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Remote Sens. 2013, 5(7), 3397-3414; doi:10.3390/rs5073397
Article

Compact Setup of a Tunable Heterodyne Spectrometer for Infrared Observations of Atmospheric Trace-Gases

1,* , 1
 and 2
Received: 29 April 2013 / Revised: 26 June 2013 / Accepted: 9 July 2013 / Published: 16 July 2013
(This article belongs to the Special Issue Optical Remote Sensing of the Atmosphere)
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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 heterodyne; infrared; spectroscopy; atmosphere; transmission; ultra-high resolution; ozone; trace gas; wind
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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