用谱线的离散计数来测量谱线的强度

Q4 Chemistry
P.V. Vashchenkо, V. А. Labusov
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引用次数: 0

摘要

在原子发射光谱分析中,光电探测器阵列被广泛应用于光谱分析仪中。用这种类型的检测器获得的光谱是光电池输出信号的数字值的离散序列。定量测试样品中某种元素浓度的一种方法是测量其分析线的强度,方法是在这条线附近对光谱区域的几个计数进行积分,或者用线形轮廓近似光谱区域。通常,由于原子发射光谱与谱线的高度饱和,计算谱线强度的区域被限制在几次计数。在光谱线相对于光电探测器阵列的光电池漂移的情况下,这种限制导致强度测量误差,在集成中使用的计数数量越少,测量误差越大。本研究的目的是确定计算域的最佳尺寸,并开发一种计算线强度的最佳方法,以减少强度测量误差。为了模拟光谱线相对于光电池的漂移,我们模拟并记录了BLPP-2000和BLPP-4000光电探测器阵列中光谱线相对于光电池不同位置的一组空心阴极灯(Cu, Zn)光谱。BLPP-2000和BLPP-4000的谱线相对于前一个谱线的位移分别为2 μm和1 μm。结果表明,与逐步插值相比,线性插值显著降低了谱线漂移对两种阵列测量强度RMSD的影响。此外,通过选择最优积分范围可以进一步降低这种影响。在对所选光谱线进行线性插值时,BLPP-2000在1.6和3.1次积分范围内,相对于光电探测器阵列光电池的光谱漂移的最小测量误差分别为0.25和0.23%,BLPP-4000在1.0和2.7次积分范围内,光谱漂移的最小测量误差分别为0.4和0.28%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measuring the intensity of spectral lines from discrete counts of line spectra
In atomic emission spectrometry, photodetector arrays are widely used in spectrum analyzers. A spectrum obtained with detectors of this type is a discrete sequence of digital values of photocell output signals. One way to quantify the concentration of an element in a test sample is to measure the intensity of its analytical line by integrating a region of the spectrum over several counts in the vicinity of this line or by approximating a region of the spectrum with a line shape profile. As a rule, due to the high saturation of atomic emission spectra with spectral lines, the region for calculating the spectral line intensity is limited to several counts. In the case of spectral line drift relative to the photocells of photodetector arrays, this limitation leads to an intensity measurement error, which is the greater, the smaller the number of counts used in integration. The objectives of this study are to determine the optimal size of the computational domain and develop an optimal method for calculating the line intensity to reduce the intensity measurement error. To simulate the drift of spectral lines relative to photocells, we have simulated and recorded a set of spectra of a hollow cathode lamp (Cu, Zn) with different positions of spectral lines relative to the photocells of BLPP-2000 and BLPP-4000 photodetector arrays. In each next spectrum of the set, the spectral lines were shifted relative to those in the previous spectrum by 2 and 1 μm for BLPP-2000 and BLPP-4000, respectively. It has been shown that compared to stepwise interpolation, linear interpolation significantly reduces the effect of the drift of spectral lines on the RMSD of the measured intensities for both types of arrays. In addition, this effect can be further decreased by choosing an optimal range of integration. In the linear interpolation for the selected spectral lines, the minimum measurement error due to the spectrum drift relative to the photocells of photodetector arrays for BLPP-2000 is 0.25 and 0.23% for a range of integration of 1.6 and 3.1 counts, respectively, and for BLPP-4000, it is 0.4 and 0.28% for 1.0 and 2.7 counts, respectively.
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来源期刊
Analitika i Kontrol
Analitika i Kontrol Chemistry-Analytical Chemistry
CiteScore
0.90
自引率
0.00%
发文量
15
期刊介绍: Analitika i Kontrol is a scientific journal covering theoretical and applied aspects of analytical chemistry and analytical control, published since autumn 1997. Founder and publisher of the journal is the Ural Federal University named after the first President of Russia Boris Yeltsin (UrFU, Ekaterinburg).
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