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通过实验室设计的脉冲光源钨丝原子吸收光谱仪,采集到一个分析信号和光源载波叠加的复合信号。为了从中提取原子吸收分析信号,首先对该复合信号进行数值微分,确定光源脉冲载波每个峰的坐标和相应的峰高,算出每个载波峰位相应的吸光度值,绘制吸收峰轮廓图;然后根据辛普森(Simpson)数值积分原理,求出吸收峰的面积,从而得到积分吸光度值。在微软公司的Visual Basic 6．0开发平台上,编写了实现上述功能的软件,以图形和数值的方式,同时输出每次测定结果。该软件系统和钨丝原子吸收光谱仪硬件系统相配合,对铜标准溶液的测试结果为:检出限为0．0133μg/ml,线性范围为0．10- 4．0μg／ml,对1．0μg／ml Cu(n=10)测定的精密度为RSD=4．05％。
Through the pulsed light source tungsten atomic absorption spectrometer designed by laboratory, a composite signal of analyzing signal and light carrier superposition is collected. In order to extract the atomic absorption analysis signal, the differential value of the composite signal is first differentiated, the coordinates of each peak of the pulse source of the light source and the corresponding peak height are determined, the corresponding absorbance value of each carrier peak position is calculated, and the absorption peak contour map is drawn; According to the Simpson numerical integration principle, the area of the absorption peak is obtained, and the integral absorbance value is obtained. On the Visual Basic 6.0 development platform of Microsoft Corporation, software for realizing the above functions is compiled, and the results of each measurement are output in the form of graphs and numerical values at the same time. The software system is compatible with the tungsten atomic absorption spectrometer hardware system. The test results of the copper standard solution are as follows: the detection limit is 0.0133μg / ml, the linear range is 0.10-4.0μg / ml, and 1.0μg / Ml Cu (n = 10), the precision was determined as RSD = 4.05%.