文献类型：期刊文献

中文题名：优化的动态平均权重算法及其在色谱信号处理中的应用

英文题名：Optimized Data Weighted Averaging Algorithm for Chromatographic Signal Processing

作者：吴慧文[1];李钰[1];林兆培[1]

机构：[1]华东理工大学信息科学与工程学院,上海200237

年份：2014

卷号：40

期号：4

起止页码：469

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

语种：中文

中文关键词：色谱信号;失配整形;动态平均权重;条件选择

外文关键词：chromatography signal; mismatch shaping; data weighted averaging; condition selection

摘要：在液相色谱检测系统中,通常将朗伯-比尔定律计算得到的吸光度进行数模转换,再将转换结果以模拟信号的方式送入工作站进行分析。由于色谱信号大部分是直流信号,只有在出峰时信号频带才处于低频状态,导致基于动态平均权重算法(DWA)的多位量化调制器带入额外的谐波噪声,直接影响色谱信号的性能。本文提出了一种优化的DWA算法,可以更好地抑制谐波噪声,提高DAC性能。与常规DWA算法不同的是,本文算法加入了条件选择模块,通过控制每个选择周期的初始指针值,避免了谐波噪声的带入。仿真结果表明,该算法明显抑制了谐波噪声,有效提高了直流特性,从而更有利于对色谱信号进行处理。
In the liquid chromatography system, the absorbance values obtained by Lambert Beer＇s law will be transformed from digital to analog, which will be sent to the chromatography workstation for analysis. However, multi-bit sigma-delta modulators based on the data weighted averaging （DWA） lechnique are plagued by extra harmonic noise, which will affect the performance of chromatographic signals. This paper presents an optimized DWA algorithm, which can suppress harmonic noise and improve the DAC performance. Different from the conventional DWA method, a condition selected block is added in the proposed algorithm to control the initial pointer value in each selection cycle such that the harmonic noise can be avoided. The simulation results show that the harmonic noise can be significantly altenuated, and DC characteristics can be effectively raised such that the proposed algorithm is more benefit for the chromatographic signal processing.