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为了降低激光告警系统的虚警率,提出了一种基于非扫描式F-P标准具结构的光学虚警抑制方法。该方法采用相干长度作为判据,因此可大大抑制背景辐射的干扰。通过计算机仿真验证了该方案的可行性。对该方案中的关键技术F-P标准具的设计进行了详细讨论,定性分析了F-P标准具结构参数对其工作性能的影响,并通过实验优选确定设计参数。结果表明,该方案结构简单,可有效排除非相干光的干扰,光学虚警率近乎为0,漏警率小于0.25%。
In order to reduce the false alarm rate of laser alarm system, an optical false alarm suppression method based on non-scanning F-P etalon structure is proposed. The method uses the coherence length as a criterion and therefore can greatly suppress background radiation interference. The feasibility of the scheme is verified by computer simulation. The design of the key technology F-P etalon in the scheme is discussed in detail. The influence of structural parameters of F-P etalon on its performance is analyzed qualitatively and the design parameters are determined through experiments. The results show that the proposed scheme is simple in structure and can effectively eliminate the interference of incoherent light. The false alarm rate is almost zero and the missed alarm rate is less than 0.25%.