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Proceedings Paper

GC/FT-IR: A Comparison of Single-beam and Optical Subtraction Approaches
Author(s): David E. Henry; Peter R. Griffiths
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Paper Abstract

Subnanogram detection limits have not been published for any on-line GC/FT-IR system which employs light-pipes. Several approaches aimed at achieving this goal provide (in theory) the means for improving the signal-to-noise ratio (SNR) of most current systems by more than an order of magnitude. While lower detection limits are possible, the practical detection limits of a single-beam GC/FT-IR measurement remain limited by the dynamic range of most affordable analog-to-digital converters (ADC's). In GC/FT-IR a very wide dynamic range is required since the amplitude modulation due to analyte absorption is extremely small in com-parison to the strong signal at the centerburst of the interferogram.

Paper Details

Date Published: 20 December 1985
PDF: 2 pages
Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); doi: 10.1117/12.970858
Show Author Affiliations
David E. Henry, University of California (United States)
Peter R. Griffiths, University of California (United States)

Published in SPIE Proceedings Vol. 0553:
Fourier and Computerized Infrared Spectroscopy
David G. Cameron; Jeannette G. Grasselli, Editor(s)

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