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化学离子迁移谱检测仪是对化学毒剂、有毒有害气体等化学物质进行痕量检测和分析的一种有效的快速现场检测仪器。介绍了其组成结构和工作原理及其信号的产生,针对该检测仪中的信号经常存在的噪声污染问题,分析了IMS信号的特性,介绍了几种降噪方法的基本原理及其在信号降噪中的应用,通过计算机仿真对实际采集的IMS信号进行了降噪处理。仿真结果表明,这些降噪方法都能在一定程度上对IMS信号进行了降噪,相对来说,小波分析方法是一种更为有效的降噪方法,这为实现对IMS信号的快速有效识别奠定了基础。
Chemical ion mobility spectrometry detector is an effective and rapid on-site detection instrument for trace detection and analysis of chemical agents, toxic and harmful gases and other chemical substances. The composition, working principle and signal generation are introduced. According to the problem of noise pollution in the detector, the characteristics of the IMS signal are analyzed. The basic principles of several noise reduction methods and their application in signal degradation The application of noise, through the computer simulation of the actual acquisition of the IMS signal has been noise reduction. The simulation results show that these methods can reduce the noise of IMS signals to some extent. In contrast, the wavelet analysis method is a more effective noise reduction method, which can realize the fast and effective identification of IMS signals Foundation.