The portable FTIR (Fourier transform infrared) spectrometer EM27/SUN,
dedicated to the precise and accurate observation of column-averaged
abundances of methane and carbon dioxide, has been equipped with a second
detector channel, which allows the detection of additional species,
especially carbon monoxide. This allows an improved characterisation of
observed carbon dioxide enhancements and makes the extended spectrometer
especially suitable as a validation tool of ESA's Sentinel 5 Precursor
mission, as it now covers the same spectral region as used by the infrared
channel of the TROPOMI (TROPOspheric Monitoring Instrument) sensor. The
extension presented here does not rely on a dichroic, but instead a fraction
of the solar beam is decoupled near the aperture stop of the spectrometer
using a small plane mirror. This approach allows maintaining the
camera-controlled solar tracker set-up, which is referenced to the field stop
in front of the primary detector. Moreover, the upgrade of existing
instruments can be performed without alterating the optical set-up of the
primary channel and resulting changes of the instrumental characteristics of
the original instrument
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