中型石英攝谱仪加装光电直讀设备及分析铝合金的初步工作报告

叙述在中型石英摄谱仪上加装光电记录。并用以分析铝合金中的铜含量。给出线路的详细描。写利用分析线对Cu2247?及Al2660?及铜含量范围在2.3—6.7％中的一组标准试样。获得谱线强度比的直读数与含量之间成直线关系的工作线。光电光谱分析的平均相对误差为4％。光谱分析与化学分析结果之间的差异为1％。

PHOTO-ELECTRIC DIRECT-READING ATTACHMENT TO A MEDIUM QUARTZ SPECTROGRAPH AND ANALYSIS OF COPPER IN Al-ALLOY

Two movable photo-multiplier tubes are set in the position of the plate holder of a medium quartz spectrograph. The photo-current of each is amplified by an AC amplifier, and, after rectification, is used to charge a condenser. A thyratron is connected parallel to the condenser for the internal standard line (Al 2660?). At a present value of the voltage of this condenser, the thyratron operates so as to switch off the reading instrument which is connected with the other condenser for the analysis line (Cu 2247?). The final reading on the meter is proved to be proportional to the ratio of intensities of the two spectral lines.With the help of a set of standard samples, calibration curve for analysis of copper in Al-alloy is obtained. It is a straight lino in the concentration interval 2.3-6.7%. Beproducibility of the whole instrument including the light source is measured by repeating ten times the calibration process, each time determining the content of Cu in a given sample. The mean relative error of those ten determinations is 4%. The results of spectroscopic determination and chemical analysis have a deviation of 1%.