A large-area blackbody for in-flight calibration of an infrared interferometer deployed on board a long-duration balloon for stratospheric research
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Published:2018-08-14
Issue:8
Volume:11
Page:4757-4762
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Olschewski Friedhelm,Monte Christian,Adibekyan Albert,Reiniger Max,Gutschwager Berndt,Hollandt Joerg,Koppmann Ralf
Abstract
Abstract. The deployment of the imaging Fourier Transform Spectrometer
GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere) on
board a long-duration balloon for stratospheric research requires a blackbody
for in-flight calibration in order to provide traceability to the
International Temperature Scale (ITS-90) to ensure comparability with the
results of other experiments and over time. GLORIA, which has been deployed
onboard various research aircraft such as the Russian M55 Geophysica or the
German HALO in the past, shall also be used for detailed atmospheric
measurements in the stratosphere up to 40 km altitude. The instrument
uses a two-dimensional detector array and an imaging optics with a large
aperture diameter of 36 mm and an opening angle of
4.07∘ × 4.07∘ for infrared limb observations. To
overfill the field of view (FOV) of the instrument, a large-area blackbody
radiation sources (125 mm × 125 mm) is required for
in-flight calibration. In order to meet the requirements regarding the scientific goals of the
GLORIA missions, the radiance temperature of the blackbody calibration source
has to be determined to better than 100 mK and the spatial
temperature uniformity shall be better than 150 mK. As electrical
resources on board a stratospheric balloon are very limited, the latent heat
of the phase change of a eutectic material is utilized for temperature
stabilization of the calibration source, such that the blackbody has a
constant temperature of about −32 ∘C corresponding to a
typical temperature observed in the stratosphere. The Institute for Atmospheric and Environmental Research at the University of
Wuppertal designed and manufactured a prototype of the large-area blackbody
for in-flight calibration of an infrared interferometer deployed on board a
long-duration balloon for stratospheric research. This newly developed
calibration source was tested under lab conditions as well as in a climatic
and environmental test chamber in order to verify its performance especially
under flight conditions. At the PTB (Physikalisch-Technische Bundesanstalt), the
German national metrology institute, the spatial radiance distribution of the
blackbody was determined and traceability to the International Temperature
Scale (ITS-90) has been assured. In this paper the design and performance of
the balloon-borne blackbody (BBB) is presented.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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