自适应光学的时域部分校正

Partial correction in temporal domain of adaptive optics

导出闭环伺服系统采用ＲＣ滤波器的自适应光学望远镜的带宽表达式，对风速不随高度变化及赝风速度在所有高度上都超过自然风速这两种重要的特殊情况，讨论了系统带宽与校正后剩余波前方差或斯特列尔比（ＳＲ）之间的关系。结果表明，对前一种情况，几十至一百Ｈｚ的带宽已足够；而对后一种情况，也许需要数百乃至上千Ｈｚ的带宽。

The bandwidth requiremente for an adaptive optics system with R-C filter as servo re-sponse has been derived.The relationship of this bandwidth to Strehl Ratio(SR )has been presented in two cases of the constant wind speed and the constant pseudo-wind speed which predominates over the natural winds at all altitudes. It has been found that a bandwidth of hundred Hz is more than enough for the former while thousands of Hz may be needed for the latter.