zemax中Afocal Image Space选项的作用-无焦模式

2020-02-14 by:CAE仿真在线来源:互联网

在zamax中,该选项在系统设置里面或system exporter》》aperture里面进行控制。

Afocal Image Space

If this box is checked, OpticStudio will perform most analysis features in a manner appropriate for optical systems with output beams in image space that are nominally collimated. Strictly speaking, the term afocal means the optical beam is collimated in both object and image space. However, OpticStudio uses this term to describe collimated output in image space, whether the beam is collimated in object space or not. For brevity, the documentation uses the term “afocal mode” to indicate Afocal Image Space is checked on, and “focal mode” to indicate Afocal Image Space is checked off.

When using afocal mode, transverse, longitudinal, and MTF aberrations are computed in units appropriate to afocal systems. Transverse aberrations are computed as a function of angle relative to a reference ray rather than units of length. Longitudinal aberrations are computed as a function of defocus in diopters (inverse meters) rather than as defocus in units of length. MTF is measured in cycles per angle rather than cycles per length. The change of units is not always mentioned in the documentation for each individual analysis feature. When using afocal mode, the user should be aware that some analysis window settings described in focal units are actually in afocal units if afocal mode is on. Afocal aberrations may be measured in various units, with milliradians being the default.To change the afocal unit type, see “Afocal Mode Units” in the Units Section and see the section of System Explorer.

无焦点图像空间(无焦模式)

如果选中此框,则OpticStudio将以适合光学系统的方式执行大多数分析功能,这些光学系统的图像空间中的输出光束标称已校准。严格来说,术语“无焦点”是指光束在物体和图像空间中都是准直的。但是,OpticStudio使用此术语来描述图像空间中的准直输出,而不管光束是否在对象空间中准直。为简便起见,文档使用术语“远景模式”表示选中“焦点图像空间”,而使用“焦点模式”来表示选中“焦点图像空间”。

使用无焦点模式时,以适合于无焦点系统的单位计算横向,纵向和MTF像差。横向像差是相对于参考射线的角度而不是长度单位的函数。纵向像差是作为散焦度的函数(以米为单位)(而非米),而不是作为散焦的长度单位。 MTF以每个角度的周期数而不是每个长度的周期数来衡量。文档中并不总是针对每个分析功能都提到单位的变化。使用自动对焦模式时,用户应注意,如果打开了自动对焦模式,则焦点单位中描述的某些分析窗口设置实际上是以自动对焦单位为单位。可以使用多种单位来测量总像差,默认设置为毫弧度。要更改总焦类型,请参阅“单位”部分中的“ Afocal模式单位”,并参见“系统资源管理器”部分。

在一个激光扩束镜头系统的优化案例中,入射光和出射光相互平行,这个时候就需要无焦点限制。

这个限制不会限制你的镜头系统的设置,只会对优化过程和优化目标有影响。

有的同学说这个限制应该做在merit function里面,但实际上zemax把他当做一个系统设置项目。

其作用很可以通过下列两个效果图来对比: