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宽视场成像光谱仪采用线列光纤束进行视场折叠以改进其性能。作为一种特殊的光学元件,线列光纤除了具有传像功能外,还具有离散采样特性,这需要采用新方法评价其成像性能。以对比度传递函数的定义为基础,推导出线列光纤束的对比度传递函数解析表达式,据此研究了线列光纤传像束对比度传递函数的特性。结果表明,在极其靠近Nyquist频率及其分频的频域,对比度传递函数呈现出振荡现象,收敛速度与频率偏离量、光纤数相关,随着光纤数的增多呈现出明显的收敛趋势;在其他频域,当光纤数小于100时,对比度传递函数就收敛于平均值。对比度传递函数随初位置呈现出周期变化。
Wide field imaging spectrometers use field-line fiber bundles for field-of-view folding to improve their performance. As a special kind of optical element, in addition to the imaging function, the line-column fiber also has discrete sampling characteristics, which requires a new method to evaluate its imaging performance. Based on the definition of contrast transfer function, the analytical expression of the contrast transfer function of the line bundle is deduced, and the characteristics of the contrast transfer function of the line bundle are studied. The results show that the contrast transfer function shows oscillation phenomenon in the frequency domain close to the Nyquist frequency and its frequency division. The convergence rate is related to the frequency deviation and the number of optical fibers. With the increase of optical fiber number, In the frequency domain, when the number of optical fibers is less than 100, the contrast transfer function converges to the average value. The contrast transfer function shows a periodic change with the initial position.