基于不同静态性能模型的热成像系统视距估算

Visual range prediction for thermal imaging system by different static performance models

基于NVL75,FLIR92和CFLIR国内外3种不同的热成像系统静态性能模型,采用静态性能参量MRTD建立对面目标的视距估算方程,并通过CFLIR40软件计算,比较不同模型下视距估算结果,得出:凝视型热成像系统在CFLIR模型下计算得到的MRTD值比FLIR92模型计算得到的MRTD值更接近实际测量值;在基本参数相同的条件下,利用MRTD估算的凝视系统的视距远远优于扫描系统的视距;对凝视型系统,从视距估算的结果来看,CFLIR模型略优于FLIR92模型。

The static performance models are important in thermal imaging technologies. In this paper, the equations of operating range are set up for the extended source object by minimum resolved temperature difference (MRTD) based on different static performance models such as NVL75, FLIR92 and CFLIR. At last, the visual range prediction simulation results with different models are compared. And the results show that for the infrared staring system, the MRTD value based on the CFLIR model is close to measurement value in the laboratory and the CFLIR model is superior to the FLIR92 model in the visual range prediction. On the other hand, judging by MRTD, the visual range prediction of the staring system is superior to that of the scan system when the parameters are equal.