Radiometric performance of the 530 to 625 GHz receiver unit of the submillimetre wave instrument on juice
Paper in proceedings, 2019

The upcoming Submillimeter Wave Instrument on the JUICE spacecraft is a passive radiometer/spectrometer instrument with two heterodyne receivers which are independently tunable in the frequency bands 530 to 625 GHz and 1080 to 1275 GHz. It will study Jupiter’s atmosphere as well as the atmospheres and surface properties of the Galilean moons. This work presents the results of first radiometric tests with a prototype of the 600 GHz receiver. In this context, the baseline ripples caused by the internal calibration target have been characterized using two conical prototypes with a linear and an exponential absorber coating profile. A significant reduction of the baseline ripple amplitude has been measured with the target having the exponential cone profile. The spectroscopic baseline has been characterized for various frequency steps when applying frequency switching as an alternative calibration mode. At some operating frequencies a very flat switching baseline has been measured for frequency throws up to 90 MHz, while at other frequencies significant spectral distortions are measured even with a step size of 22.5 MHz. The first radiometric tests of the sideband gain ratio with a passive Fourier Transform Spectroscopy method demonstrate the general applicability in the 530 to 625 GHz band.

Author

Karl Jacob

University of Bern

M. Kotiranta

University of Bern

Peter Sobis

Omnisys Instruments

Anders Emrich

Omnisys Instruments

Vladimir Drakinskiy

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Jan Stake

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

A. Maestrini

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

J. Treuttel

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

B. Thomas

RPG Radiometer Physics GmbH

M. Philipp

RPG Radiometer Physics GmbH

P. Hartogh

Max Planck Society

Axel Murk

University of Bern

ISSTT 2019 - 30th International Symposium on Space Terahertz Technology, Proceedings Book

28-31

2019 30th International Symposium on Space Terahertz Technology, ISSTT 2019
Gothenburg, Sweden,

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4/30/2020