Dispersive far-infrared Fourier transform spectrometer

Christopher J. Chunnilall; William F. Sherman

doi:10.1117/12.166574

31 January 1994 Dispersive far-infrared Fourier transform spectrometer

Christopher J. Chunnilall, William F. Sherman

Proceedings Volume 2089, 9th International Conference on Fourier Transform Spectroscopy; (1994) https://doi.org/10.1117/12.166574
Event: Fourier Transform Spectroscopy: Ninth International Conference, 1993, Calgary, Canada

Abstract

Two Mercury Cadmium Telluride (MCT) detectors have been evaluated for open-path Fourier transform infrared (FT-IR) spectrometry. The first detector was equipped with a standard manufacturers preamplifier; the second detector was equipped with a `linearizing' preamplifier. The two detectors and their respective preamplification systems were evaluated at varied light levels and open-path distances. Chloroform was chosen as an analyte of comparison because it has absorption frequencies at 1220 and 772 cm^-1. These two frequencies allow for the visualization of non-linear absorption characteristics. Toluene monitored from a process stack also demonstrates this non-linearity. These data dramatically exhibit the need for a linear detection system in qualitative and quantitative infrared spectrometry.

Citation Download Citation

Christopher J. Chunnilall and William F. Sherman "Dispersive far-infrared Fourier transform spectrometer", Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); https://doi.org/10.1117/12.166574

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