重叠视场细分技术的研究

Study of the Fov Division Technique

在阵列式激光报警器中 ,相邻两光电二极管视场重叠 ,形成重叠视场。重叠视场、独立视场与光电二极管的数量决定着报警分辨率。本文提出重叠视场细分技术 ,把重叠视场与独立视场由原来相等变为三倍关系 ,当激光照射到重叠视场时 ,对两光电二极管接收到的能量进行比较 ,判断出两管能量是大于、还是小于、或是等于 ,从而把重叠视场细分成三个分视场 ,达到改善激光报警分辨率的目的。在光电二极管数量不变的情况下 ,该技术能使激光报警的分辨率成倍地提高。由此原理设计了一台激光报警装置 ,通过对激光报警装置进行的原理性接收实验 ,证明分辨率较原来提高了一倍 ,重叠视场细分技术是可行的 。

In an array laser warning, two adjacent photodiode field-of-views (FOV) overlap and form overlapped FOVs. The number of overlapped FOVs, independent FOVs and photodiodes determine the warning resolution. This paper introduces the FOV division technique by which the overlapped FOV becomes three times of the independent FOV instead of being equal to the independent FOV. When the laser beam reaches the overlapped FOV, we compare the energy received from two photodiodes and judge the energy relation between these two photodiodes, so the overlapped FOV is divided into three sub-FOVs and the laser warning resolution is improved. By using this method, the laser warning resolution can be double improved without changing the number of photodiodes. One laser warning device is developed based on this technique. The test results proved that the laser warning resolution is double improved and the FOV division technique is feasible.