输出与威胁激光信号和背景光响应,而另外两路探测器的输出则仅作为背景光响应,将它们分别对应相减后再进行相关处理,从而抑制各单元间相关背景光的干扰,同时实现对双波长激光脉冲的相关检测。实验结果表明:电路在实现对背景光干扰有效抑制的同时还能实现对双波长激光脉冲的相关检测,证明了设计方案的可实施性与有效性。

Correlation detection of dual-wavelength laser pulse suppressing background light interference

To suppress background light interference in laser pulse correlation detection,a method of dual-wavelength laser pulse correlation detection was proposed.Four parallel detecting units with the same field of view was designed in this system.Narrow optical filters with different central wavelength were installed in front of them.Two of the parallel detectors received the threat laser and background light,while the others received only the background light.The background light interference was suppressed and the correlation detection of dual-wavelength laser pulse was achieved by subtracting background light from the mixed signal before correlation processing.Experiment results show that not only background light interference is suppressed effectively,but also dual-wavelength laser correlation detection is achieved.The method is proved to be feasible and effective.