脉冲光源原子吸收光谱仪信号数字处理软件的设计  

The software design of digital processing for a radio-frequency powered hollow cathode lamp atomic absorption spectrometer

作　　者：徐进勇[1] 林延畅[2] 胡子文[1] 覃章健[2] 葛良全[2] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]成都理工大学核技术与自动化工学院,四川成都610059

出　　处：《计算机与应用化学》2007年第5期597-600,共4页Computers and Applied Chemistry

基　　金：国家自然科学基金(40374051);成都理工大学青年科学基金(2004QJ01)资助项目

摘　　要：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％。A W-coil atomic absorption spectrometer has been developed. A radio-frequency powered hollow cathode lamp has been used to improve detection limits. A composite signal included the analysis signal and the radio-frequency powered cathode lamp signal has been acquired. To extract the analysis signal from the composite signal, firstly, the differential of the composite signal has been worked out, each peak site and peak height of the radio-frequency signal is gained. Meanwhile, the absorption on each peak site is worked out. On the basis of the absorption of every peak site, the atomic absorption profile is drawn. Afterward, the absorption profile area and the integral absorption are calculated by the Simpson digital integral method. A set of Visual Basic program has been developed to achieve previous signal processing functions. The software can output both the graph and value of each experiment. Finally, the copper in standard solution has been determined, the results is listed as follows： the system detection limits is 0. 0133 μg/ml for Cu. The RSD for 1.0 μg/ml Cu is 4. 05% （n=10）.

关 键 词：脉冲空心阴极灯 钨丝原子吸收光谱 信号处理 辛普森数值积分 

分 类 号：O65[理学—分析化学] TP31[理学—化学]