Two-dimensional nonlinear wavelet compression of ion mobility spectra of chemical warfare agent simulants
Two-dimensional nonlinear wavelet compression of ion mobility spectra of chemical warfare agent simulants
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DOI：
10.1021/ac035488b
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发表时间：
2004-05-15
影响因子：
7.4
通讯作者：
Liu, C
中科院分区：
文献类型：
--
作者：
Cao, LB;Harrington, PD;Liu, C
离子迁移率光谱仪(IMS)提供了可用于监测和远程测量的小型化手持设备。由于此类仪器对无线传输的存储容量或带宽有限制，因此数据压缩非常重要。此外，所有仪器都应以尽可能快的采样率运行，因为可以通过小波压缩实现信噪比增益。线性小波压缩(LWC)应用于IMS数据，在重建光谱时会引起峰值失真。非线性小波压缩(NLWC)精确地保持了波峰的位置(即漂移时间)、高度和形状。从离子径迹Itemiser和Graseby离子探测器CAM上收集了三种化学战模拟剂二甲基甲基膦酸二甲酯、磷酸三乙酯和二丙二醇单甲醚的IMS数据。利用二维NLWC对化学战模拟器的IMS数据在漂移时间和数据采集维度上进行压缩。采用NLWC实现了1/128的压缩系数，其均方根相对误差为
Ion mobility spectrometry (IMS) affords miniaturized hand-held devices that can be used for monitoring and remote measurement. Because such instruments have limits on storage capacity or bandwidth for wireless transmission, data compression is important. Furthermore, all instruments should be operated with the fastest possible sampling rates because a signal-to-noise gain can be achieved by wavelet compression. linear wavelet compression (LWC) applied to IMS data may cause peak distortion when the spectra are reconstructed. Nonlinear wavelet compression (NLWC) precisely preserves the peak location (i.e., drift time), height, and shape. IMS data of three chemical warfare simulants, dimethyl methylphosphonate, triethyl phosphate, and dipropyleneglycol monomethyl ether, were collected from an Ion Track ITEMISER and a Graseby Ionics detector CAM. Two-dimensional NLWC was used to compress the IMS data in the drift time and data acquisition dimensions on IMS data of chemical warfare simulants. NLWC was applied to achieve a compression factor of 1/128 with relative error of root-mean-square of