摘要
讨论了一种基于变换域的离子迁移谱(IMS)信号处理方法—傅立叶变换离子迁移谱(FT-IMS)技术,通过离子门开关频率的改变实现信号的调制,得到频域的IMS信号。该技术使离子利用率由百分之一提高到了百分之二十五,信噪比(SNR)提高了14 dB以上;通过增加离子门开关频率的范围可以进一步提高分辨率,解决了IMS技术中SNR和分辨率相矛盾的问题。在此基础上,改进了FT-IMS算法,减弱了FT-IMS技术中镜像脉冲的干扰。经对FT-IMS算法和改进算法的数值仿真验证,证明了其有效性。
Fourier transform ion this paper. The potential of this mobility spectrometry （FT-IMS） is discussed in method, in which 25% of the available ions contribute to the measured signal, is evaluated with respect to sensitivity and resolution. Based on the study and discussion on the FT-IMS technology, an improved algorithm is presented, which has ruduced interference due to minor contributions. Finally, the validities of the method and its improvement are demonstrated from numerical simulation.
出处
《电波科学学报》
EI
CSCD
北大核心
2009年第4期709-713,共5页
Chinese Journal of Radio Science
关键词
离子迁移谱
傅立叶变换
分辨率
信噪比
ion mobility spectrometry（IMS）
Fourier transform
resolution
signal to noise ratio（SNR）
