The problem is the word exactly.
而问题就出在精准上。
It means just that.
它就如字面意思一样,
The formation would have to fly with a precision of a few billionths of a metre.
要精准到十亿分之一米。
Using a zone plate instead of a mirror gets around this.
用波带片代替镜面在轨道运行。
Because the plate is flat, it can be made of plastic and folded up for launch.
因为波带片表面是平的,他可以用塑料制作而成,然后折叠起来发射。
Size thus ceases to be an issue.
而尺寸大小就不再是问题。
And although a second satellite containing the eyepiecemust fly at the focus,the accuracyrequired is only hundredths of a metre, not billionths.
并且,尽管还必须有一个含有目镜的卫星在焦点上运行,所需要的精准度也只是百分之一米。
That, Dr Koechlin reckons, gives Fresnel optics a big advantage over Newtonian ones.
凯什兰博士认为,这将是菲涅尔视觉超越牛顿的设计的一大优点。
To test the idea, he and an international consortium of his colleagues have built aground-based prototype.
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