光学系统弥散斑的测定法

• 作 者: 孔桃叶
• 出 处: 电光与控制
• 发表日期: 1987年03期
• 关键词: 光学系统 空间频率 点光源 传递函数 像面 散斑 等晕区 动态范围 透镜系统 低频成分

光学系统的评价标准多采用MTF(OTF)即用物空间频率对比传递函数来表示.MTF中,本来就含有对比度的概念,然而要测定对比度的绝对值实际上却很困难.在MTF测定中,以相对于足够低的频率的对比度做为标准,来表示对于各个空间频率的对比度传递的相对值.因此,要衡量光学系统,成象的对比度特性的优劣,除了MTF外,还要特别定义FL ARE或VELL-ING GLARE.

The evaluation criteria of the optical system mostly use the MTF (OTF) that is the spatial frequency of the object to express the contrast transfer function .MTF, originally contains the concept of contrast, but to determine the contrast of the absolute value is actually very difficult.In MTF determination, Contrast relative to sufficiently low frequencies is used as a criterion to represent the relative value of contrast transmission for each spatial frequency Therefore, to measure the optical system, the contrast characteristics of the imagery are best defined in addition to the MTF FL ARE or VELL-ING GLARE.