Detector quantum efficiency: An important parameter for FT-IR spectroscopy |
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| Authors: | Manfred Birk James Walter Brault |
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| Institution: | (1) Physikalisch-Chemisches Institut der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-6300 Giessen, Germany;(2) National Solar Observatory, 950 N. Cherry Avenue, 85726 Tucson, AZ, USA |
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| Abstract: | Spectral detectivities (D
*( )) 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 (
q
()) are needed in order to calculate the (S/N) ratio for the photon-noise limited situation. An equation to calculate q(#x03C3;) fromD
*() values is presented. The results for some common IR-detectors are surprising.As an application for the use of
q
() values theS/N ratio of an FT-IR spectrum from an optimized FTS instrument under photon-limited conditions is given. |
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| Keywords: | spectral detectivities detector quantum efficiency S/N ratio FTS instrument |
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