希望大家帮帮忙！关于zemax 的一些问题

有几个问题想请教下大家，真的很急
1：为什么可用用paraxial理想透镜做优化？它的功能把平行光线汇聚于一点矫正像差的吧，但为什么可以用来做准直呢？而且thickness和focal length的数值要一样才可以？
2：在网上找到一篇用zemax做简单的准直优化的文章，是一个非序列透镜，材质是pmma，做成反光杯的模样，当做一个tir透镜，但是这样不会有光线漏掉吗？他并没有介绍要镀膜或怎么样
不知道为什么不能上传图片和附件，那篇文章叫做《用zemax设计简易led准直镜》
再次感谢！

hopebox

2012-05-31 21:35

paraxial surface/lens can be optimized so that you know the power of a real lens you will need to use.

for your second question, if rays' incedent angle is less than the critical angle then you would experience lost. the information you provided is not sufficient so it would be hard to make a comment about the actual design concept though. If reflecting thin film was applied you would make use of the ideal coating in ZEMAX to have a quick glance on the performance .

e_solo

2012-05-31 23:30

hopebox:paraxial surface/lens can be optimized so that you know the power of a real lens you will need to use. (J8(_MF
for your second question, if rays' incedent angle is less than the critical angle then you would experience lost. the information you provided is not s .. (2012-05-31 21:35) GU'/-6-T

非常感谢您，第一个问题我只想知道原因，还是说理想透镜就是用来做准直的？不是这样的吧？
第二个问题，我想贴图，但是网页总是出现错误信息，贴不上。如果是临界角的话，应该可以看到光线射出吧？但是看不到这个现象
第三，希望您能解答一下NSRA操作数的用法，我知道是追迹非序列模式光线用的，但是在设置操作数时，里面的splt，upol是什么意思？还有seg#和dat#读取的是什么数据类型？为什么可以用来优化准直光线？
如果可以的话，您用中文最好，我怕理解出现偏差

e_solo	2012-06-01 15:29
大家帮帮忙吧，nsra的操作数那个设置项功能网上实在查不到了...

hopebox

2012-06-01 16:21

I think in the file you saw, paraxial lens was there to simplfiy the design at the very early stage; just to have some idea about what sort of lens power is required to collimate. In reality, you will need to substitute the real lens later on.

For your second question, you shall check your light source illumination angle and see if majority of the rays hitting at the surface is beyond the critical angle. You may also zoom in the layout to see if some rays do emerge from this surface/lens cos in ZEMAX, if there is no objects ahead of the direction where the rays are travelling to then ZEMAX will normally terminate the ray tracing.

Not usre of the lens or the surface has any coating assigned, if so, you better tick the option of "Use Polarization" and "Split Ray" in order to see some effects that are only accounted under polarization analysis.

"Splt" means having the ray split at interfaces between materials of different index and Upol implies use polarization. You will need to use both settings if rays are partially reflected and transmitted.

When rays are split at an interface into reflected and trasmitted parts, these parts are referred as Segments so it depends on which segments you wish to look at and you may specifiy under seg# field. dat# refers to different data returned, you should check against the user manual for details as there are plenty information. However, you should be aware that NSRA only trace one single ray. To optimize you will need to use NSTR. For illumination wise you will probably find the returned data from the detetctor using NSDD more useful. Under NSDD you could set Pix# = -4 and Data = 1 in order to achieve collimation.

My apologies, from my end it is easier to type English instead.

kimclps

2012-06-01 16:22

如果不用理想透鏡，那準直系統(afocal system)性能的評價就只能採用以往"角像差"的方式。

使用理想透鏡的好處是在虛像的系統後方加入一個不引進像差的鏡頭，使最終像變成實像；
如此一來，實像的性能評價方式例如MTF等都得以進行，又可以在像差圖上對應以往角像差
表示方式的量，有它方便之處。

richardwu	2012-07-10 18:18
zhegewentijiandan

查看本帖完整版本: [-- 希望大家帮帮忙！关于zemax 的一些问题 --] [-- top --]