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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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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A lot of submicro copper particles give a golden scattering light with slight pink hue in the dark field of optical microscope and a greyish red colour in visual observation.

无数的亚显微铜粒在暗场显微镜下呈金黄色散射并略带微红色调，肉眼观察则呈灰红色。

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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

"The 16 January kidnapping and murder of foreign oil workers at the In Amenas gas field has cast a dark cloud over the outlook for the country's energy sector, " it said.

BBC: Algeria oil industry: 'Dark cloud' over production

In the pristine white of the field hospital, the miners' dark journey seems a lifetime ago.

CNN: Chilean miners waited for death