Application of image-intensifier for the development of the direct observation of weak images of electron-microscope

图像增强器在电子显微镜弱图像直接观察中的应用

基本信息

批准号：
59880006
负责人：
TOKONAMI Masayasu
金额：
$ 2.69万
依托单位：
Faculty of Science, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

Electron-microscopy has provided information on a wide variety of materials problems. With the availability of electron-microscopes with a high-resolution its field of application has been extended greatly.In recent years, "in situ" observation of various phenomena within the specimen holder has caught the interest of many investigators, where bright images with a high resolution are indispensable. Cases are also often met with, which we can obtain only considerably thick specimens. In each case, we need such a strong radiation of electron beam or a long exposure time to record pictures on conventional films as the specimens are in danger of being totally damaged. There are also another cases the specimen essentially suffer serious damage even by fairly weak irradiation. It was the purpose of the present investigation to develop a system suitable for obtaining bright images with high contrast using only a weak electron beam by containing a microchannel plate (MCP), the quality of which has been rapidly augmented, into the electron-microscope. A set of mount and flange has been specially designed in order to include the MCP into the electron-microscope. Furthermore, a high-sensitive TV camera, a video tape recorder and a personal computer have been arranged in line with the total planning. In the last result of the present investigation, we could reduce the total amount of the radiation of electron beam to around 1/50 compared with the conventional technique to record the same picture. The effect of the electron amplification of the MCP has brought a marked increase in the brightness and a distinct improvement in the resolution of the whole system. Hence our present purpose has been successfully achieved.

电子显微镜提供了有关各种材料问题的信息。随着高分辨率电子显微镜的出现，其应用领域已大大扩展。近年来，对样品架内各种现象的“原位”观察引起了许多研究人员的兴趣，其中明亮的图像与高分辨率是必不可少的。也经常遇到这样的情况，我们只能获得相当厚的标本。在每种情况下，我们都需要如此强烈的电子束辐射或较长的曝光时间才能在传统胶片上记录图片，因为样本有完全损坏的危险。还有另一种情况，即使在相当弱的照射下，样本也会受到严重损坏。本研究的目的是开发一种适合仅使用弱电子束获得具有高对比度的明亮图像的系统，该系统在电子显微镜中包含微通道板（MCP），其质量已迅速增强。为了将 MCP 纳入电子显微镜，专门设计了一套安装座和法兰。此外，根据总体规划还配备了高灵敏度电视摄像机、录像机和个人电脑。在本研究的最后结果中，与记录相同图像的传统技术相比，我们可以将电子束辐射总量减少到大约1/50。 MCP的电子放大效应带来了亮度的显着提升以及整个系统分辨率的明显提升。这样我们现在的目的就已经成功达到了。