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目前大多数工厂实驗室和科学研究机关进行发射光譜的定量分析工作仍然普遍使用照相方法。近十数年来,为了提高分析速度和精确度,发展光电方法是光譜分析重要工作之一。此方法的优点不仅仅在于加快分析速度和提高分析的精确度,而且可以大大簡化操作程序,便于自动化。G。A。Nahstoll桥路的缺点:一般地說來,由谱线光強作用而引起光电信增管的电流是很微弱的。要測量这个微弱的訊号往往先把它放大若干倍。然而在被分析元素含量較高的情况下,(例如1%以上)可以不必放大而通过一个桥式线路来进行测量。此时应当选擇較强的谱线作为分析线对。图一为C·A·Nahstoll等用來分析鎂合金中的铝的裝置。两个光电倍增管1P28分别接收分析线和内标线。由于这两条谱线光强不等,所以
Currently most of the factory laboratories and scientific research agencies to carry out quantitative analysis of emission spectra still commonly used photographic methods. In recent ten years, in order to improve the speed and accuracy of analysis, the development of optoelectronic methods is one of the important tasks of spectral analysis. The advantages of this method lie not only in the speeding up of the analysis and in the accuracy of the analysis, but also in greatly simplifying the procedure and making it easy to automate. G. A. Disadvantages of the Nahstoll Bridge: In general, the current caused by the surge in the optical power of the optical telecom is very weak. To measure this faint signal is often magnified a few times. However, when the content of the element to be analyzed is high (for example, 1% or more), it is possible to measure through a bridge without having to enlarge it. In this case, you should select the stronger spectral line as the analytical line pair. Figure 1 shows a device used by CA Nahstoll to analyze aluminum in magnesium alloys. Two photomultiplier tubes 1P28 respectively receive the analysis line and the internal standard line. Because of the unequal light intensity between these two lines,