GC/FT-IR: A Comparison of Single-beam and Optical Subtraction Approaches

David E. Henry; Peter R. Griffiths

doi:10.1117/12.970858

20 December 1985 GC/FT-IR: A Comparison of Single-beam and Optical Subtraction Approaches

David E. Henry, Peter R. Griffiths

Proceedings Volume 0553, Fourier and Computerized Infrared Spectroscopy; (1985) https://doi.org/10.1117/12.970858
Event: 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, 1985, Ottawa, Canada

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.

Citation Download Citation

David E. Henry and Peter R. Griffiths "GC/FT-IR: A Comparison of Single-beam and Optical Subtraction Approaches", Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); https://doi.org/10.1117/12.970858

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