基于MRTD和MTF的热成像系统综合性能评价方法的对比

在最小可分率温差(MRTD)信道宽度的热成像和调制传递函数(MTF)信道宽度的光电成像系统性能评价方法的基础上,通过实际热成像系统性能的理论模拟和实际观测试验,对比分析了两种方法对于评价热成像系统综合性能的一致性及系统主要参数变化对匹配效率的影响. 两种方法描述的系统最佳放大率与实际情况一致,且基于MRTD信道宽度的热成像系统性能评价方法与实际观察具有更好的一致性,适合热成像系统综合性能的评价. 结果表明,该方法对于研究光电成像系统的优化设计具有理论意义.

Comparison of General Performance Evaluation Methods for Thermal Imaging Systems Based on the Channel Width of Minimum Resolvable Temperature Difference and Modulating Transfer Functions

Based on minimum resolvable temperature difference(MRTD) channel width of thermal imaging systems and modulating transfer function(MTF) channel width of photoelectronic imaging systems,a comparative research between the evaluation methods for the general performance of thermal imaging systems is studied through simulation and experiments for an actual thermal imaging system.Good agreement was drawn between the two methods for the general performance valuation of thermal imaging systems.Some main system parameters were analyzed on their influence for the evaluation methods,indicating that the optimal angular magnification described by the two evaluation methods were consistent with the actual systems,and that the evaluation method based on MRTD channel width has a better agreement with actual viewing which is thus more suitable for evaluating thermal imaging systems.The comparative result is of significance for developing evaluation theory of photoelectronic imaging systems,and can provide direction more promisingly for the design of practical systems.