通过短波红外探测器灵敏度、目标和环境探测输出信噪比、对比度等分析，计算给出不同大气能见度、环境照度条件下，短波红外热像对外界景物和激光光斑的探测距离，并对理论分析进行试验验证。结果表明，在大气能见度1 km~3 km、环境照度1 lx~1 000 lx、阈值信噪比2.25~10、阈值对比度0.01~0.02的条件下，短波红外热像对激光光斑探测距离为0 km~3.5 km。

Through the analysis on the sensitivity of short-wave infrared(SWIR) detectors, the signal-to-noise ratio(SNR) of the target and the environmental detection output and the contrast, the detecting distances of SWIR thermal image to external scenes and laser spots under different atmospheric visibility and ambient illumination conditions were calculated and theoretically analyzed, moreover, the theoretical analysis was verified by testing.The results show that the detection distance of the laser spot by the SWIR thermal image is less than 3.5 km in the conditions of atmospheric visibility 1 km~3 km, ambient illumination 1 lx~1 000 lx, threshold SNR 2.25~10, and threshold contrast ratio 0.01~0.02.