CAJ | 학술논문

针对编码掩模红外成像系统提出了一种建模方法.该模型将成像系统视为由两个功能部分组成,一部分为编码掩模与理想聚焦透镜的理想成像,另一部分为实际透镜自身的非理想成像.据此,系统点扩散函数可以由掩模结构的衍射模式和实际透镜的点扩散函数联合表示.此外,文中对视场内倾斜入射平面波的成像结果进行分析,从而得到了视场内的点扩散函数的变动情况.由码型及相应点扩散函数的指标评价结果可以看出,文中提出的基于Dammann阵列的码型结构对直接成像和图像还原处理具有较为平衡的性能.实验表明,对于编码掩模直接成像系统的码型中应当具有较多的随机性结构,而对于能够做进一步图像还原处理的系统码型中应当具有较多的周期性结构.
침대편마엄모홍외성상계통제출료일충건모방법.해모형장성상계통시위유량개공능부분조성,일부분위편마엄모여이상취초투경적이상성상,령일부분위실제투경자신적비이상성상.거차,계통점확산함수가이유엄모결구적연사모식화실제투경적점확산함수연합표시.차외,문중대시장내경사입사평면파적성상결과진행분석,종이득도료시장내적점확산함수적변동정황.유마형급상응점확산함수적지표평개결과가이간출,문중제출적기우Dammann진렬적마형결구대직접성상화도상환원처리구유교위평형적성능.실험표명,대우편마엄모직접성상계통적마형중응당구유교다적수궤성결구,이대우능구주진일보도상환원처리적계통마형중응당구유교다적주기성결구.
The model for infrared coded mask imaging systems was presented. It was composed with two functional components, the coded mask imaging with ideal focused lenses and the imperfection of practical lenses. The system's point spread function (PSF) can then be represented by the diffraction pattern of the mask and the PSF of the practical lenses. The imaging results with inclined plane waves were also analyzed to achieve the variation of PSF within the view field. According to indices for mask pattern evaluation and system's PSF assessment, mask pattern we proposed based on Dammann grating had a balanced performance for direct imaging and imaging reconstruction. Experiment shows that mask pattern for direct imaging should have more random structures, while more periodic structures in system with image reconstruction.