And this is where Fresnel comes in.

而这也就是菲涅尔的突破口。

It used to be called a Fresnel lens.

以前叫菲涅尔透镜。

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。

But Dr Koechlin does not worry about that, because his Fresnel telescope will be in space.

然而，凯什兰博士并不为此担心，因为他的菲涅尔望远镜将会在太空中。

A century and a half after Newton, and more than two after Galileo, a Frenchman called Augustin-Jean Fresnel worked out that you can do it using diffraction.

在牛顿利用星光的150年后，伽利略的透镜系统的两百多年后，一个名叫奥古斯丁.让.菲涅尔的法国人想到也可以利用衍射来达到目的。

(a special lens that also uses Fresnel optics, and a camera to record the image) must fly at the focus, the accuracy required is only hundredths of a metre, not billionths.

（也是一种运用菲涅尔视觉的特殊透镜，也是一种记录图像的相机）的卫星在焦点上运行，所需要的精准度也只是百分之一米。

Fresnel telescopes have not been developed in the past because the image formed by one that was large enough to rival a useful-sized reflecting telescope would be several kilometres from the zone plate.

过去，菲涅尔设计的望远镜还制造不出来，因为要想使衍射望远镜的大小和正常使用的反射望远镜大小相同，它所产生的图像就会距离波带片数千米远。

Looking at such an atmosphere, though, is tricky. Stars are so much brighter than the planets which orbit them that their light overwhelms the small amount reflected from a planet's surface. And this is where Fresnel comes in.

然而，观测到这样的大气层也是非常难的。恒星比以他们为轨道运行的行星亮得多。他们的光盖过了从行星表面上反射过来的少量光。而这也就是菲涅尔的突破口。

And although a second satellite containing the " eyepiece" (a special lens that also uses Fresnel optics, and a camera to record the image) must fly at the focus, the accuracy required is only hundredths of a metre, not billionths.

并且，尽管还必须有一个含有" 目镜" （也是一种运用菲涅尔视觉的特殊透镜，也是一种记录图像的相机）的卫星在焦点上运行，所需要的精准度也只是百分之一米。