摘要
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。
Fiber-optic image bundles are used by the wide view field,hyperspectal imager to fold view field in order to improve its performance.As a special optical element,the fiber-optic image bundles not only have the function of image transmission,but also have discrete sampling characteristics.Therefore,these require a new method to evaluate the image quality of fiber bundles.According to the definition of contrast,the contrast transfer function of fiber-optic image bundles is deduced.Accordingly,the characteristics of contrast transfer function of fiber-optic image bundles are studied.The simulation results show that the contrast transfer function shows a convergence characteristic at the domain very close to the Nyquist frequency and Nyquist frequency division.The convergence rate associates with the frequency deviation and the number of fibers in bundles.The contrast transfer function shows a clear convergence trend with the increase of fiber number,and converges to the average value at other frequency domain when fiber number is less than 100.In addition,contrast transfer function cycles oscillation with the change of initial position.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2011年第7期81-85,共5页
Acta Optica Sinica
基金
国家863计划(2006AA12Z143)
国家自然科学基金(60538020)资助课题
关键词
光纤光学
线列光纤传像束
对比度传递函数
fiber optics
fiber-optic image bundles
contrast transfer function
