面阵光纤传像束与面阵CCD的像元耦合调制传递函数特性

发布时间：2018-04-30 16:46

本文选题：光纤光学 + 面阵光纤传像束　；参考：《光学学报》2017年05期

【摘要】：高分辨率成像光纤传像束制备工艺的进步使得传统高性能光电成像仪器具备柔性,并且使仪器的体积和重量大幅减小。面阵光纤传像束和面阵CCD间的像元耦合离散采样效应,导致了传统成像质量评价模型的局限性。从光强度呈余弦分布的光信号在面阵光纤传像束和面阵CCD中的传递过程出发,建立了耦合离散采样系统的耦合调制传递函数(Coupled-MTF)模型,研究了Coupled-MTF的收敛特性及其随像元耦合误差的变化规律等。研究表明,若输入信号的空间频率与奈奎斯特频率的偏差为1%,当阵列中包含的像元总数超过1000时,Coupled-MTF振荡收敛为固定值。输入信号的空间频率与奈奎斯特频率的偏差越小,Coupled-MTF振荡收敛的速度越慢。Coupled-MTF的振荡幅值在弧失和子午方向不同,且与各自方向的像元耦合误差有关。Coupled-MTF随面阵光纤传像束与面阵CCD间的像元耦合误差周期振荡,理论上振荡周期为包层直径。在奈奎斯特频率及其分频附近的频域,Coupled-MTF在给定空间频率处不为固定值。上述特性有别于传统空不变成像系统的调制传递函数。
[Abstract]:With the development of the fabrication technology of high resolution imaging optical fiber image transmission beam, the traditional high performance photoelectric imaging instrument is flexible, and the volume and weight of the instrument are greatly reduced. The discrete sampling effect of pixel coupling between plane fiber beam and plane array CCD leads to the limitation of traditional imaging quality evaluation model. The Coupled-MTF model of coupled discrete sampling system is established based on the cosine distribution of the optical signal in the plane array optical fiber image beam and the plane array CCD, and the Coupled-MTF model of the coupled discrete sampling system is established. The convergence characteristics of Coupled-MTF and its variation with pixel coupling error are studied. It is shown that if the spatial frequency of the input signal deviates from the Nyquist frequency, the Coupled-MTF oscillation converges to a fixed value when the total number of pixels contained in the array exceeds 1000. The smaller the deviation between the spatial frequency of input signal and the Nyquist frequency, the slower the convergent speed of Coupled-MTF oscillation is. The oscillation amplitude of Coupled-MTF is different in the direction of arc loss and meridian. Coupled-MTF oscillates periodically with the pixel coupling error between the optical fiber beam and the array CCD, and theoretically the oscillation period is cladding diameter. The Coupled-MTF in the frequency domain near the Nyquist frequency and its frequency division is not a fixed value at a given spatial frequency. The above characteristics are different from the modulation transfer function of the traditional space-invariant imaging system.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家自然科学基金(61675198,61307114)
【分类号】：TN253;TN386.5

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