Authors: Mehay, Aaron W.; Cai, Chunsheng; de B. Harrington, Peter

Source: Applied Spectroscopy, Volume 56, Issue 2, Pages 50A-69A and 145-274 (February 2002) , pp. 223-231(9)

Publisher: Society for Applied Spectroscopy

Abstract:

Wavelet compression (WC) coupled to a regularized version of linear discriminant analysis (LDA) was evaluated as an effective classifier for identification of benzene, toluene, ethyl benzene, and the xylene isomers (BTEX) from their positive ion mobility spectra. A novel LDA classifier was devised that uses pseudoinverses of the within-group covariance matrices. The pseudoinverse allows LDA to be applied directly to underdetermined data. Wavelet compression improved the classification by removing noise from the spectra. Spectra compressed with the daublet 22 filter yielded better prediction than data compressed by principal components. Ion mobility spectrometry (IMS) affords rapid and sensitive measurements that may be used for process monitoring. This study demonstrates that classification by LDA directly on the wavelet-compressed (WT-LDA) positive ion spectra can be used for identification of BTEX compounds. The accompanying benefits include fast model building, removal of noise, and improved classification. Benzene, toluene, ethyl benzene, and o-, m-, and p-xylene at high and low concentrations were used to construct the classification models. Spectra from intermediate concentrations were used for evaluation. Optimization of prediction favored shorter wavelet filters than those obtained from filters optimized for reconstruction.

Keywords: WAVELET COMPRESSION; LINEAR DISCRIMINANT ANALYSIS; PROCESS MONITORING; BTEX; ION MOBILITY SPECTROMETRY; SINGULAR VALUE DECOMPOSITION

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702021954485

Publication date: 2002-02-01

More about this publication?

• The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge.
  
  Previously published as Bulletin (Society for Applied Spectroscopy)
• Editorial Board
• Information for Authors
• Submit a Paper
• Subscribe to this Title
• Membership Information
• Request copyrighted SAS materials
• Spectroscopic Nomenclature
• Focus Compendium
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Analytical Chemistry
• By this author: Mehay, Aaron W. ;  Cai, Chunsheng ;  de B. Harrington, Peter

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers