论文部分内容阅读
目前穆斯堡尔谱学已广泛地应用于化学、固体物理、生物、冶金、地质等学科,成为探索物质精细结构的方法之一。我们于1975年利用原有的AИ-100道脉冲幅度分析器等设备制成了一台电磁驱动等加速穆斯堡尔谱仪,其后又改装了国产FH-427型256道脉冲幅度分析器用于穆斯堡尔谱仪。在此基础上,我们对改装的线路作了进一步的改进,使所用晶体管的数目由原来的大约40个减少到一半左右。道址进位时计数关门的死时间由18μs减少到12μs。同时把作为计数脉冲成形用的单稳态由2.5μs减小到1μs,因此新线路容许的最高计数率可提高一倍多。这点在使用强源时是很重要的。改装后的256道分析器兼有幅度分析和多定标测量两种用途,备有琴键开关,可进行这两种工作方式的转换。所设计的用于穆斯堡尔谱仪的多定标工作方式的改装逻辑图示于图1。经使用,线路工作正常。图中实线方框表示256道分析器原有控制线路单元,虚线方框表示加进去的线路单元。各具体电路都采用分析器中已有的单元电路结构形式。
At present, Mossbauer spectroscopy has been widely used in chemistry, solid physics, biology, metallurgy, geology and other disciplines, as one of the methods to explore the fine structure of matter. In 1975 we used the original AИ-100 channel pulse amplitude analyzer and other equipment made of an electromagnetic drive and other accelerated Mossbauer spectrometer, and later modified domestic FH-427 type 256 pulse amplitude analyzer At Mossbauer spectrometer. On this basis, we have made further improvements to the modified circuit, reducing the number of transistors used from about 40 to about half. The countdown of the track entry when the carry-on time is reduced from 18μs to 12μs. At the same time as the count pulse forming monostable from 2.5μs to 1μs, so the new line allows the maximum count rate can be more than doubled. This is important when using strong sources. Modified 256 analyzer both amplitude analysis and multi-standard measurement of two purposes, with a key switch, you can carry out the conversion of these two modes of work. The modified logic diagram of the multi-calibration working method designed for Mossbauer spectrometer is shown in FIG. 1. Used, the line is working properly. The solid square box in the figure shows the original control circuit unit of 256 analyzers, and the dashed square box indicates the added circuit unit. Each specific circuit uses the existing unit circuit structure in the analyzer.