Taking and processing of the dark field diagram of a CCD in astronomy are discussed in this paper.

重点讨论了天文ccd器件暗场图像的拍摄与处理。

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Multiple dark field image can readily be used in revealing the relation between diffraction pattern and bright-and dark-field images.

多重暗场象可以快速揭示衍射花样同明场和暗场象之间的关系。

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Three experimental techniques were used: the simple optical probing, the dark field imaging and the visualization of inverse phase velocity surfaces.

所采用的实验方法有简单光探针技术，暗场法以及倒速度图显示等三种。

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The key to those sharper pics, it seems, is so-called "dark field microscopy, " a technique that, as NewScientist points out, is normally used by biologists.

ENGADGET: X-rays get boost from "dark field" technology

The deaf-mute helped my grandfather to his feet and led him to the door, where he could see the dark field swimming with shadows: the villagers, the snowdrifts, the fence.

NEWYORKER: The Tiger��s Wife

That's because as the Earth moves around the Sun, it is moving into a stationary field of dark matter - and for half the year it will be moving against the tide of dark matter - just like driving into the rain.

BBC: Dark Matter: Experiment to shed light on dark particles