Authors: Weakley, Andrew T.; Griffiths, Peter R.; Aston, D. Eric

Source: Applied Spectroscopy, Volume 66, Issue 5, Pages 132A-144A and 475-608 (May 2012) , pp. 519-529(11)

Publisher: Society for Applied Spectroscopy

Abstract:

A method of automated baseline correction has been developed and applied to Raman spectra with a low signal-to-noise ratio and surface-enhanced infrared absorption (SEIRA) spectra with bipolar bands. Baseline correction is initiated by dividing the raw spectrum into equally spaced segments in which regional minima are located. Following identification, the minima are used to generate an intermediate second-derivative spectrum where points are assigned as baseline if they reside within a locally defined threshold region. The threshold region is similar to a confidence interval encountered in statistics. To restrain baseline and band point discrimination to the local level, the calculation of the confidence region employs only a predefined number of already-accepted baseline minima as part of the sample set. Statistically based threshold criteria allow the procedure to make an unbiased assessment of baseline points regardless of the behavior of vibrational bands. Furthermore, the threshold region is adaptive in that it is further modified to consider abrupt changes in baseline. The present procedure is model-free insofar as it makes no assumption about the precise nature of the perturbing baseline nor requires treatment of spectra prior to execution.

Supplementary Data: 1 item

Keywords: Automated baseline correction; Surface-enhanced infrared absorption spectra; Raman spectra; Bipolar bands; Adaptive least-squares thresholding

Document Type: Research article

DOI: http://dx.doi.org/10.1366/110-06526

Affiliations: 1: Department of Chemical and Materials Engineering, University of Idaho, PO Box 441021, Moscow, Idaho 83844-1021, USA

Publication date: 2012-05-01

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: Weakley, Andrew T. ;  Griffiths, Peter R. ;  Aston, D. Eric

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