热成像系统前置栅网结构的衍射效应分析

The diffraction effect in a thermal imaging system with a front wire grid

针对热像仪前置栅网后产生的伪图像,以经典光学理论为基础,利用光的波动性质分析了栅网的前置对热成像影响的衍射作用机理,并且对非单色光目标情况也做了研究分析,进而建立了基于该成像机理下的数学模型.结果表明,当代入实际状态时的各项参数并用MATLAB对该模型进行图像仿真后,所得仿真图像与实际当中的伪图像相比较,取得了很好的相似性,达到了模型对这种现象进行描述的预期目的,并提出了需要进一步研究的问题和关键技术.

According to the affected images generated by the thermal imaging system which incorporates a front wire grid, with the help of classical optical theory, we analyzed the diffractive functional principle character of light wave, and also analyzed the case of non-concolorous targets, and further established the mathematic model. The results indicated that after putting in parameters of real instance and generating simulated images using MATLAB, the simulated images have good comparability with the images obtained in reality. The research achieved the expected aim of the modelling. Finally we put forward the questions and key technology pending further research.