| jessen |
2019-05-17 23:05 |
如何快速設計變焦鏡頭--來自Don的回復
打算設計一個復雜的變焦鏡頭，于是我參考Don的書《Lens Design Automatic and quasi-autonomous computational methods andtechniques》取其中第四十二章：A zoom lens from scratch 打開例子文件（我一般喜歡用online tutorial的代碼或者書中代碼修改，進行修改為： @RoZd?
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然后開始運行SYNOPSYS開始查找初始結構，發(fā)現速度并不快。優(yōu)化了半小時后，覺得有問題，但是又找不出毛病，于是發(fā)郵件給Don請求幫助。 Jx e+LG
半小時后得到回復（晚上十點發(fā)的，正好美國的上班時間），原文如下： W$c@C02<
The user is making a big mistake.He is asking for 14 elements, and that means 2**14 cases, or 16384 in all. Each additional element doubles the running time. A'|!O:s
Irecommend asking for groups of two instead of three elements to start with,which makes only 1024 cases. Then, when you optimize the best one, useAEI to see where you need more elements. This will run 16x faster. A typical run on ZSEARCH takes 20 minutes,and then the AEI runs improve the lens in a deterministic way. The whole job can usually be done in about two hours. +<7Oj s>o
That'sthe smart way to use the code.（經典） L)sg W(@2
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The example you senthas other errors. It only asks for four zooms, which is not enough. And it puts the stop on surface 17, which is appropriate for 10 elements butnot 14. You want the stop at the last group. { O U|'
I ran this job with 10 elements, and ZSEARCH took only 12.3minutes. With 10 zooms it will take longer, but probably less than 1/2 hour. {D +mr[ %
Please study the ZSEARCH examples in the online tutorial. Chapters 38 and 47. This is a superb feature -- but it has to be usedintelligently. bNea5u##
根據郵件回復，重新使用online tutorial的案例，進行初始結構查找，然后使用AEI的功能，大約在2個小時后得到想要的答案。 YlHP:ZW-cu
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總結：軟件是一個工具，怎樣高效的使用軟件，始終是一門藝術，需要有設計的經驗，也需要合理且正確地使用軟件。 `%C
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