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首页> 外文期刊>Review of Scientific Instruments >A New External Objective Aperture Centering and Interchanging Device for the RCA EMU Electron Microscope
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A New External Objective Aperture Centering and Interchanging Device for the RCA EMU Electron Microscope

机译：RCA EMU电子显微镜的新型外部物镜光圈定心和互换装置

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摘要

A device which quickly interchanges and centers up to seven objective apertures in the electron microscope has been described. It consists of a platinum‐iridium, aperture‐carrying tongue which may be moved longitudinally and laterally through a sylphon bellows arrangement. The interchanging and centering of an aperture takes only seconds since its position can be observed on the final viewing screen. It is believed that these apertures remain cleaner over a much longer time than in the usual aperture arrangement since they are retracted to a shielded position until actually used and only one of seven apertures is in the beam at any one time. With no aperture in place the entire specimen screen may be scanned at low magnification so that the search for suitable fields is simplified. Then the proper aperture for the degree of contrast desired is moved into place and exposures are made in the usual way. The device has greatly simplified the use of objective apertures in the electron microscope.
机译：已经描述了一种在电子显微镜中快速互换并对准多达七个物镜孔的装置。它由带有孔的铂铱金属制成，可以通过一个波纹管风箱装置纵向和横向移动。光圈的互换和居中仅需几秒钟，因为它的位置可以在最终观察屏幕上看到。可以相信，这些孔比通常的孔布置在更长的时间内保持清洁，因为它们被缩回到屏蔽位置直到被实际使用，并且在任何时候只有七个孔之一在光束中。在没有孔的情况下，可以以低放大倍数扫描整个样本屏幕，从而简化了对合适视野的搜索。然后将所需对比度的适当光圈移到适当位置，并以通常的方式进行曝光。该设备大大简化了电子显微镜中物镜孔径的使用。

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  • 来源
    《Review of Scientific Instruments》 |1953年第4期|共3页
  • 作者

    Bishop Francis W.;

  • 作者单位

    Atomic Energy Project, School of Medicine, University of California at Los Angeles, Los Angeles, California;

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  • 正文语种 eng
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