ISSTT Proceedings

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TELIS: TErahertz and subMMW LImb Sounder – Project Summary After First Successful Flight

Authors:
M. Birk, G. Wagner, G. de Lange, A. de Lange, B. N. Ellison, M. R. Harman, A. Murk, H. Oelhaf, G. Maucher, C. Sartorius
Abstract:
The TELIS instrument is a balloon-borne cryogenic three-channel heterodyne spectrometer for limb sounding of stratospheric trace gases. The instrument is flown on the MIPAS gondola together with the MIPAS-B Fourier-transform spectrometer of the Institute of Meteorology and Climate Research (IMK) of the Karlsruhe Institute of Technology (KIT). The MIPAS gondola is equipped with a precise GPS-aided inertial navigation system providing attitude and heading data of the gondola movements with 128 Hz that are also used as input for the TELIS pointing system. TELIS was developed by a European consortium involving research institutions, universities and industrial partners. Thermal emission radiation is coupled in by a 26×13 cm dual offset Cassegrain telescope controlled to maintain constant tangent height during measurement. Radiometric calibration is achieved by a blackbody and deep space view. The radiation is divided into three channels by means of a polarizer and a dichroic. Within a special lightweight cryostat three complete heterodyne receivers are kept at liquid helium temperature: THZ channel, 1750-1890 GHz, hot electron bolometer mixer, DLR; SIR channel, 480-650 GHz, integrated receiver, SIS mixer, SRON (see poster 'TELIS instrument performance analysis'); subMMW channel, 497-504 GHz, SIS mixer, RAL. A digital autocorrelator spectrometer with 4 GHz bandwidth and ca. 2 MHz resolution serves as backend shared among the channels.
Categories:
Observations
Year:
2010
Session:
8
Full-text:
Download a PDF of this paper.
Page Number(s):
195-200