| linlin911911 |
2011-11-10 13:02 |
一个优化到全局最小值的系统
MT<3OKo?:
今天，用CODE V做了一个Introduction to Lens Design With Practical ZEMAX examples chapter12的例子，顺便用CODE V全局优化运行了一下，运行15分钟后结束。得到的结论是，这本书采用的特殊优化步骤竟然真能绕过较大的极小值，到达了全局最小值。不可思议！当然了，可能更复杂的系统难以优化到最小值。 u4 3-\=1$T
Joseph M. Geary 只是平淡的说了下面一段话，却没提这是使用SF2玻璃下达到最全局最小值。SF2对应的成都玻璃是ZF1. 'h 7n}
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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