| 摘要 |
A spectroscopic gas sensor is disclosed, which has at least: an IR radiation source for emitting IR radiation, a measuring volume to be completely or partially filled with an air supply volume, in particular an exhaled air, a detector unit having at least one, preferably two detector elements for detecting the IR radiation passing through the measuring volume in at least one first wavelength range and outputting measuring signals, and an analyzer unit for recording the measuring signals and ascertaining a concentration of a measured substance in the air supply volume. A first detector element measures IR radiation in a wavelength range of an absorption band of the measured substance, and the analyzer unit ascertains a concentration of the measured substance in the air supply volume from the ascertained concentrations of the measured substance and a further component in the measuring volume. For this purpose, a second detector means measures the concentration of the further component of the air supply volume, preferably as a second spectroscopic detector element.
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