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由晶体单色器和西曼-波林相机组成的几尼叶(Guinier)聚焦相机,具有敏锐的衍射线条和高的分辨本领,在曝光时间不变的情况下,能得到较低的背景,使检测灵敏度大大提高。目前使用较多的有半聚焦的NONIUS Ⅰ型、Ⅱ型和全聚焦的SEIFERT双筒相机、XDC-700型以及NONIUS-552型(Ⅳ型)。本文主要就这些相机在结构和使用上的差别进行比较。 NONIUS Ⅰ、Ⅱ型相机是采用近似对数螺线单色器的半聚焦相机,其最大优点是采用同一块单色晶片,通过适当地调节能适用
A Guinier focus camera, consisting of a crystal monochromator and a Seaman-Pollin camera, with sharp diffraction lines and high resolving power, provides a low background with constant exposure time, The detection sensitivity is greatly improved. Currently used are more semi-focused NONIUS Type I, Type II and Full Focus SEIFERT binoculars, XDC-700 and NONIUS-552 (Type IV). This article mainly compares the differences in the structure and use of these cameras. NONIUS Ⅰ and Ⅱ cameras are half-focus cameras with an approximate logarithmic spiral monochromator. Its biggest advantage is that it uses the same monochromatic chip and can be properly adjusted