热成像系统噪声等效温差测试算法及工程应用

An NETD Test Algorithm for Thermal Imaging Systems and Its Engineering Application

针对热成像系统噪声等效温差的检测需求,基于三维噪声模型阐述了热成像系统噪声的4个时间分量、3个空间分量,分析了噪声常规计算方法。在此基础上,提出了一种基于标准差的简便算法,提高检测效率。进行了测试系统工程化设计,阐述了NETD指标的计算方法和测试流程。开展了实验研究,对两种三维噪声测试算法进行了验证与分析,与进口设备进行了对比测试。结果表明,本测试系统NETD指标检测重复性好、准确度高,应用于多型热成像设备性能检测,满足工程化保障需求。

In order to satisfy the demand of NETD test for thermal imaging systemsfour time components and three space components of noise of thermal imaging systems are discussed based on the 3D noise modeland the conventional noise computation method is analyzed.On which basisa simple algorithm based on standard deviation is put forwardwhich can reduce the amount of computation and enhance test efficiency.The engineering test system is designedand the calculation method and test process of NETD index are presented.Through experimenttwo test algorithms for 3D noise are verified and analyzed.A comparison test with the imported equipment is conductedand it is proved that the NETD test result of the proposed system is accurate and repeatable.It has been applied to the performance test of several kinds of thermal imaging equipmentwhich meets the requirement of engineering support.