凝视激光探测系统的探测灵敏度测试方法

Test method of detection sensitivity of starring laser detecting systems

为了研究凝视激光探测系统的探测灵敏度指标性能,针对凝视激光探测系统的凝视成像特性及探测面元接收激光能量会随视场角的变化而改变的特点,从实验室现有测试条件出发,设计了一套关于其探测灵敏度的室内间接测试方法。分析了测试过程中各环节应注意的问题,给出了相应解决方法,对搭建的模拟激光探测系统在不同的方位角下进行了激光发射、探测实验测试,得出7个不同方位角的探测灵敏度结果,其中,中心视场角探测灵敏度为0.259nJ/cm^2,相对误差在3.4%～4.2%范围内,得出该系统最小可探测能量随视场角增大而增大的规律,并定性分析了测试误差。结果表明,该设计方法实际可行,误差精度可以达到规程要求,为进一步研究设计高精度的灵敏度测试系统提供了有益参考。

In order to study the detection sensitivity of a starring laser detecting system, considering the features of the starring laser detecting system and the fact that the detected laser energy varying with different view field angle, based on the available measure condition in laboratory, an indirect method was presented to test the detection sensitivity in laboratory. Probable problems in each part of the design were analyzed, and their resolution methods were put forward accordingly. Based on the experimental setup ,experiments were carried out and the detection sensitivity was obtained at seven view angles, the detection sensitivity in center view field reaches 0. 259nJ/cm2 with a relative deviation of 3.4% - 4.2%. The measurement error was also theoretically analyzed. The test results confirm that the method is feasible and practical, and the accuracy meets the requirement. This method is useful for the design of high precision test systems.