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Detector quantum efficiency: An important parameter for FT-IR spectroscopy

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Abstract

Spectral detectivities (D *(σ)) are commonly used to characterize the sensitivity of infrared detectors, but for most spectroscopic purposes they are very misleading.

For photon detectorsspectral detector quantum efficiencies (η q (σ)) are needed in order to calculate the (S/N) ratio for the photon-noise limited situation. An equation to calculate ηq(#x03C3;) fromD *(σ) values is presented. The results for some common IR-detectors are surprising.

As an application for the use ofη q (σ) values theS/N ratio of an FT-IR spectrum from an optimized FTS instrument under photon-limited conditions is given.

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References

  1. E. L. Dereniak, D. G. Crowe,Optical Radiation Detectors, Wiley, New York, 1984.

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  2. J. W. Brault, Fourier Transform Spectroscopy, in:High Resolution in Astronomy (A. Benz, M. Huber, M. Mayer, eds.), Genève Observatory, Sauverny, Switzerland, 1985.

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  3. P. R. Griffiths,Chemical Infrared Fourier Transform Spectroscopy, Wiley-Interscience, New York, 1975.

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Authors and Affiliations

  1. Physikalisch-Chemisches Institut der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-6300, Giessen, Germany

    Manfred Birk

  2. National Solar Observatory, 950 N. Cherry Avenue, 85726, Tucson, AZ, USA

    James Walter Brault

Authors
  1. Manfred Birk
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  2. James Walter Brault
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Birk, M., Walter Brault, J. Detector quantum efficiency: An important parameter for FT-IR spectroscopy. Mikrochim Acta 95, 243–247 (1988). https://doi.org/10.1007/BF01349762

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  • DOI: https://doi.org/10.1007/BF01349762

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