Journal article
Calibration transfer algorithm for automated qualitative analysis by passive Fourier transform infrared spectrometry
Analytical chemistry (Washington), Vol.72(7), pp.1690-1698
2000
DOI: 10.1021/ac9907888
PMID: 10763270
Abstract
The automated qualitative analysis of passive Fourier transform infrared (FT-IR) remote sensing data is made difficult by the presence in the data of background and instrument-specific variation. For data collected with a single instrument, variation in the data arises from changes in the infrared background radiance, changes in the atmospheric composition within the field- of-view of the spectrometer, and changes in the instrument response function arising from temperature variation in the spectrometer. When more than one spectrometer is used, the variation in detector responses and phase signatures between instruments serves to complicate further the task of implementing an automated processing algorithm for detecting the signature of a target compound. In this work, a combination of signal processing and pattern recognition methodology is applied directly to the interferogram data collected by the FT-IR spectrometer to implement an automated compound detection procedure that is independent of background and instrument-specific variation. The key to this algorithm is the use of highly attenuating digital filters to isolate in the interferogram the frequencies associated with an analyte absorption or emission band while suppressing information at other frequencies. For the test compounds, acetone and sulfur hexafluoride, it is demonstrated that when this digital filtering procedure is coupled with either piecewise linear discriminant analysis or a back-propagation neural network, an automated detection algorithm can be developed with data from a primary instrument and then subsequently used to predict the presence of analyte signatures in data collected with a secondary spectrometer. Correct classification rates in excess of 92% are obtained for both compounds when the algorithm is applied to data collected with the secondary instrument.
Details
- Title: Subtitle
- Calibration transfer algorithm for automated qualitative analysis by passive Fourier transform infrared spectrometry
- Creators
- Frederick W Koehler - Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry, Clippinger Laboratories, Ohio University, Athens, Ohio 45701-2979, United StatesGary W Small - Center for Intelligent Chemical Instrumentation, Department of Chemistry and Biochemistry, Clippinger Laboratories, Ohio University, Athens, Ohio 45701-2979, United StatesRoger J Combs - U.S. Army, SBCCOM, Edgewood Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010-5424, United StatesRobert B Knapp - U.S. Army, SBCCOM, Edgewood Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010-5424, United StatesRobert T Kroutil - U.S. Army, SBCCOM, Edgewood Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010-5424, United States
- Resource Type
- Journal article
- Publication Details
- Analytical chemistry (Washington), Vol.72(7), pp.1690-1698
- Publisher
- American Chemical Society
- DOI
- 10.1021/ac9907888
- PMID
- 10763270
- ISSN
- 0003-2700
- eISSN
- 1520-6882
- Language
- English
- Date published
- 2000
- Academic Unit
- Chemistry
- Record Identifier
- 9984216687202771
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