| linlin911911 |
2011-11-10 13:02 |
一個優(yōu)化到全局最小值的系統(tǒng)
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今天，用CODE V做了一個Introduction to Lens Design With Practical ZEMAX examples chapter12的例子，順便用CODE V全局優(yōu)化運(yùn)行了一下，運(yùn)行15分鐘后結(jié)束。得到的結(jié)論是，這本書采用的特殊優(yōu)化步驟竟然真能繞過較大的極小值，到達(dá)了全局最小值。不可思議！當(dāng)然了，可能更復(fù)雜的系統(tǒng)難以優(yōu)化到最小值。 K *vt;L
Joseph M. Geary 只是平淡的說了下面一段話，卻沒提這是使用SF2玻璃下達(dá)到最全局最小值。SF2對應(yīng)的成都玻璃是ZF1. L2[($ l
Cautionary Note: In the above example we were able to get a good result by unslaving everything and making all curvatures and airspaces variable. Some- times, however, this will not work. You might have to do things in several separate stages before a good result is obtained. In other words, a direct path to the deep minima may be blocked by a shallower minima. Somehow you have to get around the latter first. Properly staged optimizations can navigate around such an obstacle.
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