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Compact Setup of a Tunable Heterodyne Spectrometer for Infrared Observations of Atmospheric Trace-Gases
Physikalisches Institut, University of Cologne, Zuelpicher Strasse 77, D-50937 Cologne, Germany
Rhenish Institute of Environmental Research, Department for Planetary Research, University of Cologne, Aachener Strasse 209, D-50931 Cologne, Germany
* Author to whom correspondence should be addressed.
Received: 29 April 2013; in revised form: 26 June 2013 / Accepted: 9 July 2013 / Published: 16 July 2013
Abstract: We report on the development and characterization of the new compact infrared heterodyne receiver, iChips (Infrared Compact Heterodyne Instrument for Planetary Science). It is specially designed for ground-based observations of the terrestrial atmosphere in the mid-infrared wavelength region. Mid-infrared room temperature quantum cascade lasers are implemented into a heterodyne system for the first time. Their tunability allows the instrument to operate in two different modes. The scanning mode covers a spectral range of few wavenumbers continuously with a resolution of approximately ν/∆ν ≥ 105. This mode allows the determination of the terrestrial atmospheric transmission. The staring mode, applied for observations of single molecular transition features, provides a spectral resolution of ν/∆ν ≥ 107 and a bandwidth of 1.4 GHz. To demonstrate the instrument's capabilities, initial observations in both modes were performed by measuring the terrestrial transmittance at 7.8 µm (∼ 1,285 cm−1) and by probing terrestrial ozone features at 8.6 µm (∼ 1,160 cm−1), respectively. The receivers characteristics and performance are described.
Keywords: heterodyne; infrared; spectroscopy; atmosphere; transmission; ultra-high resolution; ozone; trace gas; wind
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MDPI and ACS Style
Stangier, T.; Sonnabend, G.; Sornig, M. Compact Setup of a Tunable Heterodyne Spectrometer for Infrared Observations of Atmospheric Trace-Gases. Remote Sens. 2013, 5, 3397-3414.
Stangier T, Sonnabend G, Sornig M. Compact Setup of a Tunable Heterodyne Spectrometer for Infrared Observations of Atmospheric Trace-Gases. Remote Sensing. 2013; 5(7):3397-3414.
Stangier, Tobias; Sonnabend, Guido; Sornig, Manuela. 2013. "Compact Setup of a Tunable Heterodyne Spectrometer for Infrared Observations of Atmospheric Trace-Gases." Remote Sens. 5, no. 7: 3397-3414.