Two-Dimensional Nonlinear Wavelet Compression of Ion Mobility Spectra of Chemical Warfare Agent Simulants

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• 作者：Libo Cao ; Peter de B. Harrington ; and Chang Liu
• 刊名：Analytical Chemistry
• 出版年：2004
• 出版时间：May 15, 2004
• 年：2004
• 卷：76
• 期：10
• 页码：2859 - 2868
• 全文大小：213K
• 年卷期：v.76,no.10(May 15, 2004)
• ISSN：1520-6882

文摘

Ion mobility spectrometry (IMS) affords miniaturizedhand-held devices that can be used for monitoring andremote measurement. Because such instruments havelimits on storage capacity or bandwidth for wirelesstransmission, data compression is important. Furthermore, all instruments should be operated with the fastestpossible sampling rates because a signal-to-noise gain canbe achieved by wavelet compression. Linear waveletcompression (LWC) applied to IMS data may cause peakdistortion when the spectra are reconstructed. Nonlinearwavelet compression (NLWC) precisely preserves thepeak location (i.e., drift time), height, and shape. IMS dataof three chemical warfare simulants, dimethyl methylphosphonate, triethyl phosphate, and dipropyleneglycolmonomethyl ether, were collected from an Ion TrackITEMISER and a Graseby Ionics detector CAM. Two-dimensional NLWC was used to compress the IMS datain the drift time and data acquisition dimensions on IMSdata of chemical warfare simulants. NLWC was appliedto achieve a compression factor of 1/128 with relativeerror of root-mean-square of <0.25% in the reconstructedspectra. A method was also developed and evaluated foroptimizing compression.